Thermoresistive radiation sensor response time employing electrical heating

Author

Deep, G.S. ; Neto, J.S.R. ; Lima, A.M.N. ; Freire, R.C.S. ; Lobo, P.C.

Author_Institution

UFPB/CCT/DEE, Campina Grande, Brazil

Volume

45

Issue

1

fYear

1996

fDate

2/1/1996 12:00:00 AM

Firstpage

332

Lastpage

335

Abstract

The thermal time constant (τ) of a thermoresistive sensor is defined in terms of its physical properties such as mass (m), specific heat (C), area (A), and overall heat transfer coefficient (U) to the surroundings. Measurement of c and U by direct calorimetric methods may involve lengthy experimental procedures. The time constant determination using electrical heating introduces measurement error. An analytical formulation to demonstrate the origin of this error and a procedure to eliminate the same and determination of the values of τ, UA, and mc, are presented. Sensitivity considerations for the choice of appropriate sensor heating currents to minimize some of the measurement errors are also discussed

Keywords

curve fitting; electric sensing devices; heat radiation; heat transfer; measurement errors; thermal variables measurement; Pt; analytical formulation; direct calorimetric methods; electrical heating; heat transfer coefficient; measurement error; physical properties; response time; sensitivity; thermal time constant; thermoresistive radiation sensor; Current measurement; Delay; Electric resistance; Electric variables measurement; Electrical resistance measurement; Heat transfer; Resistance heating; Temperature sensors; Thermal sensors; Thermoresistivity;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.481364

Filename

481364