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 processing to allow phase shifts as small as 1 {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 rad of phase shift per mW of thermal power. One milliwatt of thermal power is equivalent to 400 ... continued below

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6 p.

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Rudy, C.R.; Bayliss, S.C.; Bracken, D.S.; Bush, I.J. & Davis, P.G. December 31, 1998.

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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 processing to allow phase shifts as small as 1 {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 rad of phase shift per mW 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.

Physical Description

6 p.

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INIS; OSTI as DE99001822

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  • 39. Institute of Nuclear Materials Management (INMM) annual meeting, Naples, FL (United States), 26-30 Jul 1998

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  • Other: DE99001822
  • Report No.: LA-UR--98-2840
  • Report No.: CONF-980733--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/563803 | External Link
  • Office of Scientific & Technical Information Report Number: 319736
  • Archival Resource Key: ark:/67531/metadc677069

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  • December 31, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 25, 2016, 4:46 p.m.

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Rudy, C.R.; Bayliss, S.C.; Bracken, D.S.; Bush, I.J. & Davis, P.G. Fiber optic calorimetry, article, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc677069/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.