Frequency-agile CO2 DIAL for environmental monitoring

Lewis W. Carr; Leland Fletcher; Max Crittenden; Clinton B. Carlisle; Steven W. Gotoff; Felix Reyes; Francis M. D'Amico

doi:10.1117/12.177309

3 June 1994 Frequency-agile CO₂ DIAL for environmental monitoring

Lewis W. Carr, Leland Fletcher, Max Crittenden, Clinton B. Carlisle, Steven W. Gotoff, Felix Reyes, Francis M. D'Amico

Proceedings Volume 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements; (1994) https://doi.org/10.1117/12.177309
Event: SPIE's International Symposium on Optical Sensing for Environmental Monitoring, 1993, Atlanta, GA, United States

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.

Citation Download Citation

Lewis W. Carr, Leland Fletcher, Max Crittenden, Clinton B. Carlisle, Steven W. Gotoff, Felix Reyes, and Francis M. D'Amico "Frequency-agile CO₂ DIAL for environmental monitoring", Proc. SPIE 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements, (3 June 1994); https://doi.org/10.1117/12.177309

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