Timothy Grant Leighton (born 16 October 1963)[1][2] is a British scientist who was a Professor of Ultrasonics and Underwater Acoustics at the University of Southampton.[5][6][7][8][9][10] He is the inventor-in-chief of Sloan Water Technology Ltd.,[11] a company founded around his inventions. He is an academician of three national academies.[12] Trained in physics and theoretical physics, he works across physical, medical, biological, social and ocean sciences, fluid dynamics and engineering. He joined the Institute of Sound and Vibration Research (ISVR) at the University of Southampton in 1992 as a lecturer in underwater acoustics, and completed the monograph The Acoustic Bubble[2] in the same year. He was awarded a personal chair at the age of 35 and has authored over 400 publications.[6][13][14]
He joined the Institute of Sound and Vibration Research (ISVR) at the University of Southampton in 1992 as a lecturer in underwater acoustics, and completed the monograph The Acoustic Bubble[2] in the same year. He was awarded a personal chair at the age of 35.
Research
He founded and leads two research organisations he founded (Global-NAMRIP and HEFUA), is the executive general director and inventor-in-chief of Sloan Water Technology Ltd.,[11] and talks extensively to schoolchildren, the public,[19] and on radio and video.[20]
...We need to work with rigour, imagination, and wonder, unconstrained by the artificial boundaries set in place by discipline names, or the history of projects in which we have previously worked, or the tendency of sponsors to believe they can pick winners, or above all by the belief that we must jump to solutions when we have not yet perceived the real problem. Then, when we eventually do find a solution, we must have the will to push it through all the way to help others, and not simply publish in the expectation that someone will finish the job for us.[13]
He worked as part of the team investigating whether man-made sounds can adversely affect benthic species (marine life that inhabits the seabed).[50][51] Such species have been overlooked in studies on how man-made sounds affect whales, dolphins and fish: benthic species find it far harder to relocate away from adverse sounds than do these other more mobile species. Furthermore, benthic species play a key role in the health of the marine sediment, turning it over and preventing it stagnating, and are key to the health of coastal marine environments.[32][52]
With other teams he developed methods to assess which fish species are most at-risk from man-made noise in the oceans,[53] and quantified such noise from shipping.[54] Turning the problem on its head, he worked with other teams on how to use sound as 'underwater acoustic scarecrows' to guide fish away from regions of man-made danger. These might occurs, for example, where industry exacts cooling water from rivers used as migration paths of endangered species (the young of European eel are slim enough for the flow to pull them through grills placed over such extraction points).[55][56][57][58][59][60][61][62] (key collaborator: Paul White[63]).
NAMRIP and Global-NAMRIP
The Global Network for AntiMicrobial Resistance and Infection Prevention (Global-NAMRIP),[21] is a multidisciplinary research team of hundreds researchers and end users, across four continents, including engineers, chemists, microbiologists, environmental scientists, veterinary and human medics, clinicians who contribute to international and national antibiotic guidelines for specified conditions, experts in food, ethics and law, crucially networked with economists, geographers, health scientists and experts from other social science disciplines to provide a truly joined up approach to antimicrobial resistance (AMR) and infection prevention (offsetting the loss of diversity in pharmaceutical industry research teams). As Leighton said at NAMRIP's 2016 conference:
...Unless preventative measures are found (and no-one in the world currently knows what those will be), AMR will (through the colloquial 'rise of superbugs') by 2050 be killing more people than cancer, and cost the world economy more than the current size of the global economy. We will not be able to feed the world unless we wean our food production industry off its dependence on antibiotics; common medical procedures (minor surgery, childbirth) will become significantly more hazardous; and advances in treatments (such as those for childhood leukaemia) will become reversed.
Global-NAMRIP was set up to search for such solutions and mitigations, with particular emphasis to finding alternatives to the oft-cited route of simply funding drug companies to produce more antibiotics. According to the New Scientist,:[48]
...I looked at all this and realised that even if there was a billion-dollar fund for new antibiotics, it would not sort out the problem; it might just buy us an extra decade. We need a new approach – a step change like the one antibiotics gave us when they first came in.[48]
...In many parts of the world, climate change and flooding, war, corruption, politics, received wisdom, traditions and religious practices, and the supply of fuel and money, play a far greater role in food, water, waste treatment, healthcare and the transport of microbes from one host to another, than do the outputs of the drug companies. The twin potential catastrophes are global, and so are the causes. The solutions lie with scientists and engineers to develop new technologies and embed new practices in the public and workforce; they lie with farmers, plumbers, office workers, water and sewage workers, medical practitioners, food retailers, innovators in business … indeed most of us. And they lie with those who are responsible for shaping behaviour across the world – not just the pharmaceutical companies.[47]
Global-NAMRIP creates new research teams,[64] commissions new research,[65] engaging with industry[66] to roll out solutions to society, and engaging with the public and policymakers to conduct outreach, education and dialogue.[67] The award-winning Public Engagement[67] and Policymaker Engagement[68] programmes that Leighton devised and leads have been mentioned in Parliament by the Under-Secretary of State for Health on 16 November 2017.[69][70] and Leighton has addressed the Parliamentary and Scientific Committee on his approach to addressing the threat of AMR.[71][72]
Global-NAMRIP particularly supports Low/Middle Income Countries with not-for-profit interventions,[22] for example with initiatives in urban[73] and rural Ghana (infection being the primary cause of death in rural Ghana).[74] In Uganda in 2019, Global-NAMRIP members from Uganda, Liberia, Malawi, Kenya, Ghana, Ethiopia and the UK met to compare, for the first time, the national AMR strategies of their respective countries, to share best practice. The meeting also produced significant impact in education, support for young innovators, and responded to a request from the Ugandan Minister for Health to write for him the 'Kampala Declaration on AMR'.[75]
Health Effects of Ultrasound in Air
In 2015, Leighton founded the research group Health Effects of Ultrasound in Air (HEFUA).[76][77][78] His aim was to map the increasing use of ultrasound in public places, and to investigate whether or not this increase is having adverse effects on some humans (following an investigation which revealed that the use of ultrasound in public places is increasing, and that guidelines were inadequate prior to the 2016 report).
His 2016 report[38] that first raised the issues was, in the first 2 years, downloaded over 20,000 times from the Royal Society website, leading to requests for a follow-up,[39] a journal special issue,[79][80][81][82][83][84][85] and numerous conference sessions worldwide as the importance of this topic was realised.[86][87][88] Scientists, engineers and the public around the world are now logging the location and type of device that emits ultrasound.[89][83] Leighton became an acknowledged world expert[90] on such public exposures, and on the claims of 'sonic attacks' on US Embassy staff in Cuba and China.[80][91][92][93][94][95] His expertise on the effect on humans of ultrasound in air provided the scientific basis that was cited by Giles Watling MP (Clacton, Conservative) in the Motion for leave to bring in a Bill (Standing Order No. 23) on "Anti-loitering Devices (Regulation)" (17 July 2018 Volume 645, 2.06 pm).[96][97]
In 2018, Leighton published an editorial that identified flaws in the way the statistical analysis was conducted on those identified as victims of the claimed attacks, which set up the tests in such a way that even unexposed people would, for the most part, be identified as suffering adverse health effects from the exposure.[80] In 2023, the US Office of the Director of National Intelligence (ODNI) agreed with this assessment, stating ‘that initial medical studies that led experts to believe that the AHIs [anomalous health incidents] “represented a novel medical syndrome or consistent pattern of injuries” suffered from “methodological limitations”’. Consequently, it reported that an inter-agency intelligence analysis from 7 agencies concluded that 5 considered it ‘very unlikely’ (one judging it ‘unlikely’, and one abstaining from an opinion) that a foreign adversary had deployed a weapon in the attacks.[98]
He currently serves on the Scientific Expert Group of the International Commission on Non-Ionizing Radiation Protection [99] to support appropriate protections for people (particularly children) exposed to airborne ultrasound.
Extraterrestrial acoustics
Since the mid-2000s, Leighton attempted to increase interest in using sound to explore other planets by predicting the soundscapes of other worlds[100][36][101][102][103] and how these could best be exploited using acoustic devices, led to devices for planetaria to use when teaching about other worlds,[36][101][37][34] and showed how careful calculation was needed to avoid mistakes when using acoustic sensors on other worlds.[35][104][105][106][107] With Professor Petculescu of the University of Louisiana at Lafayette, Leighton co-hosted three special sessions and a journal special issue of the Acoustical Society of America on acoustics in extraterrestrial environments (in 2007, 2008, 2016[34] and 2023[108]). Leighton was invited to the International Space Science Institute to support the Mars Perseverance and Ingenuity missions.[109][110][111]
Marine mammal acoustics
Leighton's explanation of how humpback whales use sound when feeding in bubble nets is now a staple explanation on whale tour boats.[112][113][114][115] He explained how dolphins can echolocate while producing bubble nets to hunt, a process that should blind their sonar.[10][116][112]
solutions for needle-free injectors for migraine sufferers (over 1 million sold).[126][130][131][132][133]
and assisted the Institute of Cancer Research with technology for tumour therapy monitoring (2010).[134]
Two billion people have been scanned in the womb under the guidelines he helped co-author for the World Federation for Ultrasound in Medicine and Biology guidelines for foetal ultrasonic scanning.[23][135]
Comparison of standard sonar and TWIPS in finding a target in bubbly water. Adapted from
Humanitarian
Leighton invented:
radar for the detection of buried explosives, hidden bugging devices, and for the location of buried catastrophe victims (in avalanches, mudslides, collapsed buildings etc.)[10]
the world's only sonar system capable of detecting objects in bubbly water (key, for example, to protecting services, cargo and aid shipping in conflict zones).[40][116][138] - mine detection is often an ongoing problem long after conflict has reduced and civilians return to former conflict zones (key collaborator: Paul White[63])
and, in collaboration with the National Oceanography Centre, one sold by Kongsberg[145][146][147][148] for archaeological and civil engineering purposes. Various collaborations are looking at ways of providing clean water from waste in Low- and Middle-Income Countries,[149] including mentorships of young entrepreneurs in Africa.[150]
Methodology by which active (red) and passive (yellow) sonar can be used to detect and quantify leaks from natural seeps or carbon capture and storage Facilities, taken from ref.
Environmental and Safety
Leighton:
devised and conducted the experiment that revealed that the amount of carbon dioxide dissolving into the oceans was much greater than the values previously used in predicting climate change and ocean acidification;[151]
invented technology used by environmental agencies and oil and gas companies to monitor for undersea gas leaks[24] from pipelines, and from methane seeps, by their acoustic emissions.
devised the theory and methodology[24] by which sonar could be used to monitor and quantify gas leaks from carbon capture and storage facilities in the seabed. This was later included as part of large-scale multinational trials on the North Sea seabed and elsewhere to assess leakage[25][26][152][153][154][155][156][157][158][159][160][161][162][163]
systems assess the amount of methane in the seabed.[164][165][166][167] This is important to assess the potential for leaks from these reserves into the sea and (eventually) the atmosphere (in the seabed, there is probably more carbon trapped in methane than there is in all other forms of conventional fossil fuel, yet as a greenhouse gas methane is 20 times more potent per molecule than carbon dioxide, so assessing how much is in the seabed, and how much leaks into the atmosphere, is a key task).[168]
devised theory and methodology for measuring key parameters in the transfer of atmospheric gas between atmosphere and ocean, that was later included in large-scale multi-national trials[169][112][27][28][29] This is important for climate change modelling, because over 1000million tonnes of atmospheric carbon transfers each year between atmosphere and ocean.
In the late 1980s, Leighton[175] discovered a new ultrasonic signal[175][176][177][178] that he identified as due to surface waves on the walls of gas bubbles in liquids.[179][180][181] Multidisciplinary research in the following 11 parallel streams of work[182] turned this discovery into Sloan Water Technology Ltd:
Theory of how to stimulate these surface waves;[183][184]
measurement of the liquid convection and shear they generate;[112][2][5][185][30] theory on how sound causes the bubbles to generate cracks;[2][186][187]
theory for acoustics in porous materials (leading to the first theory to show why passing ultrasound through different directions in the human ankle could monitor osteoporosis);[117][122][123][118][121][119][120]
the world's first measurements of the bubble size distribution for industry and in the ocean surf zone,[188][189] leading to ocean measurements necessary to predict the climatological significance of the transfer of carbon dioxide between atmosphere and ocean.[151] It also provided techniques for measurement in industrial pipelines[190][191] which led to sensors for the oil and gas,[24] carbon capture and storage,[24][25][26] ceramics[192] and nuclear[172][170][104] industries.
measurement of the liquid convection and shear from these surface waves;[112][2][5][185][30] theory on how sound causes the bubbles to generate cracks;[2][186][187]
acoustic losses in water surrounded on all sides by air and containing microscopic natural particles;[193][194][195]
acoustic propagation down straight columns of liquid with pressure release walls, and the effect of bubbles within such columns;[190]
acoustic propagation down curved columns of fluid, and how horns could facilitate this;[36][101][37][105][196]
These 11 streams of fundamental research represented the knowledge on which Sloan Water Technology Ltd. was founded.[11] Having purchased Professor Leighton's patent suite from the University of Southampton in 2018, the Allen family chose to name the new R&D facilities ‘The Leighton Laboratories’,[208] consisting of physical science labs, mechanical engineering and electronic engineering labs, workshops, and microbiology and tissue laboratories, co-locating multiple disciplines as Professor Leighton had advocated to address unsolved problems of a societal scale (food and water security, anti-microbial resistance).[71][72] The company is currently producing technology for cleaning and changing surfaces using only cold water, air bubbles and sound (without chemicals or drugs).[209][210][30][185] This reduces the use of water and electricity,[211] reduces pollution and has run-off that is easier to convert back to drinking water, and reduces the threat of ‘superbugs’.[48][72]
Sloan Water Technology Ltd. has invented technology for cleaning surgical instruments[212][213] Food cleaning inventions have been developed for salad (which cannot be sterilized by heat treatment, and each year results in serious illness and even death from E. Coli contamination) [214][215] and hay (to reduce respiratory illness contracted through animal feed).[216] In the early days of the COVID-19 pandemic, when it was not known if the transmission route was airborne or through touch surfaces, Sloan Water Technology developed devices to clean touch surfaces.[217] Sloan Water Technology's most significant product is aimed at reducing the suffering from chronic wounds, which cause huge suffering and costs the UK NHS over £5-billion per year.[218][219]
Awards and honours
Leighton has been awarded the following medals and distinctions:
the 2002 Tyndall Medal of the Institute of Acoustics
the 1994 A. B. Wood Medal of the Institute of Acoustics[230]
The citation of the 2006 Paterson Medal of the Institute of Physics states that:
Timothy Leighton's contribution is outstanding in both breadth and depth. He is an acknowledged world leader in four fields... He has delivered over 70 pioneering advances, from devices now used in hospitals to the world's first count of bubbles in the surf zone (crucial to our understanding of atmosphere-ocean gas flux, coastal erosion and the optimisation of military sonar). Behind these advances lies rigorous physics.[228]
Awards
2019 Doctor of Science, University of Cambridge[231]
2018 Royal Society's Lord Leonard and Lady Estelle Wolfson Foundation Translation Award for the StarHealer[232]
the 2014 'Best new product of the year' award for StarStream[233][234][235][236]
the 2012 Institute of Chemical Engineering Award for Water Management and Supply[237]
Timothy Leighton is distinguished for his research on the acoustical physics of bubbles, especially their nonlinear behaviour; for his inventions and discoveries including bubble measurements in the surf zone, pipelines and methane seeps; for shock wavelithotripsy monitoring, disease detection in cancellous bone and needle free injection; for sonar systems that overcome bubble masking and numerous industrial applications. His seminal monograph The Acoustic Bubble has become the primary reference on bubble physical acoustics.[243]
In 2018 he was elected to Fellowship of the Academy of Medical Sciences, the citation reading for 'harnessing the physical sciences for the benefit of patients' as:
an outstanding academic inventor whose leadership in acoustical physics of bubbles has led to the development of new medical devices and procedures. His research has dominated the field of acoustic bubbles since the appearance of his monograph in 1994, ‘The Acoustic Bubble’, which was published at the age of 29. In this, he laid out the mathematical foundation upon which much of the recent cutting edge research on ultrasonic contrast agents, drug delivery, and focused ultrasound surgery has been based. He has exceptional ability to deliver engineering solutions to real world problems from conceptualisation to product development embracing an advanced practical knowledge of IP strategy.[12]
In 2018 the International Institute of Acoustics and Vibration (IIAV), of which he had not been a member, undertook a change to its Bylaws, and vote of all IIAV members, to create new rank of Distinguished Fellow. It is the highest rank for individual IIAV members of this international body, and Professor Leighton was the recipient in its inaugural year.[252]
Outreach, TV and radio work
Leighton has developed and conducted multiply-award-winning outreach activities to the public, and to encourage of young men and women to engage, and possibly follow careers in, science and engineering, with school visits, science fairs, exhibits, games, and appearances on TV and radio.[8][253][254] His public engagement work regarding his invention, “The most dangerous game in the world”, which he designed to communicate with the public on the issue of superbugs and how they can protect themselves and society, was mentioned by Steve Brine MP, the Under-Secretary of State for Health on 16 November 2017.[69][70] The IMDb and "Who's Who" have collated entries for Professor Leighton.[255][1] In his 2014 book 'Sonic Wonderland', the broadcaster Trevor Cox described Professor Leighton as 'a middle-aged Harry Potter'.[256]
Related Research Articles
Acoustics is a branch of physics that deals with the study of mechanical waves in gases, liquids, and solids including topics such as vibration, sound, ultrasound and infrasound. A scientist who works in the field of acoustics is an acoustician while someone working in the field of acoustics technology may be called an acoustical engineer. The application of acoustics is present in almost all aspects of modern society with the most obvious being the audio and noise control industries.
Sonar is a technique that uses sound propagation to navigate, measure distances (ranging), communicate with or detect objects on or under the surface of the water, such as other vessels.
Ultrasound is sound with frequencies greater than 20 kilohertz. This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound. Ultrasonic devices operate with frequencies from 20 kHz up to several gigahertz.
Sonication is the act of applying sound energy to agitate particles in a sample, for various purposes such as the extraction of multiple compounds from plants, microalgae and seaweeds. Ultrasonic frequencies (> 20 kHz) are usually used, leading to the process also being known as ultrasonication or ultra-sonication.
In chemistry, the study of sonochemistry is concerned with understanding the effect of ultrasound in forming acoustic cavitation in liquids, resulting in the initiation or enhancement of the chemical activity in the solution. Therefore, the chemical effects of ultrasound do not come from a direct interaction of the ultrasonic sound wave with the molecules in the solution.
High-intensity focused ultrasound (HIFU), or MR-guided Focused Ultrasound Surgery is an incision-less therapeutic technique that uses non-ionizing ultrasonic waves to heat or ablate tissue. HIFU can be used to increase the flow of blood or lymph or to destroy tissue, such as tumors, via thermal and mechanical mechanisms. Given the prevalence and relatively low cost of ultrasound generation mechanisms, the premise of HIFU is that it is expected to be a non-invasive and low-cost therapy that can at least outperform care in the operating room.
Throat singing refers to several vocal practices found in different cultures worldwide. These vocal practices are generally associated with a certain type of guttural voice that contrasts with the most common types of voices employed in singing, which are usually represented by chest (modal) and head registers. Throat singing is often described as evoking the sensation of more than one pitch at a time, meaning that the listener perceives two or more distinct musical notes while the singer is producing a single vocalization.
Sound from ultrasound is the name given here to the generation of audible sound from modulated ultrasound without using an active receiver. This happens when the modulated ultrasound passes through a nonlinear medium which acts, intentionally or unintentionally, as a demodulator.
The angular spectrum method is a technique for modeling the propagation of a wave field. This technique involves expanding a complex wave field into a summation of infinite number of plane waves of the same frequency and different directions. Its mathematical origins lie in the field of Fourier optics but it has been applied extensively in the field of ultrasound. The technique can predict an acoustic pressure field distribution over a plane, based upon knowledge of the pressure field distribution at a parallel plane. Predictions in both the forward and backward propagation directions are possible.
A parametric array, in the field of acoustics, is a nonlinear transduction mechanism that generates narrow, nearly side lobe-free beams of low frequency sound, through the mixing and interaction of high frequency sound waves, effectively overcoming the diffraction limit associated with linear acoustics. The main side lobe-free beam of low frequency sound is created as a result of nonlinear mixing of two high frequency sound beams at their difference frequency. Parametric arrays can be formed in water, air, and earth materials/rock.
A Bessel beam is a wave whose amplitude is described by a Bessel function of the first kind. Electromagnetic, acoustic, gravitational, and matter waves can all be in the form of Bessel beams. A true Bessel beam is non-diffractive. This means that as it propagates, it does not diffract and spread out; this is in contrast to the usual behavior of light, which spreads out after being focused down to a small spot. Bessel beams are also self-healing, meaning that the beam can be partially obstructed at one point, but will re-form at a point further down the beam axis.
D. Jackson Coleman is a professor of clinical ophthalmology at NewYork-Presbyterian Hospital at The Edward S. Harkness Eye Institute of Columbia University. He is the former John Milton McLean Professor of Ophthalmology and chairman emeritus at Weill Cornell Medical Center where he served as chairman from 1979 to 2006. His specialties are retinal diseases and ultrasound, working with patients at Columbia University Medical Center. Coleman is also engaged in research involving ultrasound, which he has pursued throughout his career with colleague Ronald Silverman in the Department of Ophthalmology at the Columbia University Medical Center.
The ASA Silver Medal is an award presented by the Acoustical Society of America to individuals, without age limitation, for contributions to the advancement of science, engineering, or human welfare through the application of acoustic principles or through research accomplishments in acoustics. The medal is awarded in a number of categories depending on the technical committee responsible for making the nomination.
Floyd Dunn was an American electrical engineer who made contributions to all aspects of the interaction of ultrasound and biological media. Dunn was a member of Scientific Committee 66 of the National Council on Radiation Protection and Measurements as well as many FDA, NIH, AIUM, and ASA committees. He collaborated with scientists in the UK, Japan, China and Post-Soviet states.
Acoustic radiation force (ARF) is a physical phenomenon resulting from the interaction of an acoustic wave with an obstacle placed along its path. Generally, the force exerted on the obstacle is evaluated by integrating the acoustic radiation pressure over its time-varying surface.
Acoustic resonance spectroscopy (ARS) is a method of spectroscopy in the acoustic region, primarily the sonic and ultrasonic regions. ARS is typically much more rapid than HPLC and NIR. It is non destructive and requires no sample preparation as the sampling waveguide can simply be pushed into a sample powder/liquid or in contact with a solid sample.
Mathias Fink, born in 1945 in Grenoble, is a French physicist, professor at ESPCI Paris and member of the French Academy of Sciences.
Helen Czerski is a British physicist and oceanographer and television presenter. She is an associate professor in the department of mechanical engineering at University College London. She was previously at the Institute for Sound and Vibration Research at the University of Southampton.
In acoustics, acoustic attenuation is a measure of the energy loss of sound propagation through an acoustic transmission medium. Most media have viscosity and are therefore not ideal media. When sound propagates in such media, there is always thermal consumption of energy caused by viscosity. This effect can be quantified through the Stokes's law of sound attenuation. Sound attenuation may also be a result of heat conductivity in the media as has been shown by G. Kirchhoff in 1868. The Stokes-Kirchhoff attenuation formula takes into account both viscosity and thermal conductivity effects.
Floyd Rowe Watson was an American experimental physicist, known for his research on acoustics and the acoustical design of buildings.
↑ Crum, L. A. (1994). "Review of the Accoustic[sic] Bubble, by T. G. Leighton". Journal of Sound and Vibration. 174 (5): 709–710. doi:10.1006/jsvi.1994.1305.
1 2 Brooks, I.M., Yelland, M.J., Upstill-Goddard, R.C., Nightingale, P.D., Archer, S., D'Asaro, E., Beale, R., Beatty, C., Blomquist, B., Bloom, A. A., Brooks, B. J., Cluderay, J., Coles, D., Dacey, J., DeGrandpre, M., Dixon, J., Drennan, W. M., Gabriele, J., Goldson, L., Hardman-Mountford, N., Hill, M. K., Horn, M., Hsueh, P.-C., Huebert, B., de Leeuwuw, G., Leighton, T. G., Liddicicoat, M., Lingard, J. J. N., McNeil, C., McQuaid, J. B., Moat, B. I., Moore, G., Neill, C., Norris, S. J., O-Doherty, S., Pascal, R. W., Prytherch, J., Rebozo, M., Sahlee, E., Salter, M., Schuster, U., Skjelvan, I., Slagter, H., Smith, M. H., Smith, P. D., Srokosz, M., Stephens, J. A., Taylor, P. K., Telszewski, M., Walsh, R., Ward, B., Woolf, D. K., Young, D. and Zemmmmelink, H. (2009). "Physical Exchanges at the Air-Sea Interface: UK-SOLAS Field Measurements". Bulletin of the American Meteorological Society. 90 (5): 629–644. Bibcode:2009BAMS...90..629B. doi:10.1175/2008BAMS2578.1. hdl:1912/4016.{{cite journal}}: CS1 maint: multiple names: authors list (link)
1 2 Brooks, I.M., Yelland, M.J., Upstill-Goddard, R.C., Nightingale, P.D., Archer, S., D'Asaro, E., Beale, R., Beatty, C., Blomquist, B., Bloom, A. A., Brooks, B. J., Cluderay, J., Coles, D., Dacey, J., DeGrandpre, M., Dixon, J., Drennan, W. M., Gabriele, J., Goldson, L., Hardman-Mountford, N., Hill, M. K., Horn, M., Hsueh, P.-C., Huebert, B., de Leeuwuw, G., Leighton, T. G., Liddicicoat, M., Lingard, J. J. N., McNeil, C., McQuaid, J. B., Moat, B. I., Moore, G., Neill, C., Norris, S. J., O-Doherty, S., Pascal, R. W., Prytherch, J., Rebozo, M., Sahlee, E., Salter, M., Schuster, U., Skjelvan, I., Slagter, H., Smith, M. H., Smith, P. D., Srokosz, M., Stephens, J. A., Taylor, P. K., Telszewski, M., Walsh, R., Ward, B., Woolf, D. K., Young, D. and Zemmmmelink, H. (2009). "Electronic supplement to: Physical Exchanges at the Air-Sea Interface: UK-SOLAS Field Measurements". Bulletin of the American Meteorological Society. 90 (5): ES9–ES16. doi:10.1175/2008BAMS2578.2. hdl:1912/4017.{{cite journal}}: CS1 maint: multiple names: authors list (link)
1 2 3 4 Leighton, Timothy G.; Petculescu, Andi (2009). "The Sound of Music and Voices in Space Part 1: Theory". Acoustics Today. 5 (3): 17–26. doi:10.1121/1.3238123. ISSN1557-0215.
1 2 Leighton, T. G.; Fedele, F; Coleman, A. J.; McCarthy, C; Ryves, S; Hurrell, A. M.; De Stefano, A; White, P. R. (2008). "A passive acoustic device for real-time monitoring of the efficacy of shockwave lithotripsy treatment". Ultrasound in Medicine & Biology. 34 (10): 1651–65. doi:10.1016/j.ultrasmedbio.2008.03.011. PMID18562085.
↑ Leighton, T.G. and White, P.R. (2004). "The Sound of Titan: A role for acoustics in space exploration". Acoustics Bulletin. 29 (4): 16–23.{{cite journal}}: CS1 maint: multiple names: authors list (link)
1 2 3 Leighton, Timothy G.; Petculescu, Andi (2009). "The Sound of Music and Voices in Space Part 2: Modeling and Simulation". Acoustics Today. 5 (3): 27–29. doi:10.1121/1.3238123. ISSN1557-0215.
↑ Leighton, T.G., White, P.R. and Finfer, D.C. (2012). "The opportunities and challenges in the use of extra-terrestrial acoustics in the exploration of the oceans of icy planetary bodies". Earth, Moon, and Planets. 109 (1–4): 99–116. Bibcode:2012EM&P..109...91L. doi:10.1007/s11038-012-9399-6. S2CID120569869.{{cite journal}}: CS1 maint: multiple names: authors list (link)
1 2 3 Jiang, J; Baik, K; Leighton, T.G. (2011). "Acoustic attenuation, phase and group velocities in liquid-filled pipes II: Simulation for Spallation Neutron Sources and planetary exploration". The Journal of the Acoustical Society of America. 130 (2): 695–706. Bibcode:2011ASAJ..130..695J. doi:10.1121/1.3598463. PMID21877784. S2CID386262.
↑ Ainslie, M. A.; Leighton, T. G. (2009). "Near resonant bubble acoustic cross-section corrections, including examples from oceanography, volcanology, and biomedical ultrasound". The Journal of the Acoustical Society of America. 126 (5): 2163–75. Bibcode:2009ASAJ..126.2163A. doi:10.1121/1.3180130. PMID19894796.
↑ Leighton, T.G., Finfer, D., Grover, E. and White, P.R. (2007). "An acoustical hypothesis for the spiral bubble nets of humpback whales and the implications for whale feeding". Acoustics Bulletin. 22 (1): 17–21.{{cite journal}}: CS1 maint: multiple names: authors list (link)
↑ Leighton, T.G., Richards, S.D. and White, P.R. (2004). "Trapped within a 'wall of sound': A possible mechanism for the bubble nets of the humpback whales". Acoustics Bulletin. 29 (1): 24–29.{{cite journal}}: CS1 maint: multiple names: authors list (link)
1 2 Leighton, T. G.; Finfer, D. C.; Chua, G. H.; White, P. R.; Dix, J. K. (2011). "Clutter suppression and classification using twin inverted pulse sonar in ship wakes". The Journal of the Acoustical Society of America. 130 (5): 3431–7. Bibcode:2011ASAJ..130.3431L. doi:10.1121/1.3626131. PMID22088017.
1 2 Hughes, E. R.; Leighton, T. G.; Petley, G. W.; White, P. R. (1999). "Ultrasonic propagation in cancellous bone: A new stratified model". Ultrasound in Medicine and Biology. 25 (5): 811–21. doi:10.1016/s0301-5629(99)00034-4. PMID10414898.
1 2 Hughes, E. R.; Leighton, T. G.; White, P. R.; Petley, G. W. (2007). "Investigation of an anisotropic tortuosity in a biot model of ultrasonic propagation in cancellous bone". The Journal of the Acoustical Society of America. 121 (1): 568–74. Bibcode:2007ASAJ..121..568H. doi:10.1121/1.2387132. PMID17297810.
1 2 Leighton, T. G. (2011). "Innovation to Impact in a Time of Recession". Journal of Computational Acoustics. 19: 1–25. doi:10.1142/S0218396X11004298.
↑ Turangan, C.K., Jamaluddin, A.R., Ball, G.J. and Leighton, T.G. (2008). "Free-Lagrange simulations of the expansion and jetting collapse of air bubbles in water". Journal of Fluid Mechanics. 598: 1–25. Bibcode:2008JFM...598....1T. doi:10.1017/s0022112007009317. S2CID18465532.{{cite journal}}: CS1 maint: multiple names: authors list (link)
↑ Leighton, T.G., Phelps, A.D., Cox, B.T. and Ho, W.L. (1998). "Theory and preliminary measurements of the Rayleigh-like collapse of a conical bubble". Acustica with ActaAcustica. 84 (6): 1014–1024.{{cite journal}}: CS1 maint: multiple names: authors list (link)
↑ Leighton, T. G.; Ho, W. L.; Flaxman, R. (1997). "Sonoluminescence from the unstable collapse of a conical bubble". Ultrasonics. 35 (5): 399–405. doi:10.1016/S0041-624X(97)00014-0.
↑ Leighton, T.G., Cox, B.T., Birkin, P.R. and Bayliss, T. (1999) [Forum Acusticum 99, integrating the 25th German Acoustics DAGA Conference]. "The Rayleigh-like collapse of a conical bubble: Measurements of meniscus, liquid pressure, and electrochemistry". Proceedings of the 137th Meeting of the Acoustical Society of America and the 2nd Convention of the European Acoustics Association. Berlin, Paper 3APAB_1, 4pp.{{cite journal}}: CS1 maint: multiple names: authors list (link)
↑ Bryant, G., Hewitt, P., Hope, J., Howard, C., Ironside, J., Knight, R., Manson, J., Mead, S., Medley, G., Minor, P., Ridgway, G., Salmon, R., Ashcroft, P., Bennett, P., Bent, A., Burke, P., Cardigan, R., Connor, N., Riley, A., Cutts, D., Gadd, E., Gauci, E., Gauci, T., Grimley, P., Hidderley, A., Hill, I., Kirby, C., Mitchell, L., Noterman, M., Pride, J., Pryer, D., Singh, J., Stanton, G., Tomlinson, N., Wight, A., Bradley, R., Griffin, G., Jones, P., Jeffries, D., Matthews, D., May, D., McConnell, I., Painter, M., Smith, P., Spellman, R., Taylor, D., Wyatt., T., Adams, R., Allison, M., Archyangelio, A., Barker, J., Barlow, T., Barnass, S., Bedi, R., Bethel, N. Bountiff, L., Bradley, C., Bramble, M., Bruce, M., Caterall, J., Chow, Y., Christie, P., Cobbold, A., Conroy, A., Craig, G., Crawford, P., Crook, P., Cumming, R., Elliot, D., Fraise, A., Gray, R., Griffiths, H., Herve, R., Holmes, S., Holton, J., Langdon, J., Leighton, T., Jones, A., Keevil, W., Latham, B., Lucas, S., Lumley, J., McCardle, L., Marsh, H., Martin, M., Murphy, J., Perrett, D., Richards, K., Reader, N., Revesz, T., Sjogren, G., Smith, A., Smith, G., Stephenson, J., Sutton, M., Treasure, E., Walker, J., Watkins, G., Will, R., Woodhead, K. "Minimise transmission risk of CJD and vCJD in healthcare settings. Report on the Prevention of CJD and vCJD by Advisory Committee on Dangerous Pathogens' Transmission Spongiform Encephalopathy (ACDP TSE) Subgroup"(PDF). Published as Part of the Creutzfeldt-Jakob Disease (CJD): Guidance, Data and Analysis Reports by the UK Government Department of Health (22 October 2015). Crown Copyright 2015.{{cite journal}}: CS1 maint: multiple names: authors list (link)
↑ Term of Service ended as committee completed work and submitted final report
↑ Leighton, T. G.; Evans, R. C. P. (1 May 2008). "The detection by sonar of difficult targets (including centimetre-scale plastic objects and optical fibres) buried in saturated sediment". Applied Acoustics. The detection of buried marine targets. 69 (5): 438–463. doi:10.1016/j.apacoust.2007.05.002.
↑ Flohr, A., Schaap, A., Achterberg, E.P., Alendal, G., Arundell, M., Berndt, C., Blackford, J., Bottner, C., Borisov, S.M., Brown, R., Bull, J.M., Carter, L., Chen, B., Dale, A.W., de Beer, D., Dean, M., Deusner, C., Dewar, M., Durden, J.M., Elsen, S., Esposito, M., Faggetter, M., Fischer, J.P., Gana, A., Gros, J., Haeckel, M., Hanz, R., Holtappels, M., Hosking, B., Huvenne, V.A.I., James, R.H., Koopmans, D., Kossel, E., Leighton, T.G., Li, J., Lichtschlag, A., Linke, P., Loucaides, S., Martinez-Cabanas, M., Matter, J.M., Mesher, T., Monk, S., Mowlem, M., Oleynik, A., Papadimitriou, S., Paxton, D., Pearce, C.R., Peel, K., Roche, B., Ruhl, H.A., Saleem, U., Sands, C., Saw, K., Schmidt, M., Sommer, S., Strong, J.A., Triest, J., Ungerbock, B., Walk, J., White, P., Widdicombe, S., Wilson, R.E., Wright, H., Wyatt, J. and Connelly, D. (2021). "Towards improved monitoring of offshore carbon storage: A real-world field 1 experiment detecting a controlled sub-seafloor CO2 release". International Journal of Greenhouse Gas Control. 106: 103237. Bibcode:2021IJGGC.10603237F. doi:10.1016/j.ijggc.2020.103237. hdl:11250/2992008. S2CID233391860.{{cite journal}}: CS1 maint: multiple names: authors list (link)
↑ Connelly, D. P., Bull, J. M., Flohr, A., Schaap, A., Koopmans, D., Blackford, J. C., White, P. R., James, R. H., Pearce, C., Lichtschlag, A., Achterberg, E. P., de Beer, D., Roche, B. , Li, J., Saw, K., Alendal, G., Avlesen, H., Brown, R., Borisov, S. M., Bottner, C., Cazenave, P. W., Chen, B., Dale, A. W., Dean, M., Dewar, M., Esposito, M., Gros, J., Hanz, R., Haeckel, M., Hosking, B., Huvenne, V., Karstens, J., Le Bas, T., Leighton, T. G., Linke, P., Loucaides, S., Matter, J. M., Monk, S., Mowlem, M. C., Oleynik, A., Omar, A. M., Peel, K., Provenzano, G., Saleem, U., Schmidt, M., Schramm, B., Sommer, S., Strong, J. (2022). "Assuring the integrity of offshore carbon dioxide storage". Renewable and Sustainable Energy Reviews. 166: 112670. Bibcode:2022RSERv.16612670C. doi:10.1016/j.rser.2022.112670. hdl:11250/3023870. S2CID249615764.{{cite journal}}: CS1 maint: multiple names: authors list (link)
↑ Leighton, T. G.; Meers, S. D.; White, P. R. (2004). "Propagation through nonlinear time-dependent bubble clouds and the estimation of bubble populations from measured acoustic characteristics". Proceedings of the Royal Society A. 460 (2049): 2521–2550. Bibcode:2004RSPSA.460.2521L. doi:10.1098/rspa.2004.1298. S2CID17334755.
↑ Baik, K.; Jiang, J.; Leighton, T. G. (2013). "Acoustic attenuation, phase and group velocities in liquid-filled pipes III: Nonaxisymmetric propagation and circumferential modes in lossless conditions". The Journal of the Acoustical Society of America. 133 (3): 1225–36. Bibcode:2013ASAJ..133.1225B. doi:10.1121/1.4773863. PMID23463995.
↑ Leighton, T. G.; Jiang, J.; Baik, K. (2012). "Demonstration comparing sound wave attenuation inside pipes containing bubbly water and water droplet fog". The Journal of the Acoustical Society of America. 131 (3): 2413–21. Bibcode:2012ASAJ..131.2413L. doi:10.1121/1.3676732. PMID22423788. S2CID32710397.
↑ Leighton, T.G., Jiang, J. and Baik, K (2011). "A TV demonstration of sound absorption connecting the space shuttle to submarines". Acoustics Bulletin. 36 (4): 35–40.{{cite journal}}: CS1 maint: multiple names: authors list (link)
1 2 3 Leighton, T.G. (2016). The acoustic bubble: Oceanic bubble acoustics and ultrasonic cleaning. Proceedings of Meetings on Acoustics. Proceedings of Meetings on Acoustics. Vol.24. p.070006. doi:10.1121/2.0000121.
↑ Leighton, Timothy (2017). "Climate change, dolphins, spaceships and anti-microbial resistance - The impact of bubble acoustics". Proceedings of the International Congress on Sound and Vibration. 24: 1–16.
1 2 Anon (2014). "Professor Timothy Leighton FREng FRS". London: royalsociety.org. Archived from the original on 6 March 2016. One or more of the preceding sentences incorporates text from the royalsociety.org website where:
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