Research of Low Noise Analog Measurement on High Temperature Thermocouple Based on dsPIC33

Abstract:

Since thermocouple has an intrinsic disadvantage that its signal is very weak, many problems usually appear such as large noise and low temperature resolution when thermocouples are being used. Aiming this defect on thermocouple measurement, this paper proposes a solution of analog circuit design that provides the character of low noise and high SNR. This paper discusses the analog circuit design and calculation based on the S-type thermocouple which is often used for a very wide temperature range. This designed module can be applied to measurement instruments.

• Periodical: Advanced Materials Research (Volumes 816-817)
• Pages: 938-942
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.816-817.938
• Online since: September 2013
• Authors: Qi Feng Lin, Shu Yong Mou
• Keywords: Analog Signal Measurement, dsPIC33, Low Noise, Thermocouple

References

[1] Walt Kester, James Bryant, Walt Jung. Practical Design Techniques for Sensor Signal Conditioning, USA: ANALOG DEVICES, Chapter 7: 1-10, (1999).

[2] Matthew Duff, Joseph Towey. Two Ways to Measure Temperature Using Thermocouples Feature Simplicity, Accuracy, and Flexibility, Analog Dialogue, October , 44-10: 1-2, (2010).

[3] Texas Instruments. Noise Analysis in Operational Amplifier Circuits, USA: Texas Instruments, 2-3, 7 , (2007).

[4] Sergio Franco. Circuit design based on operational amplifier and analogue integrated circuit, The Third Edition. Translation: Liu Shutang. China: Xi'an Jiaotong University Press, 279-280(2004).