Analytic Thermal Model of an Optical Fiber Based Gamma Thermometer and its Application in a University Research Reactor

Anthony Birri; Christian M. Petrie; Thomas E. Blue

doi:10.1109/JSEN.2020.2978424

Analytic Thermal Model of an Optical Fiber Based Gamma Thermometer and its Application in a University Research Reactor

Anthony Birri, Christian M. Petrie, Thomas E. Blue

Advanced Fuel Fabrication and Instrument

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

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 the OFBGT design that we have considered is approximately {50}{circ }C, for the OFBGT 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 °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 analytical model of thermal transport in an OFBGT to determine a normalized Modulation Transfer Function ( MTF'(k)) for the OFBGT. We conclude that textit {MTF}{prime }left ({{k}_{textit {OSU}} }right)>{0.99}, where {k}_{textit {OSU}} is the spatial frequency for the axial dependence of the reactor power distribution in the OSURR.

Original language	English
Article number	9024016
Pages (from-to)	7060-7068
Number of pages	9
Journal	IEEE Sensors Journal
Volume	20
Issue number	13
DOIs	https://doi.org/10.1109/JSEN.2020.2978424
State	Published - Jul 1 2020

Funding

Manuscript received December 18, 2019; revised February 17, 2020; accepted February 29, 2020. Date of publication March 4, 2020; date of current version June 4, 2020. This work was supported by the Department of Energy through the Nuclear Energy Enabling Technologies Program: Sensors and Instrumentation for Data Generation. The work of Anthony Birri was supported by the Department of Energy Integrated University Program Fellowship. The associate editor coordinating the review of this article and approving it for publication was Prof. Agostino Iadicicco. (Corresponding author: Anthony Birri.) Anthony Birri and Thomas E. Blue are with the Nuclear Engineering Program, Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH 43210 USA (e-mail: [email protected]).

Keywords

Optical fiber sensors
gamma-ray detectors
modulation
thermal analysis
thermal sensors

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10.1109/JSEN.2020.2978424

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title = "Analytic Thermal Model of an Optical Fiber Based Gamma Thermometer and its Application in a University Research Reactor",

abstract = "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 the OFBGT design that we have considered is approximately \{50\}\{circ \}C, for the OFBGT 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 °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 analytical model of thermal transport in an OFBGT to determine a normalized Modulation Transfer Function ( MTF'(k)) for the OFBGT. We conclude that textit \{MTF\}\{prime \}left (\{\{k\}\_\{textit \{OSU\}\} \}right)>\{0.99\}, where \{k\}\_\{textit \{OSU\}\} is the spatial frequency for the axial dependence of the reactor power distribution in the OSURR.",

keywords = "Optical fiber sensors, gamma-ray detectors, modulation, thermal analysis, thermal sensors",

author = "Anthony Birri and Petrie, \{Christian M.\} and Blue, \{Thomas E.\}",

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N2 - 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 the OFBGT design that we have considered is approximately {50}{circ }C, for the OFBGT 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 °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 analytical model of thermal transport in an OFBGT to determine a normalized Modulation Transfer Function ( MTF'(k)) for the OFBGT. We conclude that textit {MTF}{prime }left ({{k}_{textit {OSU}} }right)>{0.99}, where {k}_{textit {OSU}} is the spatial frequency for the axial dependence of the reactor power distribution in the OSURR.

AB - 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 the OFBGT design that we have considered is approximately {50}{circ }C, for the OFBGT 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 °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 analytical model of thermal transport in an OFBGT to determine a normalized Modulation Transfer Function ( MTF'(k)) for the OFBGT. We conclude that textit {MTF}{prime }left ({{k}_{textit {OSU}} }right)>{0.99}, where {k}_{textit {OSU}} is the spatial frequency for the axial dependence of the reactor power distribution in the OSURR.

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KW - gamma-ray detectors

KW - modulation

KW - thermal analysis

KW - thermal sensors

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ER -

Analytic Thermal Model of an Optical Fiber Based Gamma Thermometer and its Application in a University Research Reactor

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