Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1989-08-01
1991-01-15
Cuchlinski, Jr., William A.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
374129, 374133, 374136, 356 43, 356349, G01K 500, G01K 1300, G01J 548
Patent
active
049849034
ABSTRACT:
To remotely measure the unknown subsurface temperature T.sub.s of a bulk transparent medium such as ocean water, a laser beam having a high power or intensity is split into two parts, a probe beam and a reference beam. The probe beam is directed into a sample of ocean water, and the reference beam into a reference sample of water having a known temperature T.sub.r. The intensities of the two beams, which exceed a predetermined threshold are sufficient to cause stimulated Brillouin scattering (SBS) within the two samples and produce therefrom two phase-conjugate beams. The two phase-conjugate beams are mixed to produce a heterodyne frequency that is proportional to the difference in temperature T.sub.s and T.sub.r. The frequency difference is converted into a temperature value equal to the value of T.sub.s.
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Cuchlinski Jr. William A.
Gilbert Douglas M.
GTE Government Systems Corporation
Lawler John F.
Wirthlin Alvin
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