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15 May 1981 Heterodyne CO2 Laser Rangefinder With Chirp Signal Processing
K. F. Hulme, B. S. Collins
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Proceedings Volume 0236, 1980 European Conf on Optical Systems and Applications; (1981) https://doi.org/10.1117/12.958999
Event: 1980 European Conference on Optical Systems and Applications, 1980, Utrecht, Netherlands
Abstract
A novel type of laser rangefinder,based on a CW CO2 laser and a specially-designed acousto-optic modulator,applies microwave signal processing concepts in the 10 micron spectral region. We used )4 microsecond duration, 14 MHz bandwidth chirp pulses and surface-acoustic-wave (SAW) expander and compressor devices. Compact optical design with a range capability of several kilometres is obtained by digitally integrating many returns processed at the rate of 30,000 returns per second. In chirp systems,moving targets produce, via the Doppler effect, a range error (8m per ms-1 our case), but, by using up-chirp and down-chirp waveforms, which produce opposite-sign errors, we determined both the range and radial velocity of moving targets.
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K. F. Hulme and B. S. Collins "Heterodyne CO2 Laser Rangefinder With Chirp Signal Processing", Proc. SPIE 0236, 1980 European Conf on Optical Systems and Applications, (15 May 1981); https://doi.org/10.1117/12.958999
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KEYWORDS
Signal processing
Doppler effect
Carbon dioxide lasers
Heterodyning
Microwave radiation
Signal detection
Laser applications
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