Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1984-12-31
1987-11-17
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 5, G01C 308
Patent
active
047071281
ABSTRACT:
A coaxial, spacially gated, range gated, pulsed-beam, scanning system for use in turbid media, such as seawater, fog, snow, rain, blowing dust or sand. A laser emits a pulsed beam of light which travels to a beam splitter where part of the beam is transmitted and part is deflected. The transmitted beam is then deflected by an x-y scanning element such that a target is sequentially illuminated in a point-by-point manner. Light refected from the target travels back along the same path as the transmitted beam and is deflected by the beam splitter to a light sensor, such as photomultiplier tube. The field-of-view of the light sensor is limited and controlled in such a manner that it receives light only from that portion of the target that is illuminated by the portion of the transmitted beam light that has not been scattered by the turbid medium, and the system is range gated to accept only that portion of the output of the light sensor which is representative of the intensity of the non-scattered beam pulse which is reflected by the target. Range gatting may be triggered by detection of the leading edge of the reflected light pulse as it enters the sensor or by detection of the portion of the emitted beam that is deflected by the beam splitter. This allows use of a free-running laser.
REFERENCES:
patent: 3781111 (1973-12-01), Fletcher et al.
patent: 4121889 (1978-10-01), Soderstrom
patent: 4195311 (1980-03-01), Moran
patent: 4209252 (1980-06-01), Arditty et al.
patent: 4289397 (1981-09-01), Itzkan et al.
patent: 4518254 (1985-05-01), Penny et al.
"Underwater Viewing System for Use in Murky Water", Technical Proposed by Trident Corporation; 99 First St., Cambridge, Mass.; 1960.
"Laser TV Camera", Perkin-Elmer Press Release, Electronics Review; vol. 38, No. 24, pp. 29-30, Nov., 1965.
Ralph McManus, Arthur Chabot, "Scan Sychonrized Receiver Optimises Laser Ranging", Laser Focus, Oct. 1966; pp. 19-23.
N. E. Johnson, "Laser System for Underwater Observation", Research Development; vol. 19, No. 4, Apr. 1968.
E. Kornstein and H. Wetzstein, "Blue-Green High-Powered Light Extends Underwarer Visibility", Electronics; vol. 41, pp. 140-149 (68).
W. F. Matthews and R. F. Jung, "Laser Line-Scanning Sensors", SPIE Journal; vol. 14, No. 2; Mar./Apr. 1975, p. 116.
R. E. Hopkins, M. J. Buzawa, "Optics for Laser Scanning", Optical Engineering, vol. 15, No. 2, p. 90, 1976.
M. Green, "Limiting Range of Detection Throught Water in Mearly Coaxial Optical Transmitter-Receiver System", Optical Engineering, vol. 16, No. 2, Mar.-Apr. 1977.
P. J. Heckman, P. D. McCardell, "A Real-Time Optical Mapping System", Proceedings of the Society of Phot-Optical Instrumentational Engineer, vol. 160, pp. 189-196, 1978.
Buczinski Stephen C.
Koltak Melissa L.
Subsea Engineering Associates, Inc.
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