Remote measurement of fluid temperature by Raman scattered radiation
 The remote temperature measurement of a fluid is determined by Raman backscattered radiation from the fluid where the fluid is subjected to intense pulses of laser radiation generated at a remote location. The backscattered radiation is filtered to selectively attenuate reflected radiation from the laser and is transmitted to a detector system which individually counts the detected radiation in each of two different radiated frequencies. A divider generates a ratio of the count which is transformed by a function generator to produce an output signal indicative of fluid temperature. 
The United States of America as represented by the Secretary of the Navy
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Chin H. Donald A. Lee A.
Chang Leonard Young