Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1989-12-12
1991-02-26
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 285, G01C 308, G01P 336
Patent
active
049957201
ABSTRACT:
In a pulsed coherent Doppler radar, a Q-switched laser source develops a laser beam to have a high intensity pulse portion and a substantially lower intensity trailing tail portion. A switching device upon which the laser beam is incident directs substantially all of the energy of the pulse portion along a first propagation path towards a target, such as atmospheric aerosols, and substantially all of the energy of the tail portion along the second propagation path. The target reflects the pulse portion as a received signal. A heterodyne detector upon which each of the received signal and the tail portion is incident, determines the Doppler shift of the received signal with respect to the tail portion. The detector uses the tail portion as the local oscillator. The acousto-optic modulator also upshifts the frequency of the tail portion.
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I. Goldstein and A. Chabot, Characteristics of a Traveling-Wave Ruby Single-Mode Laser as a Laser Radar Transmitter, 9/9/66, pp. 519-523, IEEE Journal of Quantum Electronics, vol. QE-2, No. 9.
Buczinski Stephen C.
Litton Systems Inc.
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