A hand-portable standoff trace chemical detection system was developed using a long-wave infrared (LWIR) microbolometer (MB) camera in combination with widely tunable external-cavity quantum cascade lasers. The system acquires hyperspectral images of the target surface's reflectance in the LWIR portion of the "chemical fingerprint" band to allow for high-sensitivity detection and high-specificity identification of a wide range of surface chemicals. With a LiDAR-based autofocus, the system can measure targets at standoff distances as long as 15 m with clear chemical signatures in the resulting spectrum. Array scan measurements of powder and liquid chemicals at various standoff distances are presented and shown to enable the user to spatially locate trace contaminants on a variety of surfaces. Finally, the stability of the SNR is analyzed and shown to enable reference-free measurements, a significant step towards a versatile "point-and-click" LWIR-based standoff trace chemical detector.
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Lenferink et al. (2024) studied this question.
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