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Frequency response of a thermocouple wire: Effects of axial conductionTheoretical expressions are derived for the steady-state frequency response of a thermocouple wire. In particular, the effects of axial heat conduction are demonstrated for both a uniform thermocouple wire and a nonuniform wire with unequal material properties and wire diameters across the junction. For the case of a uniform wire, the amplitude ratio and phase angle compare favorably with the series solution of Scadron and Warshawsky (1952) except near the ends of the wire. For the case of a non-uniform wire, the amplitude ratio at low frequency omega yields 0 agrees with the results of Scadron and Warshawsky for a steady-state temperature distribution. Moreover, the frequency response for a non-uniform wire in the limit of infinite length l yields infinity is shown to reduce to a simple expression that is analogous to the classic first order solution for a thermocouple wire with uniform properties.
Document ID
19900019511
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Forney, L. J. (Georgia Inst. of Tech. Atlanta., United States)
Fralick, G. C. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1990
Subject Category
Instrumentation And Photography
Report/Patent Number
NAS 1.26:180454
E19-666-1
NASA-CR-180454
Accession Number
90N28827
Funding Number(s)
CONTRACT_GRANT: NCC3-135
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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