Effect of Gamma-Ray and Neutron Heating as Interfering Input for the Measurement of Temperature Using Optical Fiber Sensor System

Thomas E. Blue; Brandon Augustus Wilson

doi:10.1109/TNS.2017.2756564

Effect of Gamma-Ray and Neutron Heating as Interfering Input for the Measurement of Temperature Using Optical Fiber Sensor System

Thomas E. Blue, Brandon Augustus Wilson

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

2 Scopus citations

Abstract

This paper accounts for gamma-ray and neutron heating of an optical fiber/capillary tube temperature sensor by including current sources in the fiber and capillary tube in the electrical analog of the capillary tube/fiber sensor system. The resulting model is examined to determine the conditions for which gamma-ray and neutron heating of the capillary tube/fiber sensor system is a significant interfering input for the measurement of the steady-state temperature of the medium in which the capillary tube/fiber sensor system is immersed, or the temperature of the component to which the capillary tube/fiber sensor system is attached. The model predicts that gamma-ray and neutron heating may result in a discrepancy, on the order of tens of degrees centigrade, in the sensed temperature, in comparison to the temperature of the medium, for a bare fiber in stagnant air for a power reactor. However, for the case of bonding of a capillary tube/fiber sensor system to metal, or the placement of the sensor in a liquid for which the heat transfer coefficient exceeds approximately ×10⁺⁴Wm²K, the discrepancy in the sensed temperature is predicted to be negligible for power reactor neutron and gamma-ray absorbed dose rates.

Original language	English
Article number	8049311
Pages (from-to)	2774-2781
Number of pages	8
Journal	IEEE Transactions on Nuclear Science
Volume	64
Issue number	11
DOIs	https://doi.org/10.1109/TNS.2017.2756564
State	Published - Nov 2017
Externally published	Yes

Funding

Manuscript received April 21, 2017; revised June 21, 2017; accepted June 26, 2017. Date of publication September 26, 2017; date of current version November 14, 2017. This work was supported by the Department of Energy Nuclear University Programs through an Integrated Research Project, “Advanced Instrumentation for Transient Reactor Testing,” under Grant GRT00035185.

Funders	Funder number
Department of Energy Nuclear University Programs	GRT00035185

Keywords

Gamma-ray heating
nuclear reactors instrumentation
optical fiber sensors
temperature measurement

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10.1109/TNS.2017.2756564

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title = "Effect of Gamma-Ray and Neutron Heating as Interfering Input for the Measurement of Temperature Using Optical Fiber Sensor System",

abstract = "This paper accounts for gamma-ray and neutron heating of an optical fiber/capillary tube temperature sensor by including current sources in the fiber and capillary tube in the electrical analog of the capillary tube/fiber sensor system. The resulting model is examined to determine the conditions for which gamma-ray and neutron heating of the capillary tube/fiber sensor system is a significant interfering input for the measurement of the steady-state temperature of the medium in which the capillary tube/fiber sensor system is immersed, or the temperature of the component to which the capillary tube/fiber sensor system is attached. The model predicts that gamma-ray and neutron heating may result in a discrepancy, on the order of tens of degrees centigrade, in the sensed temperature, in comparison to the temperature of the medium, for a bare fiber in stagnant air for a power reactor. However, for the case of bonding of a capillary tube/fiber sensor system to metal, or the placement of the sensor in a liquid for which the heat transfer coefficient exceeds approximately ×10+4Wm2K, the discrepancy in the sensed temperature is predicted to be negligible for power reactor neutron and gamma-ray absorbed dose rates.",

keywords = "Gamma-ray heating, nuclear reactors instrumentation, optical fiber sensors, temperature measurement",

author = "Blue, {Thomas E.} and Wilson, {Brandon Augustus}",

note = "Publisher Copyright: {\textcopyright} 2012 IEEE.",

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N2 - This paper accounts for gamma-ray and neutron heating of an optical fiber/capillary tube temperature sensor by including current sources in the fiber and capillary tube in the electrical analog of the capillary tube/fiber sensor system. The resulting model is examined to determine the conditions for which gamma-ray and neutron heating of the capillary tube/fiber sensor system is a significant interfering input for the measurement of the steady-state temperature of the medium in which the capillary tube/fiber sensor system is immersed, or the temperature of the component to which the capillary tube/fiber sensor system is attached. The model predicts that gamma-ray and neutron heating may result in a discrepancy, on the order of tens of degrees centigrade, in the sensed temperature, in comparison to the temperature of the medium, for a bare fiber in stagnant air for a power reactor. However, for the case of bonding of a capillary tube/fiber sensor system to metal, or the placement of the sensor in a liquid for which the heat transfer coefficient exceeds approximately ×10+4Wm2K, the discrepancy in the sensed temperature is predicted to be negligible for power reactor neutron and gamma-ray absorbed dose rates.

AB - This paper accounts for gamma-ray and neutron heating of an optical fiber/capillary tube temperature sensor by including current sources in the fiber and capillary tube in the electrical analog of the capillary tube/fiber sensor system. The resulting model is examined to determine the conditions for which gamma-ray and neutron heating of the capillary tube/fiber sensor system is a significant interfering input for the measurement of the steady-state temperature of the medium in which the capillary tube/fiber sensor system is immersed, or the temperature of the component to which the capillary tube/fiber sensor system is attached. The model predicts that gamma-ray and neutron heating may result in a discrepancy, on the order of tens of degrees centigrade, in the sensed temperature, in comparison to the temperature of the medium, for a bare fiber in stagnant air for a power reactor. However, for the case of bonding of a capillary tube/fiber sensor system to metal, or the placement of the sensor in a liquid for which the heat transfer coefficient exceeds approximately ×10+4Wm2K, the discrepancy in the sensed temperature is predicted to be negligible for power reactor neutron and gamma-ray absorbed dose rates.

KW - Gamma-ray heating

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KW - temperature measurement

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Effect of Gamma-Ray and Neutron Heating as Interfering Input for the Measurement of Temperature Using Optical Fiber Sensor System

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