Multiwavelength And Triple CO2 Lidars For Trace Gas Detection

Joseph Leonelli; Peter L. Holland; Jan E. van der Laan

doi:10.1117/12.951879

25 July 1989 Multiwavelength And Triple CO₂ Lidars For Trace Gas Detection

Joseph Leonelli, Peter L. Holland, Jan E. van der Laan

Proceedings Volume 1062, Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing; (1989) https://doi.org/10.1117/12.951879
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

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.

Citation Download Citation

Joseph Leonelli, Peter L. Holland, and Jan E. van der Laan "Multiwavelength And Triple CO₂ Lidars For Trace Gas Detection", Proc. SPIE 1062, Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing, (25 July 1989); https://doi.org/10.1117/12.951879

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available