An Eye-safe Laser Radar has been developed under White Sands Missile Range sponsorship. The SEAL system, the Self-contained Eyesafe Autonomous Laser system, is designed to measure target position within a 0.5 meter box. Targets are augmented with Scotchlite for ranging out to 6 km and augmented with a retroreflector for targets out to 20 km. The data latency is less than 1.5 ms, and the position update rate is 1 kHz. The system is air-cooled, contained in a single 200-lb, 6-cubic-foot box, and uses less than 600 watts of prime power. The angle-angle-range data will be used to measure target dynamics and to control a tracking mount.
The optical system is built around a diode-pumped, erbium-doped fiber laser rated at 1.5 watts average power at 10 kHz repetition rate with 25 nsec pulse duration. An 8 inch-diameter, F/2.84 telescope is relayed to a quadrant detector at F/0.85 giving a 5 mrad field of view. Two detectors have been evaluated, a Germanium PIN diode and an Intevac TE-IPD. The receiver electronics uses a DSP network of 6 SHARC processors to implement ranging and angle error algorithms along with an Optical AGC, including beam divergence/FOV control loops.Laboratory measurements of the laser characteristics, and system range and angle accuracies will be compared to simulations. Field measurements against actual targets will be presented.
In addition 1:0common usage in atmospheric trace species measurements, the CO laser-based differential absorption (DIAL) and differenüal scattering (DISC) lidar sensor is also an extremely powerful tool for the remote detection, localization, identification and quantification of chemical vapors and liquids composed of the organophosphates that are used in insecticides and in deadly chemical warfare nerve agents such as Satin. The authors have designed, fabricated, and tested a C02 DIAL/DISC lidar sensor system that was optimized for the broad, but distinct spectral features, required for organophosphate detection. This paper describes the system, the field tests that were conducted, test results, and data analysis. Spectral pattern recognition techniques were used to obtain a receiver operating characteristic which relates the probability of detection and false a]ann to concentration-path-length products.
Key Words: carbon dioxide, lidar, DIAL, DISC, aerosols, chemical agents, pollution
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