FTIR modulator for first responder applications

摘要

This paper describes the evolution and capabilities of our Fourier transform infrared (FTIR) modulator in multiple configurations for various applications concerning Homeland Security. The heart of our system is the extremely compact and rugged Michelson interferometer we originally developed during our involvement with the JSLSCAD program. (1) Our "J-Series" modulator is capable of resolving the 7 to 14 μm spectral region to 4 or 16 cm~(-1) with a measured radiometric sensitivity of 2x10~(-9) W/(cm~2ster·cm~(-1)). This system has successfully undergone rigorous testing for operation over a temperature range of -40 to +65°C and vibration levels associated with a spectrum of military ground, air, and water vehicles. The following describes the design and characterization of our J-Series modulator as well as the subsequent evolutions of the instrument in the forms of an active open-path FTIR and an imaging (hyperspectral) FTIR. We present this system in passive and active configurations with cooled, uncooled, and imaging detectors. We also project sensitivity limits for each configuration and measurement for some common chemical agents as well as industrial compounds.