Fiber Optic Calorimetry

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Description

A twin-bridge calorimeter using optical fiber as the sensor element was constructed and tested. This system demonstrates the principle and capability of using optical fibers for heat-flow measurements of special nuclear material. This calorimeter uses piezoelectric-generated phase-carrier modulation with subsequent electronic signal processes to allow phase shifts as small as 1 microradian ({micro}rad) to be measured. The sensing element consists of 21-m lengths of single-mode optical fiber wrapped around sample and reference chambers. The sensitivity of the calorimeter was determined to be 74 radians (rad) of phase shift per milliwatt of thermal power. One milliwatt of thermal power is equivalent ... continued below

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Rudy, C.; Bayliss, S.; Bracken, D.; Bush, J. & Davis, P. December 12, 1997.

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Description

A twin-bridge calorimeter using optical fiber as the sensor element was constructed and tested. This system demonstrates the principle and capability of using optical fibers for heat-flow measurements of special nuclear material. This calorimeter uses piezoelectric-generated phase-carrier modulation with subsequent electronic signal processes to allow phase shifts as small as 1 microradian ({micro}rad) to be measured. The sensing element consists of 21-m lengths of single-mode optical fiber wrapped around sample and reference chambers. The sensitivity of the calorimeter was determined to be 74 radians (rad) of phase shift per milliwatt of thermal power. One milliwatt of thermal power is equivalent to 400 mg of plutonium (6% {sup 240}Pu). The system noise base was about 0.2 rad, equivalent to about 1 mg of plutonium.

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Medium: P; Size: vp.

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INIS; OSTI as DE00763148

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  • Other Information: OSS Milestone Report

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  • Report No.: LA-UR-97-4176
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/763148 | External Link
  • Office of Scientific & Technical Information Report Number: 763148
  • Archival Resource Key: ark:/67531/metadc722962

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Creation Date

  • December 12, 1997

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

Description Last Updated

  • Feb. 25, 2016, 4:47 p.m.

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Rudy, C.; Bayliss, S.; Bracken, D.; Bush, J. & Davis, P. Fiber Optic Calorimetry, report, December 12, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc722962/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.