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Proceedings Paper

Frequency-agile CO2 DIAL for environmental monitoring
Author(s): Lewis W. Carr; Leland Fletcher; Max Crittenden; Clinton B. Carlisle; Steven W. Gotoff; Felix Reyes; Francis M. D'Amico
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Paper Abstract

SRI International has designed and developed a fully automated frequency-agile CO2 DIAL (differential absorption lidar) system. The system sensor head consists of a single, frequency- agile, CO2, TEA laser; a 10-inch receiver telescope, a liquid-nitrogen-cooled HgCdTe detector; and a transmit energy monitor. The sensor head and its auxiliary equipment (including the data acquisition and processing system, laser power supply, and water cooler) are mounted in a Grumman-Olson 11-ft step van. The self-contained, mobile system can be used to detect and quantify many volatile organic compounds (VOCs) at parts per million sensitivities over open-path ranges to 5 km. Characterization and demonstration of the system is ongoing. However, data collected on benzene, toluene, xylene, methanol, ethyl acetate, acetic anhydride, and other VOCs will be described herein. The system could be used by industry and government agencies in stand-off monitoring to map VOC emission sources and transport patterns into surrounding communities. A single mobile system could be used for several locations to verify compliance with environmental regulations such as the 1990 Clean Air Act Amendments.

Paper Details

Date Published: 3 June 1994
PDF: 13 pages
Proc. SPIE 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements, (3 June 1994); doi: 10.1117/12.177309
Show Author Affiliations
Lewis W. Carr, SRI International (United States)
Leland Fletcher, SRI International (United States)
Max Crittenden, SRI International (United States)
Clinton B. Carlisle, SRI International (United States)
Steven W. Gotoff, U.S. Army (United States)
Felix Reyes, U.S. Army (United States)
Francis M. D'Amico, U.S. Army (United States)

Published in SPIE Proceedings Vol. 2112:
Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements
Alan Fried; Dennis K. Killinger; Harold I. Schiff, Editor(s)

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