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Vol. 87, Issue 1, January 2008, pp.24-30




A Modified Design of a Thermocouple Based Digital Temperature Indicator  with Opto-Isolation


S. C. BERA and D. N. KOLE

Instrumentation Engineering Section, Applied Physics, University of Calcutta,

92, Acharya Prafulla Chandra Road, Kolkata - 700 009, W.B. India

E-mail: scb152@indiatimes.com, dnkoley@yahoo.com



Received: 11 January 2007   /Accepted: 23 January 2008   /Published: 28 January 2008


Abstract: In the conventional thermocouple based digital temperature indicator the millivolt signal obtained from a thermocouple is first amplified and then converted into a digital signal by using analog-to-digital converter (ADC). This digital signal is then indicated as digital display of temperature using digital counter circuit or microprocessor/microcontroller based circuitry. In the present paper a modified AD conversion technique along with opto-isolation is used to indicate digitally the temperature without using any conventional analog-to-digital converter. The theory and design of the measuring technique are described in the paper. The non-linearity of thermocouple is eliminated by using look-up table within software program. The performance of the circuit has been experimentally tested by using mV input signal instead of a thermocouple as well as using a K-type thermocouple. The experimental results are reported in the paper.


Keywords: Opto-isolation, Temperature measurement, Thermocouple, LED, LDR


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