Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-07-28
1990-11-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502311, 374121, 374127, 374137, 356349, 356 43, G01N 1506, G01J 500, G01B 902
Patent
active
049738534
ABSTRACT:
Apparatus for measuring the unknown subsurface temperature T.sub.s of a bulk transparent medium such as ocean water comprises a pulsed laser having a high intensity (power per unit area) output beam split into two sub-beams, one of which is a probe beam directed into the ocean water. The intensity of the output beam pulses exceeds a predetermined threshold sufficient to cause stimulated Brillouin scattering within the medium and to produce therefrom a phase-conjugate beam which propagates along the path of the first sub-beam but in the opposite direction. The second sub-beam is reflected by a mirror to and combines with the PC beam and the combined beams are mixed at the cathode of a photodetector which produces a heterodyne frequency that is proportional to the temperature T.sub.s. A frequency measuring instrument converts the heterodyne frequency into a temperature value equal to T.sub.s.
REFERENCES:
patent: 4057349 (1977-11-01), Barrett
patent: 4123160 (1978-10-01), Caputo et al.
patent: 4411525 (1983-10-01), Ogawa
patent: 4637716 (1987-01-01), Auweter et al.
patent: 4767219 (1988-08-01), Bibby
patent: 4823166 (1989-04-01), Hartog et al.
patent: 4859065 (1989-08-01), Bibby
patent: 4867558 (1989-09-01), Leonard et al.
patent: 4867564 (1989-09-01), Sweeney et al.
Hirschberg et al., "Speed of Sound and Temperature in the Ocean by Brillouin Scattering", Applied Optics, vol. 23, No. 15, 8/84, pp. 2624-2628.
Leonard Donald A.
Sweeney Harold E.
Gilbert Douglas M.
GTE Government Systems Corporation
Lawler John F.
Messinger Michael
Nelms David C.
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