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首页> 外文期刊>IEEE sensors journal >y Analytic Thermal Model of an Optical Fiber Based Gamma Thermometer and its Application in a University Research Reactor
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y Analytic Thermal Model of an Optical Fiber Based Gamma Thermometer and its Application in a University Research Reactor

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摘要

This paper describes and validates, by comparison with numerical modeling results, an analytical model of thermal transport in an optical fiber based gamma thermometer (OFBGT) that is appropriate for use in university research reactors. The maximum temperature difference between the thermal mass and the outer sheath (Delta T) for theOFBGT design thatwe have consideredis approximately 50 degrees C, for theOFBGT in the Central Irradiation Facility of the Ohio State University Research Reactor (OSURR) with the reactor operating at full power (450 kW). The maximum value of Delta T that is predicted by the analytic model for the OFBGT design is smaller by approximately 1.1 degrees C than the value of Delta T which is predicted by the numerical model, for the same OFBGT design, but including all the details of the design. We have used the analyticalmodel of thermal transport in an OFBGT to determine a normalized Modulation Transfer Function (MTF (k)) for the OFBGT. We conclude that MTF (k(OSU)) > 0.99, where k(OSU) is the spatial frequency for the axial dependence of the reactor power distribution in the OSURR.

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