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Proceedings Paper

Multiwavelength And Triple CO2 Lidars For Trace Gas Detection
Author(s): Joseph Leonelli; Peter L. Holland; Jan E. van der Laan
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Paper Abstract

SRI International has developed two infrared differential absorption lidar (IR DIAL) systems to detect infrared-absorbing trace gases and environmental monitoring applications. The multiwavelength DIAL system operates at 10.6 μm and performs both path-integrated (column-content) and range-resolved measurements. This van-mounted system contains four grating-tuned Tachisto 555-G (custom) TEA CO2 lasers, with a nominal 1 J of transmitted energy at 10P(20). The lasers are typically fired with a 100 μs spacing to freeze the atmosphere. The IR receiver uses a 16-in. f/2.5 telescope and a liquid-nitrogen-cooled HgCdTe quadrant detector. The scanner allows pointing over a full hemisphere. The lidar data system features two DEC PDP-11/73 microcomputers and a computer automated measurement and control (CAMAC) data acquisition system for real-time data collection, signal averaging, data analysis, color graphics display, and storage on magnetic tape. The multiwavelength DIAL system has demonstrated path-integrated measurements to a range of 9 km and range-resolved measurements to 4 km. The triple CO2 DIAL system operates at 3.4 μm and utilizes three mini-TEA CO2 lasers and nonlinear crystals in a novel frequency-mixing technique to detect and discriminate selective hydrocarbons.

Paper Details

Date Published: 25 July 1989
PDF: 14 pages
Proc. SPIE 1062, Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing, (25 July 1989); doi: 10.1117/12.951879
Show Author Affiliations
Joseph Leonelli, SRI International (United States)
Peter L. Holland, SRI International (United States)
Jan E. van der Laan, SRI International (United States)

Published in SPIE Proceedings Vol. 1062:
Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing
Martin M. Sokoloski, Editor(s)

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