Remote method of measuring subsurface water temperatures

Details Remote method of measuring subsurface water temperatures Remote method of measuring subsurface water temperatures

1989-07-28

1991-04-23

Rosenberger, Richard A.

Optics: measuring and testing

Optical pyrometers

356349, 374117, G01B 902

Patent

active

050095005

ABSTRACT:
A technique for measuring the unknown subsurface temperature T.sub.s of a bulk transparent medium such as ocean water by splitting a pulsed laser beam having a high intensity into two sub-beams, one of which is a probe beam directed into the medium. 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 combines with the PC beam and the combined beams mix at the cathode of a photodetector thereby producing a heterodyne frequency proportional to the temperature T.sub.s. Converts the heterodyne frequency into a temperature value yields the desired unknown T.sub.s.

REFERENCES:
patent: 4411525 (1983-10-01), Ogawa
patent: 4778238 (1988-10-01), Hicks
patent: 4778261 (1988-10-01), Boyd et al.
Hirschberg et al., "Speed of Sound and Temperature in the Ocean by Brillovin Scattering" Applied Optics (vol. 23, No. 15) (Aug. 1, 1984), pp. 2624-2628.
Ben-Yosef et al., "Measurement and Analysis of Mechanical Vibrations by Means of Optical Heterodyning Techniques" Journal of Physics E. vol. 7, No. 3 (Mar. 1974), pp. 218-220.
Optical Phase Conjugation by V. V. Shkunov, et al., "Scientific American," pp. 54-59.
Applications of Optical Phase Conjugation by D. M. Pepper, "Scientific American," pp. 74-83 (Jan. 1986).
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