Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1990-01-16
1997-01-14
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 285, G01C 308, C01P 336
Patent
active
055945430
ABSTRACT:
An optical radar system includes a laser diode and an external cavity formed by a partial reflector for reflecting a first portion of the laser beam back into the diode. A second portion of the beam is passed out of the external cavity for backscatter thereof from a target back into the diode. The emission thereby has a beat frequency related to the velocity of the target. A frequency chirp is introduced by mechanically oscillating the partial reflector longitudinally resulting in a modulation frequency in the emission corresponding to the range of the target. A photodetector and processor are used to determine the velocity and range.
REFERENCES:
patent: 4611912 (1986-09-01), Falk et al.
patent: 4662741 (1987-05-01), Duvall et al.
patent: 4919532 (1990-04-01), Mocker et al.
patent: 4928152 (1990-05-01), Gerardin
de Groot Peter
Gallatin Gregg M.
Roychoudhuri Chandra
Buczinski Stephen C.
Denson-Low W. K.
Hughes Danbury Optical Systems, Inc.
Schubert W. C.
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