Wire and wire like object detection system

Details Wire and wire like object detection system Wire and wire like object detection system

1982-11-05

1986-02-25

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356152, A01C 308, G01B 1126

Patent

active

045726620

ABSTRACT:
An optical radar operating in the infrared region of the spectrum and adad to efficiently detect elongated targets such as wires. The pulsed transmitter is preferably passively Q-switched and produces optical pulses polarized in one direction. A CW local oscillator laser is locked to a frequency slightly offset from the transmitter frequency. A Brewster angle duplexer and a quarter wave plate in the transmit/receive path of the radar permit the transmitter flux to pass to a scanner and direct the orthogonally polarized echo signals to the heterodyne receiver which includes a display or alarm circuit. The transmitter and local oscillator lasers include frequency control circuits. Either wedge or ball joint type scanners may be used to scan the radar beam over a target area of interest.

REFERENCES:
patent: 3226721 (1965-12-01), Gould
patent: 3950100 (1976-04-01), Keene et al.
patent: 3984686 (1976-10-01), Fletcher et al.
patent: 4118109 (1978-10-01), Crawford et al.
patent: 4401886 (1983-08-01), Pond et al.
patent: 4457621 (1984-07-01), Harris et al.

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