A blackbody optical fiber thermometer consists of an optical fiber whose sensing tip is given a metallic coating. The sensing tip of the fiber forms an isothermal cavity and the emission from this cavity is approximately equal to the emission from a blackbody. When a short length of the fiber is exposed to a high temperature environment, the temperature at the sensing tip can be inferred using the standard two-color approach. If, however, more than a short length of the fiber is exposed to elevated temperatures, emission by the fiber will result in erroneous temperature measurements. This paper presents experimental results that show it is possible to use additional spectral measurements to eliminate errors due to emission by the fiber and measure the tip temperature. In addition, the technique described in this paper can be used to obtain an estimate of the temperature profile along the fiber.
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e-mail: dbarker@byu.edu
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Temperature Measurements Using a High-Temperature Blackbody Optical Fiber Thermometer
David G. Barker,
e-mail: dbarker@byu.edu
David G. Barker
Department of Mechanical Engineering, Brigham Young University, 435 CTB, PO Box 24201, Provo, UT 84602-4201
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Matthew R. Jones
e-mail: mrjones@et.byu.edu
Matthew R. Jones
Department of Mechanical Engineering, Brigham Young University, 435 CTB, PO Box 24201, Provo, UT 84602-4201
Search for other works by this author on:
David G. Barker
Department of Mechanical Engineering, Brigham Young University, 435 CTB, PO Box 24201, Provo, UT 84602-4201
e-mail: dbarker@byu.edu
Matthew R. Jones
Department of Mechanical Engineering, Brigham Young University, 435 CTB, PO Box 24201, Provo, UT 84602-4201
e-mail: mrjones@et.byu.edu
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division September 25, 2002; revision received February 4, 2003. Associate Editor: S. T. Thynell.
J. Heat Transfer. Jun 2003, 125(3): 471-477 (7 pages)
Published Online: May 20, 2003
Article history
Received:
September 25, 2002
Revised:
February 4, 2003
Online:
May 20, 2003
Citation
Barker, D. G., and Jones, M. R. (May 20, 2003). "Temperature Measurements Using a High-Temperature Blackbody Optical Fiber Thermometer ." ASME. J. Heat Transfer. June 2003; 125(3): 471–477. https://doi.org/10.1115/1.1571085
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