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Signal processing method with cold junction compensation for thermocouple

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Thermocouple is a very popular and effective sensor for temperature measurement. But how to eliminate the interference of the temperature of cold junction is always a problem. A method based on recursive B-spline least-squares is proposed as a solution. The method establishes two models to convert the cold junction temperature to Electromotive Force (EMF) and the hot junction EMF to temperature respectively. And in the middle of them, the famous law of intermediate temperature is used to translate the measured EMF into the hot junction EMF. B-spline least-squares is adopted because of its great quality of approximation. Recursive approach is used to simplify the operation and make it suitable to be used in MPU. The simulate results show that the method is of high precision and stabilization whose average relative error is only 0.01% and has a powerful ability to reduce the nonlinearity of thermocouples.

Original languageEnglish
Title of host publication2009 IEEE Intrumentation and Measurement Technology Conference, I2MTC 2009
PublisherIEEE Computer Society
Pages1458-1462
Number of pages5
ISBN (Print)9781424433537
DOIs
StatePublished - 2009
Event2009 IEEE Intrumentation and Measurement Technology Conference, I2MTC 2009 - Singapore, Singapore
Duration: 5 May 20097 May 2009

Publication series

Name2009 IEEE Intrumentation and Measurement Technology Conference, I2MTC 2009

Conference

Conference2009 IEEE Intrumentation and Measurement Technology Conference, I2MTC 2009
Country/TerritorySingapore
CitySingapore
Period5/05/097/05/09

Keywords

  • B-spline least-squares
  • Cold junction compensation
  • Recursive approach
  • Thermocouple

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