Abstract: Passive standoff FTIR spectrometry relies on the radiance differential between a background scene and a target vapor analyte. Unlike traditional FTIR approaches controlling radiance levels within a narrow range, the passive configuration often encounters a large variance in radiance levels. This places higher demands on the passive FTIR configuration for maintaining linearity. The present study assesses the radiometric linearity of a passive FTIR configuration using controlled blackbody radiance in conjunction with target samples such as a polystyrene film and ethanol vapors. !11
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