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Vol. 100, Issue 1, January 2009, pp.1-10





A Log Amplifier Based Linearization Scheme for Thermocouples


1Nikhil MONDAL, 2A. ABUDHAHIR, 3Sourav Kanti JANA,


1Electrical Engineering Department, Jadavpur University, Kolkata-700032, India

2 National Engineering College, Kovilpatti-628503, India

3Physics Department, Jadavpur University, Kolkata-700032, India

Fax: +913324146184

E-mail: sugatamunshi@yahoo.com



Received: 22 October 2008   /Accepted: 19 January 2009   /Published: 26 January 2009


Abstract: This paper presents a new analog linearization circuit for thermocouple temperature sensors. The proposed circuit employs the linearizing action inherent in logarithmic operation, as well as the ratiometric property of op-amp based logarithmic amplifier compensated against variation in ambient temperature. Numerical and PSPICE simulation studies have been carried out using the standard data for T, J and G type thermocouples. Encouraging results have been obtained.


Keywords: Thermocouple, Temperature-sensor, Linearization, Log-Amplifier


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