Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1987-12-28
1989-07-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356152, 340956, G01J 120, G08G 500, G01B 1126
Patent
active
048474819
ABSTRACT:
An arrangement for position finding of a laser beam in a scattering medium with a laser transmitter and a laser receiver followed by an evaluation circuit. In order to be able to differentiate in the incoming laser radiation the unscattered coherent content and the scattered content, the laser transmitter is connected to a modulation circuit for intensity modulation of the transmitted laser beam with a characteristic modulation frequency (f.sub.L >1/T.sub.s) with the pulse duration spread being T.sub.s, which a brief laser pulse experiences upon being scattered in the medium. In addition, the receiver is connected to an electronic frequency filter tuned to the characteristic modulation frequency. Thereby, essentially only the unscattered coherent content of the laser beam is utilized for evaluation.
REFERENCES:
patent: 3875400 (1975-04-01), Pao et al.
patent: 4196346 (1980-04-01), McElhannon
patent: 4664518 (1987-05-01), Pfund
patent: 4691385 (1987-09-01), Tupman
patent: 4710028 (1987-12-01), Grenier et al.
Plotkin et al., "Optical Communication in Free Space", Chapter 3, Report No: AGARO-AG-195, 12/74, pp. 3-1 to 3-9.
Messerschmitt-Bolkow-Blohm GmbH
Messinger Michael
Nelms David C.
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