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Title: Fiber Optic Calorimetry

Abstract

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.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
USDOE Office of Nonproliferation and National Security (NN) (US)
OSTI Identifier:
763148
Report Number(s):
LA-UR-97-4176
TRN: US0100393
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Technical Report
Resource Relation:
Other Information: OSS Milestone Report; PBD: 12 Dec 1997
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CALORIMETERS; CALORIMETRY; FIBER OPTICS; HEAT FLUX; MODULATION; OPTICAL FIBERS; PHASE SHIFT; PLUTONIUM; SENSITIVITY

Citation Formats

Rudy, C., Bayliss, S., Bracken, D., Bush, J., and Davis, P.. Fiber Optic Calorimetry. United States: N. p., 1997. Web. doi:10.2172/763148.
Rudy, C., Bayliss, S., Bracken, D., Bush, J., & Davis, P.. Fiber Optic Calorimetry. United States. doi:10.2172/763148.
Rudy, C., Bayliss, S., Bracken, D., Bush, J., and Davis, P.. Fri . "Fiber Optic Calorimetry". United States. doi:10.2172/763148. https://www.osti.gov/servlets/purl/763148.
@article{osti_763148,
title = {Fiber Optic Calorimetry},
author = {Rudy, C. and Bayliss, S. and Bracken, D. and Bush, J. and Davis, P.},
abstractNote = {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.},
doi = {10.2172/763148},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 12 00:00:00 EST 1997},
month = {Fri Dec 12 00:00:00 EST 1997}
}

Technical Report:

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