Comparison of active and passive FTIR

Thomas C. Gruber Jr.; Larry B. Grim; John T. Ditillo

doi:10.1117/12.317644

6 August 1998 Comparison of active and passive FTIR

Thomas C. Gruber Jr., Larry B. Grim, John T. Ditillo

Proceedings Volume 3383, Electro-Optical Technology for Remote Chemical Detection and Identification III; (1998) https://doi.org/10.1117/12.317644
Event: Aerospace/Defense Sensing and Controls, 1998, Orlando, FL, United States

Abstract

This paper discusses the result of a field trial in which active and passive FTIRs measured plume concentration pathlength (CL). It will be shown that when the coadding duration of passive systems was the same as active systems, nearly identical CL values were obtained. At the field trial, plumes of SF₆ were released. The release rate and duration were controlled using a flowmeter. All the FTIR systems were monitoring approximately the same spot in the plume. Weather station data and flowmeter data were used with a gaussian plume model to predict downwind CLs. The active CLs were determined with standard CLS processing. The passive CLs were determined by converting the passive spectra to radiometric spectra. From the radiometric spectra, the air temperature and background temperature were derived. With this information, the absorbance was calculated and the CL was determined from the absorbance peak of the chemical.

Citation Download Citation

Thomas C. Gruber Jr., Larry B. Grim, and John T. Ditillo "Comparison of active and passive FTIR", Proc. SPIE 3383, Electro-Optical Technology for Remote Chemical Detection and Identification III, (6 August 1998); https://doi.org/10.1117/12.317644

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