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Proceedings Paper

Tunable IR differential absorption lidar for remote sensing of chemicals
Author(s): Coorg R. Prasad; Pierre Kabro; Savyasachee L. Mathur
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Paper Abstract

Standoff sensors for rapid remote detection of chemical emissions from either clandestine chemical production sites, chemical and biological warfare agents, concealed internal combustion engine emissions or rocket propellants from missiles are required for several DoD applications. The differential absorption lidar (DIAL) operating in the infrared wavelengths has established itself as a very effective tool for rapidly detecting many of the chemicals, with sufficient sensitivity with a range of several kilometers. The wavelengths required for this task lie within the atmospheric window regions 3 to 5 micrometers and 8 to 12 micrometers . We are currently developing a differential absorption lidar (DIAL) tunable in the 3 to 5 micrometers range for detecting low concentrations of chemical species with high sensitivity (5 ppb) and accuracy (error < 10%) measurements for greater than 5 km range. We have successfully established the feasibility of an innovative frequency agile laser source which is the crucial component of the infrared DIAL. A diode-pumped ytterbium YAG laser was built for pumping and rapidly tuning an optical parametric oscillator (OPO) over the mid-infra red region. Good performance (5 mJ/pulse) of the laser and low threshold wide infra red tuning of OPO (2.2 - 3.1 micrometers ) were demonstrated. The simulated performance of the topographical IR-DIAL showed that 5 ppb concentration can be measured at 5 km range with a 35 cm telescope.

Paper Details

Date Published: 22 October 1999
PDF: 9 pages
Proc. SPIE 3757, Application of Lidar to Current Atmospheric Topics III, (22 October 1999); doi: 10.1117/12.366422
Show Author Affiliations
Coorg R. Prasad, Science & Engineering Services, Inc. (United States)
Pierre Kabro, Science & Engineering Services, Inc. (United States)
Savyasachee L. Mathur, Science & Engineering Services, Inc. (United States)


Published in SPIE Proceedings Vol. 3757:
Application of Lidar to Current Atmospheric Topics III
Arthur J. Sedlacek; Kenneth W. Fischer, Editor(s)

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