Abstract

This paper describes the parametric analysis of an optical fiber–based gamma thermometer (OFBGT) that is intended to be used to infer the power distribution in the Ohio State University Research Reactor (OSURR). The OFBGT measures the radial temperature difference $\mathrm{\Delta }T$ between an optical fiber that is within the thermal mass and an optical fiber that is within the capillary tube that is attached to the exterior of the outer sheath of the OFBGT. This gas gap acts as a thermal resistance to volumetric gamma heating $q{ }^{\mathrm{\prime }\mathrm{\prime }\mathrm{\prime }}$ of the OFBGT thermal mass. Of the six that are analyzed, one is deemed most appropriate for operation in the OSURR Central Irradiation Facility. This design produces a maximum $\mathrm{\Delta }T$ of ~50°C at full reactor power (450 kW). A comparison of the six OFBGT designs generally shows how modifications of the design that increase $\mathrm{\Delta }T$ suffer from decreased spatial resolution.

摘要

本文介绍了基于光纤的伽马温度计 (OFBGT) 的参数分析，该温度计旨在用于推断俄亥俄州立大学研究反应堆 (OSURR) 的功率分布。OFBGT 测量径向温差$\mathrm{\Delta }吨$在热质量内的光纤和连接到 OFBGT 外护套外部的毛细管内的光纤之间。该气隙充当对体积伽马加热的热阻$q{ }^{\mathrm{\prime }\mathrm{\prime }\mathrm{\prime }}$OFBGT 热质量。在分析的六个中，一个被认为最适合在 OSURR 中央辐照设施中运行。这种设计产生最大$\mathrm{\Delta }吨$在反应堆全功率 (450 kW) 下约 50°C。六种 OFBGT 设计的比较通常显示了设计的修改如何增加$\mathrm{\Delta }吨$ 遭受空间分辨率降低的困扰。