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23 October 1997 Low-noise detector and amplifier design for 100-ns direct detection CO2 lidar receiver
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The development and test results of a prototype detector/amplifier design for a background limited, pulsed 100 ns, 10 - 100 kHz repetition rate LIDAR/DIAL receiver system are presented. Design objectives include near-matched filter detection of received pulse amplitude and round trip time-of- flight, and the elimination of excess correlated detector/amplifier noise for optimal pulse averaging. A novel pole-zero cancellation amplifier, coupled with a state-of-the- art SBRC (Santa Barbara Research Center) infrared detector was implemented to meet design objectives. The pole-zero cancellation amplifier utilizes a tunable, pseudo-matched filter technique to match the width of the laser pulse to the shaping time of the filter for optimal SNR performance. Low frequency correlated noise, (1/f and drift noise) is rejected through a second order high gain feedback loop. The amplifier also employs an active detector bias stage minimizing detector drift. Experimental results will be provided that demonstrate near-background limited, 100 ns pulse detection performance given an 8.5 - 11.5 micrometer (300 K B.B.) radiant background, with the total noise floor spectrally white for optimal pulse averaging efficiency.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Maureen M. Cafferty, Bradly J. Cooke, Bryan E. Laubscher, Nicholas L. Olivas, and Kenneth R. Fuller "Low-noise detector and amplifier design for 100-ns direct detection CO2 lidar receiver", Proc. SPIE 3122, Infrared Spaceborne Remote Sensing V, (23 October 1997);

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