Transient Response of an Intrinsic Thermocouple

[+] Author and Article Information
C. D. Henning, R. Parker

Mechanical Engineering Department, Weapons Division, Lawrence Radiation Laboratory, University of California, Livermore, Calif.

J. Heat Transfer 89(2), 146-152 (May 01, 1967) (7 pages) doi:10.1115/1.3614337 History: Received May 26, 1966; Online August 25, 2011


Where rapid heating is encountered, as in a prompt-burst nuclear reactor, a thermocouple with a rapid time-response is necessary to monitor the temperature of the specimen in question. Because all thermocouples have some mass, they cannot have an infinitely fast response. However, an intrinsic-type thermocouple has less thermal inertia than the usual welded-bead type. Thus it is a natural choice for the measurement of transient surface temperatures of conducting solids. In this report an analytical expression is obtained for the transient response of an intrinsic thermocouple. In support of the analysis, experimental data are presented which were obtained by means of a capacitor bank pulse-heating technique. It is concluded that thermocouple wires of small diameter and low thermal conductivity respond the fastest. As an example, a 1-mil constantan wire on a copper substrate produces 95 percent of the steady-state emf in 3 μsec.

Copyright © 1967 by ASME
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