CO(2) laser-based differential absorption lidar system for range-resolved and long-range detection of chemical vapor plumes.

A dual CO(2) laser-based differential absorption lidar (DIAL) system has been constructed and demonstrated for range-resolved mapping of chemical vapor plumes. The system acquires high range resolution through the use of plasma-shutter pulse clippers that extinguish the nitrogen tail of the CO(2)-laser output. Aprogrammable servomotor-driven scanner allows full hemispherical coverage of the interrogated field. A high-speed direct-detection receiver subsystem is used to gather, process, and display vapor-concentration data in near real time. Data demonstrating range-resolved detection of low concentrations of chemical plumes from ranges of 1 to 2 km are presented. In the column-content detection mode, trace levels of secondary vapors from various organophosphate liquids were monitored. Detection of an SF(6) vapor plume released 16 km from the DIAL system is also adduced.

[1]  N Menyuk,et al.  Laser remote sensing of atmospheric ammonia using a CO2 lidar system. , 1985, Applied optics.

[2]  R E Warren,et al.  Detection and discrimination using multiple-wavelength differential absorption lidar. , 1985, Applied optics.

[3]  Raymond D. Mindlin,et al.  Forced Thickness-Shear and Flexural Vibrations of Piezoelectric Crystal Plates , 1952 .

[4]  E. Uthe.  Airborne CO2 DIAL measurement of atmospheric tracer gas concentration distributions. , 1986, Applied optics.

[5]  N Menyuk,et al.  Laser remote sensing of hydrazine, MMH, and UDMH using a differential-absorption CO2 lidar. , 1982, Applied optics.

[6]  R E Warren,et al.  Adaptive Kalman-Bucy filter for differential absorption lidar time series data. , 1987, Applied optics.

[7]  F. D'Amico,et al.  High pulse repetition frequency, multiple wavelength, pulsed CO(2) lidar system for atmospheric transmission and target reflectance measurements. , 1992, Applied optics.

[8]  J. E. van der Laan,et al.  Atmospheric water vapor measurements with an infrared (10‐μm) differential‐absorption lidar system , 1976 .

[9]  Assessment of relative error sources in IR DIAL measurement accuracy. , 1983, Applied optics.

[10]  E. Murray,et al.  Remote measurement of ethylene using a CO(2) differential-absorption lidar. , 1978, Applied optics.

[11]  R M Schotland,et al.  Correction function for the lidar equation and some techniques for incoherent CO(2) lidar data reduction. , 1988, Applied optics.

[12]  R. Harney.  Laser prf considerations in differential absorption lidar applications. , 1983, Applied optics.