A new compensation scheme for thermistors and its implementation for response linearization over a wide temperature range

Author

Kaliyugavaradan, S. ; Sankaran, P. ; Murti, V.G.K.

Author_Institution

Sch. of Instrum. & Electron., Indian Inst. of Technol., Madras, India

Volume

42

Issue

5

fYear

1993

fDate

10/1/1993 12:00:00 AM

Firstpage

952

Lastpage

956

Abstract

A new four-constant curve fit is proposed for the R-T characteristic of a thermistor. That it provides a better fit than the two-constant law R=Ae^BT/ is demonstrated by taking the examples of two standard commercial thermistors. A simple numerical method is suggested for determining the constants of the new fit. Compared to other empirical relationships, the present equation lends itself to easy hardware linearization. A temperature-to-frequency converter that has been developed employing the proposed fit is described. The converter is free from any error due to thermistor lead resistances, and provides an accuracy better than 0.2 K over a temperature range from 300 K to 390 K

Keywords

compensation; curve fitting; linearisation techniques; thermistors; 300 to 390 K; R-T characteristic; compensation; four-constant curve fit; linearization; numerical method; operational amplifier; response linearization; temperature-to-frequency converter; thermistors; Circuits; Dynamic range; Equations; Hardware; Instruments; Temperature distribution; Temperature sensors; Thermal resistance; Thermistors; Transconductance;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.252535

Filename

252535