Spectral Analysis for DIAL and Lidar Detection of TATP
Final rept. 15 May 2006 - 14 May 2008
UNIVERSITY OF SOUTH FLORIDA TAMPA
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The preliminary development and use of a tunable 10.6 micron C02 laser DIAL system for the remote sensing of TATP explosive gases was experimentally studied. TATP has a large vapor pressure with strong absorption features near 3.3 micron. 8.4 micron, and 10.6 micron. Toward this end, a tunable C02 DIAL system was constructed using a tunable l-W CW C02 laser, diagnostic spectrometers. 16 diameter telescope and cooled HqCdTe detectors. The backscatter lidar return from a remote retro-reflector target at a range of about 100m was used for the lidarDIAL signal. The DIAL beam was also transmitted through a laboratory absorption cell containing an injected small sample of TATP. Detection and measurements of the TATP gas concentration in the cell were made at levels of 1 ngmicro liter. However, the concentration of TATP was found to be unstable over long periods of time due possibly to re-absorption and crystallization of the TATP vapors on the absorption cell windows. Our results also indicate that a more optimized pulsed C02 laser DIAL system could be used for greater detection ranges, and that pulsed DIAL systems near 3.3 micron and 8.4 micron could also be used for TATP detection.
- Optical Detection and Detectors