Focal-plane array testing

Last updated
A 2D nanowire array; light field in a nanolaser. Used to create a multi-color focal plane array. 2D nanowire array.jpg
A 2D nanowire array; light field in a nanolaser. Used to create a multi-color focal plane array.

Focal plane array testing is a specialized field of test engineering. Focal plane array (FPA) imaging devices are used in missile guidance sensors, infrared astronomy, manufacturing inspection, and thermal imaging. Focal plane array testing is the process of verifying and validating that these devices function correctly. Focal plane arrays are complex to develop, in some cases the fabrication process may have more than 150 steps, [1] testing of these devices must ensure that each step has the desired result.

Contents

The actual test methodology used for testing focal plane arrays differs depending on the type of device. However, the types of tests usually fall into one of the following categories: diagnostic, performance, statistical, system simulation, or end-to-end simulation. [2]

Government oversight of testing

The development and testing military technology such as FPAs is concentrated in the space and defense industries. As a result of this Congress, in 1983, established the Office of the Director of Operational Test and Evaluation (DOT&E) to coordinate, monitor, and evaluate operational testing of major weapon systems. A DOT&E report states this more directly: "The military services need confidence that their systems will not fail during mission execution..." [3]

As part of the Office of the Secretary of Defense, DOT&E is separate from acquisition (that also conducts developmental and operational testing) and therefore is in a position to provide the Secretary and Congress with an independent view. Congress created DOT&E in response to reports of conflicts of interest in the acquisition community's oversight of operational testing leading to inadequate testing of operational suitability and effectiveness and the fielding of new systems that performed poorly.

Notes

  1. Razeghi, Manijeh (2006). Fundamentals of Solid State Engineering. Birkhäuser. p. 807. ISBN   978-0-387-28152-0.
  2. Monroe Schlessinger; Irving J. Spiro (1995). Infrared Technology Fundamentals. CRC Press. p. 403. ISBN   978-0-8247-9259-6.
  3. "Developing a Reliability Investment Model" (PDF). Retrieved 10 January 2009.

Related Research Articles

<span class="mw-page-title-main">Thermographic camera</span> Imaging device using infrared radiation

A thermographic camera is a device that creates an image using infrared (IR) radiation, similar to a normal camera that forms an image using visible light. Instead of the 400–700 nanometre (nm) range of the visible light camera, infrared cameras are sensitive to wavelengths from about 1,000 nm to about 14,000 nm (14 μm). The practice of capturing and analyzing the data they provide is called thermography.

<span class="mw-page-title-main">Thermography</span> Use of thermograms to study heat distribution in structures or regions

Infrared thermography (IRT), thermal video and/or thermal imaging, is a process where a thermal camera captures and creates an image of an object by using infrared radiation emitted from the object in a process, which are examples of infrared imaging science. Thermographic cameras usually detect radiation in the long-infrared range of the electromagnetic spectrum and produce images of that radiation, called thermograms. Since infrared radiation is emitted by all objects with a temperature above absolute zero according to the black body radiation law, thermography makes it possible to see one's environment with or without visible illumination. The amount of radiation emitted by an object increases with temperature; therefore, thermography allows one to see variations in temperature. When viewed through a thermal imaging camera, warm objects stand out well against cooler backgrounds; humans and other warm-blooded animals become easily visible against the environment, day or night. As a result, thermography is particularly useful to the military and other users of surveillance cameras.

<span class="mw-page-title-main">FGM-148 Javelin</span> American-made portable fire-and-forget anti-tank missile

The FGM-148 Javelin, or Advanced Anti-Tank Weapon System-Medium (AAWS-M), is an American-made man-portable anti-tank system in service since 1996, and continuously upgraded. It replaced the M47 Dragon anti-tank missile in US service. Its fire-and-forget design uses automatic infrared guidance that allows the user to seek cover immediately after launch, in contrast to wire-guided systems, like the system used by the Dragon, which require a user to guide the weapon throughout the engagement. The Javelin's high-explosive anti-tank (HEAT) warhead can defeat modern tanks by top attack, hitting them from above, where their armor is thinnest, and is also useful against fortifications in a direct attack flight.

<span class="mw-page-title-main">AAI Corporation</span>

AAI Corporation is an aerospace and defense development and manufacturing firm, located in Hunt Valley, Maryland, US. Formerly a wholly owned subsidiary of United Industrial Corporation, AAI was acquired by Textron in 2007. It currently operates as a unit of Textron Systems and employs more than 2,000.

A staring array, also known as staring-plane array or focal-plane array (FPA), is an image sensor consisting of an array of light-sensing pixels at the focal plane of a lens. FPAs are used most commonly for imaging purposes, but can also be used for non-imaging purposes such as spectrometry, LIDAR, and wave-front sensing.

The Institute for Defense Analyses (IDA) is an American non-profit corporation that administers three federally funded research and development centers (FFRDCs) – the Systems and Analyses Center (SAC), the Science and Technology Policy Institute (STPI), and the Center for Communications and Computing (C&C) – to assist the United States government in addressing national security issues, particularly those requiring scientific and technical expertise. It is headquartered in Alexandria, Virginia.

<span class="mw-page-title-main">Naval Surface Warfare Center Crane Division</span> Division of the U.S. Naval Surface Warfare Center

Naval Surface Warfare Center Crane Division is the principal tenant command located at Naval Support Activity Crane. NSA Crane is a United States Navy installation located approximately 35 miles (56 km) southwest of Bloomington, Indiana, and predominantly located in Martin County, but small parts also extend into Greene and Lawrence counties. It was originally established in 1941 under the Bureau of Ordnance as the Naval Ammunition Depot for the production, testing, and storage of ordnance under the first supplemental Defense Appropriation Act. The base is named after William M. Crane. The base is the third largest naval installation in the world by geographic area and employs approximately 3,300 people. The closest community is the small town of Crane, which lies adjacent to the northwest corner of the facility.

Chemical imaging is the analytical capability to create a visual image of components distribution from simultaneous measurement of spectra and spatial, time information. Hyperspectral imaging measures contiguous spectral bands, as opposed to multispectral imaging which measures spaced spectral bands.

<span class="mw-page-title-main">Air Force Operational Test and Evaluation Center</span> Direct reporting unit of the United States Air Force responsible for test and evaluation

Located at Kirtland Air Force Base, New Mexico, the Air Force Operational Test and Evaluation Center is a direct reporting unit of Headquarters, United States Air Force. It is the Air Force independent test agency responsible for testing, under operationally realistic conditions, new systems being developed for Air Force and multi-service use.

<span class="mw-page-title-main">Landsat 8</span> American Earth-observing satellite launched in 2013 as part of the Landsat program

Landsat 8 is an American Earth observation satellite launched on 11 February 2013. It is the eighth satellite in the Landsat program; the seventh to reach orbit successfully. Originally called the Landsat Data Continuity Mission (LDCM), it is a collaboration between NASA and the United States Geological Survey (USGS). NASA Goddard Space Flight Center in Greenbelt, Maryland, provided development, mission systems engineering, and acquisition of the launch vehicle while the USGS provided for development of the ground systems and will conduct on-going mission operations. It comprises the camera of the Operational Land Imager (OLI) and the Thermal Infrared Sensor (TIRS), which can be used to study Earth surface temperature and is used to study global warming.

<span class="mw-page-title-main">Operational Test and Evaluation Force</span> Military unit

The Operational Test and Evaluation Force (OPTEVFOR) is an independent and objective agency within the United States Navy for the operational testing and evaluation (OT&E) of naval aviation, surface warfare, submarine warfare, C4I, cryptologic, and space systems in support Navy and Department of Defense acquisition programs.

<span class="mw-page-title-main">Director, Operational Test and Evaluation</span> Adviser to the US Secretary of Defense

The Director, Operational Test and Evaluation (DOT&E) is the principal staff assistant and adviser to the US Secretary of Defense on operational and live fire test and evaluation activities involving U.S. Department of Defense weapons systems.

In the USA the Director for Test Systems Engineering and Evaluation (DTSE&E) commissioned in 1995 a one-year study to assess the effectiveness of the use of M&S in weapon systems acquisition and support processes.

<span class="mw-page-title-main">Sofradir</span>

Sofradir is a B2B company with headquarters in Châtenay-Malabry, France that designs and manufactures infrared (IR) detectors for military, space and commercial applications. The company’s shareholders are Thales, Sagem and Areva. Sofradir designs and manufactures cooled IR detector products that are based on Mercury Cadmium Telluride materials. MCT is considered a very high performance infrared technology. Sofradir also produces other detector technologies, including quantum well infrared photodetectors (QWIP) and uncooled microbolometer detectors.

<span class="mw-page-title-main">J. Michael Gilmore</span>

James Michael Gilmore is a former Director of the Operational Test and Evaluation Directorate of the United States Department of Defense. Gilmore served as Assistant Director for National Security of the Congressional Budget Office and Deputy Director of General Purpose Programs in the Office of the Director, Program Analysis and Evaluation of the Department of Defense. He was served as the Director of the Operational Test and Evaluation Directorate from 2009 to 2017.

<span class="mw-page-title-main">Science policy of the United States</span> Government support and limits of scientific research

The science policy of the United States is the responsibility of many organizations throughout the federal government. Much of the large-scale policy is made through the legislative budget process of enacting the yearly federal budget, although there are other legislative issues that directly involve science, such as energy policy, climate change, and stem cell research. Further decisions are made by the various federal agencies which spend the funds allocated by Congress, either on in-house research or by granting funds to outside organizations and researchers.

CIRCM, the Common Infrared Countermeasures program, is a United States Army initiative intended to develop a lightweight, low-cost and modular laser-based infrared protection system for U.S. helicopters and light fixed-wing aircraft. The technology will primarily provide defense against shoulder-fired, heat-seeking missiles, or MANPADS. The program is being developed to replace older suites such as the Advanced Threat Infrared Countermeasures (ATIRCM).

<span class="mw-page-title-main">NIRSpec</span> Spectrograph on the James Webb Space Telescope

The NIRSpec is one of the four scientific instruments flown on the James Webb Space Telescope (JWST). The JWST is the follow-on mission to the Hubble Space Telescope (HST) and is developed to receive more information about the origins of the universe by observing infrared light from the first stars and galaxies. In comparison to HST, its instruments will allow looking further back in time and will study the so-called Dark Ages during which the universe was opaque, about 150 to 800 million years after the Big Bang.

<span class="mw-page-title-main">Readout integrated circuit</span>

A Readout integrated circuit (ROIC) is an integrated circuit (IC) specifically used for reading detectors of a particular type. They are compatible with different types of detectors such as infrared and ultraviolet. The primary purpose for ROICs is to accumulate the photocurrent from each pixel and then transfer the resultant signal onto output taps for readout. Conventional ROIC technology stores the signal charge at each pixel and then routes the signal onto output taps for readout. This requires storing large signal charge at each pixel site and maintaining signal-to-noise ratio as the signal is read out and digitized.

<span class="mw-page-title-main">NIRCam</span> Imaging instrument aboard the James Webb Space Telescope

NIRCam is an instrument aboard the James Webb Space Telescope. It has two major tasks, as an imager from 0.6 to 5 micron wavelength, and as a wavefront sensor to keep the 18-section mirrors functioning as one. In other words, it is a camera and is also used to provide information to align the 18 segments of the primary mirror. It is an infrared camera with ten mercury-cadmium-telluride (HgCdTe) detector arrays, and each array has an array of 2048×2048 pixels. The camera has a field of view of 2.2×2.2 arc minutes with an angular resolution of 0.07 arcsec at 2 microns. NIRCam is also equipped with coronagraphs, which helps to collect data on exoplanets near stars. It helps with imaging anything next to a much brighter object, because the coronagraph blocks that light.

References