Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-08-24
1988-10-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356222, 2191216, H01J 314
Patent
active
047806079
ABSTRACT:
A monitoring arrangement monitors the power of a light beam which travels in a predetermined path between a laser and a destination location and is reflected at a predetermined location of the path from a reflecting surface of a deflecting mirror, with attendant inherent light scattering into a space portion. The monitoring arrangement includes at least one sensor situated in a space portion having the reflecting surface and imaginary extensions thereof for its boundary and including the predetermined path. The sensor is located between a reflected portion of the light beam and the boundary, preferably close to the boundary, to intercept and sense scattered light reaching it, especially forward-scattered light of the original laser beam, and generates a signal representative of the intensity of such intercepted scattered light. This signal is then evaluated. At least one additional sensor may be situated in the space portion between the incident portion of the original laser beam and the boundary to intercept and sense scattered light reaching it, which is primarily constituted by forward-scattered light of a return light beam that travels substantially in the predetermined path back to the laser after reflection at the destination location.
REFERENCES:
patent: 4035088 (1977-07-01), Jenkins et al.
patent: 4242581 (1980-12-01), Crow
patent: 4260255 (1981-04-01), Wachs et al.
patent: 4720618 (1988-01-01), Stamer et al.
Nelms David C.
Ruoff Jessica L.
Ruzek Peter R.
United Technologies Corporation
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