Abstract: Physical Sciences Inc. (PSI) has developed an Adaptive IR Imaging Spectroradiometer, comprised of a low-order tunable Fabry-Perot etalon coupled to an HgCdTe detector array, for passive, stand-off detection of chemical vapor plumes. The tunable etalon allows coverage of the 9.5 to 14 $mu@m spectral region with a resolution of approximately 7 cm$+$MIN@1$/ and provides the capability to obtain monochromatic images of a scene at only those wavelengths needed for chemical species identification and quantification. The adaptive sampling capability of the etalon allows suppression of background clutter and minimization of data volume. The tuning time between transmission wavelengths is typically approximately 10 ms, however the mirror tuning system may be operated to obtain tuning times as short as 1.3 ms. We present results using a brassboard imaging system for stand-off detection and visualization of chemical vapor plumes against near ambient temperature backgrounds. This data shows detections limits of 22 ppmv m and 0.6 ppmv m for DMMP and SF$-6$/ respectively against a $Delta@T of 6 K. The reported detection limits are consistent with the measured system noise-equivalent spectral radiance, approximately 2 $mu@W cm$+$MIN@2$/ sr$+$MIN@1$/ $mu@m$+$MIN@1$/. !14
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机译：摘要：Physical Sciences Inc.（PSI）开发了一种自适应红外成像光谱仪，该仪由低阶可调Fabry-Perot标准具与HgCdTe检测器阵列耦合而成，用于化学蒸气羽的被动式，对立式检测。可调标准具可覆盖9.5至14μm的光谱区域，分辨率约为7cm $ + MIN @ 1 $ /，并提供仅在化学物种所需的那些波长下获得场景单色图像的能力鉴定和定量。标准具的自适应采样功能可以抑制背景杂波并最小化数据量。透射波长之间的调谐时间通常约为10 ms，但是可以操作镜面调谐系统以获得短至1.3 ms的调谐时间。我们介绍了使用黄铜板成像系统对近环境温度背景下的远距离检测和化学蒸气羽可视化的结果。该数据显示DMMP和SF $ -6 $ /的检出限分别为22 ppmv m和0.6 ppmv m，$ Delta @ T为6K。报告的检出限与测得的系统噪声当量光谱辐射率一致，大约为2 $ mu @ W cm $ + $ MIN @ 2 $ / sr $ + $ MIN @ 1 $ / $ mu @ m $ + $ MIN @ 1 $ /。 ！14
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