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Optical gamma thermometer

United States Patent

August 6, 2013
View the Complete Patent at the US Patent & Trademark Office
An optical gamma thermometer includes a metal mass having a temperature proportional to a gamma flux within a core of a nuclear reactor, and an optical fiber cable for measuring the temperature of the heated metal mass. The temperature of the heated mass may be measured by using one or more fiber grating structures and/or by using scattering techniques, such as Raman, Brillouin, and the like. The optical gamma thermometer may be used in conjunction with a conventional reactor heat balance to calibrate the local power range monitors over their useful in-service life. The optical gamma thermometer occupies much less space within the in-core instrument tube and costs much less than the conventional gamma thermometer.
Koste; Glen Peter (Niskayuna, NY), Xia; Hua (Altamont, NY), Lee; Boon Kwee (Clifton Park, NY)
General Electric Company (Niskayuna, NY)
12/ 259,931
October 28, 2008
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH & DEVELOPMENT This invention was made with Government support under contract number DE-FC07-07ID14778 awarded by the United States Department of Energy. The Government has certain rights in the invention.