Its 1-μm-pitch arrays, including the U6800 (640 × 512) and the U9000 (1280 × 1024) FPAs, are the sensors for the company’s Tenum 640 and Tenum 1280 camera modules as well as for cameras used in several U.S. Leonardo DRS (Arlington, VA), which produces uncooled vanadium oxide microbolometer FPAs, camera modules, and camera systems for military and commercial markets, has developed a line of small-pixel (10 μm pitch) arrays to complement its line of 17-μm-pitch arrays, as described by Doug Ransom, VP of Leonardo DRS’ Electro-Optical and Infrared Systems business. This article provides a bit of background on some commercial examples of current LWIR imagers. The list of applications for LWIR imaging is extensive, and includes many uses in surveillance and security biology, geology, and other sciences industrial inspection and process control and medical and veterinary fields. The most widely used sensor type used in LWIR imaging, and the one most covered in this article, is the uncooled bolometer focal-plane array (FPA), which is usually (but not always) based on vanadium oxide. LWIR imaging has the great advantages of being able to image objects by their own light and discriminate between objects based on their temperature in addition, LWIR imaging works well for outdoor use due to the relatively low output power of the Sun at LWIR wavelengths. Thermal imaging of objects at or near room temperature is typically done in the 8–14 μm longwave-infrared (LWIR)spectral band, as the Planck curve for blackbody radiation for room-temperature (300 K) objects peaks in the LWIR at about 9 μm.
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