Remote method of measuring subsurface water temperatures

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

1989-08-29

1991-03-05

Rosenberger, Richard A.

Optics: measuring and testing

Optical pyrometers

356349, 374117, G01B 902

Patent

active

049972731

ABSTRACT:
A technique for measuring the unknown subsurface temperature T.sub.s of a bulk transparent medium such as ocean water by generating a continuous (cw) laser beam and pulsed laser beam both having the same wavelength, with the intensity of the pulsed laser beam exceeding the intensity required to produce stimulated Brillouin scattering in the water. By directing the pulsed laser beam into the water, it causes a return phase-conjugate beam to emanate therefrom. The return phase-conjugate beam and the pulsed laser beam are separated, and the phase-conjugate beam and the cw beam are mixed together thereby producing a heterodyne frequency proportional to the temperature T.sub.s. By converting 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.
Inaba et al., "Infrared Laser Radar Technique Using Heterodyne Detection", Optics Communications, vol. 14, No. 1, (May 1975), pp. 119-122.
Hirschberg et al., "Speed of Sound and Temperature in the Ocean by Brillouin Scattering", Applied Optics, vol. 23, No. 15, (Aug. 1, 1984), pp. 2624-2628.
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).
Development of Simple Equations for Accurate and More Realistic Calculation of the Speed of Sound in Seawater by C. C. Leroy, "Journal of Acoustical Society of America," No. 216, vol. 46, pp. 216-226, (1969).

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