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- W2032893703 abstract "The FIRST, a commercial hyperspectral imager developed by Telops, features high sensitivity in acompact and robust package. This sensor provides hypercubes of spectral radiance of up to 320x256pixels at 0.35mrad spatial resolution over the 8 - 12 mm spectral range at user selectable spectralresolutions of up to 0.25 cm-1. The measurements are converted into maps by the use ofpowerful algorithms using both spatial and spectral information. The FIRST has been used at several fieldtests for the standoff detection and identification of chemicals. During these tests, the sensor is usuallyoperated at 4 cm-1 of spectral resolution and the image size is tailored according to the dissemination.Algorithms based on a combination of clutter-matched filters and spectral angle mapper have beendeveloped and used to process the measured data. The algorithms combine sub-band selection tominimize the correlation between the spectral signatures in the library and careful selection of thethresholds to reduce the level of false alarms. The output of the algorithms is the image of the cloudssuperimposed on the broadband thermal image. JHU/APL has developed a processing approach thatadapts to different backgrounds, yields low probability of false alarm, and performs well in the presenceof hot pixels. The algorithm combines background/noise suppression techniques, spectral detectiontechniques, such as the spectral angle mapper and the matched filter, and automatic adaptive thresholdtechniques. This paper will present the successful standoff detection and identification of variouschemical compounds using a variety of field measurements. Images of chemical disseminations will bepresented, with some of them including mixtures of 2 different chemicals." @default.
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- W2032893703 date "2007-04-27" @default.
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- W2032893703 title "Field test results of standoff chemical detection using the FIRST" @default.
- W2032893703 doi "https://doi.org/10.1117/12.719677" @default.
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