Measurement of the transient response of thermocouples and resistance thermometers using an in situ method. [LMFBR] | Zendy

R.M. Carroll | Zendy; R.L. Shepard | Zendy

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Measurement of the transient response of thermocouples and resistance thermometers using an in situ method. [LMFBR]

Author(s) -

R.M. Carroll,

R.L. Shepard

Publication year - 1977

Language(s) - English

Resource type - Reports

DOI - 10.2172/7221079

Subject(s) - thermocouple , transient (computer programming) , resistance thermometer , transient response , materials science , cooling curve , response time , current (fluid) , temperature measurement , mechanics , nuclear engineering , thermodynamics , electrical engineering , composite material , engineering , metallurgy , computer science , physics , computer graphics (images) , operating system

A loop-current step-response (LCSR) method was developed to measure, in situ, the transient response of temperature sensors, such as thermocouples and resistance thermometers. In this method, a sensor is heated with an electric current, and the time dependence of cooling is analyzed when the current is turned off. The cooling analysis is mathematically transformed into an equation to predict the transient response of the sensor to a change of external temperature. The method was verified for a limited class of sensors by comparing the predicted transient response with that measured after plunging the sensors into hot water. The transient responses of sheathed, insulated junction, Chromel/Alumel thermocouples of various diameters were measured with the sensing junction in flowing sodium at temperatures from 180 to 600/sup 0/C.

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