Three-Wire Thermocouple: Frequency Response in Constant Flow

Theory and experimental measurements are compared with a novel three-wire thermocouple. Signals from three wires of unequal diameters are recorded from the thermocouple suspended in constant flow with a periodic temperature fluctuation. It is demonstrated that the reconstructed signal from the three...

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Published in:Review of scientific instruments 1995-05, Vol.66 (5), p.3331-3336
Main Authors: Forney, L. J., Fralick, G. C.
Format: Article
Language:English
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Instrumentation And Photography
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description Theory and experimental measurements are compared with a novel three-wire thermocouple. Signals from three wires of unequal diameters are recorded from the thermocouple suspended in constant flow with a periodic temperature fluctuation. It is demonstrated that the reconstructed signal from the three-wire thermocouple requires no compensation for omega less than or equal to 5(omega(sub 1)), where omega(sub 1) is the natural frequency of the smaller wire. The latter result represents a significant improvement compared to previous work with two-wire thermocouples. A correction factor has also been derived to account for wires of arbitrary diameter.
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subjects Instrumentation And Photography
title Three-Wire Thermocouple: Frequency Response in Constant Flow
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