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Steady-State and Frequency Response of a Thin-Film Heat Flux GaugeA new and simpler design of thin-film heat flux gauge has been developed for use In high-heat-flux environments. Heat flux gauges of the same design were fabricated on three different substrates and tested. The heat flux gauge comprises a thermopile and a thermocouple junction, which measures the surface temperature. The thermopile has 40 pairs of S-type thermocouples and is covered by two thermal resistance layers. Calibration and testing of these gauges were first carried out in an arc-lamp calibration facility. Sensitivity of the gauge was discussed in terms of the relative conductivity and surface temperature. The heat flux calculated from the gauge output was In good agreement with the precalibrated standard sensor. The steady-state and the transient response characteristics of the heat flux gauge were also investigated using a carbon dioxide pulse laser as a heat source. The dynamic frequency response was evaluated in terms of the nondimensional amplitude ratio with respect to the frequency spectrum of a chopped laser bcam. The frequency response of the gauge was determined to be about 3 kHz. The temperature profiles in the thin-film heat flux gauge were obtained numerically in steady-state conditions using FLUENT and compared with the experimental results.
Document ID
19990032572
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fralick, Gustave C.
(NASA Lewis Research Center Cleveland, OH United States)
Bhatt, Hemanshu D.
(National Academy of Sciences - National Research Council Cleveland, OH United States)
Cho, Chistopher S.
(University of Western Michigan Kalamazoo, MI United States)
Date Acquired
August 19, 2013
Publication Date
November 1, 1997
Publication Information
Publication: Journal of Spacecraft and Rockets
Publisher: American Institute of Aeronautics and Astronautics
Volume: 34
Issue: 6
Subject Category
Instrumentation And Photography
Funding Number(s)
PROJECT: RTOP 523-26-13-OD
CONTRACT_GRANT: NAG3-1669
Distribution Limits
Public
Copyright
Other

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