Electronic Science and Technology ›› 2020, Vol. 33 ›› Issue (8): 46-52.doi: 10.16180/j.cnki.issn1007-7820.2020.08.008

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Research on Low Power and High Precision Temperature Multichannel Acquisition Technology

ZHOU Xuan,SHI Wei   

  1. School of Urban Rail Transportation,Shanghai University of Engineering Science,Shanghai 201620,China
  • Received:2019-05-17 Online:2020-08-15 Published:2020-08-24
  • Supported by:
    Key Research Program of The Ministry of Science and Technology during the 13th Five-year(2016YFB01700)


A temperature measuring system, characterized by small size, high accuracy, low consumption, was designed in this paper. This measuring system can achieve wireless data transmission and temperature multi-channel acquisition in order to satisfy the measuring need in rotating objects, moving parts or objects installed the temperature distribution systems. The PT100 was used as temperature sensor, and the multi-channel analog switch ADG888 with high consistency and low on-resistance was used to achieve multi-channel measuring control. The correction function, correcting the data between resistance value and ADC conversion,was established via the specific software and the whole signal chain of PT100 was systematically calibrated so that the accurate resistance value of PT100 could be obtained. After comparing various nonlinear processing methods and analyzing their own error, the transfer function of PT100 was used to correct the nonlinear error in order to obtain high accuracy measured value. The temperature multi-channel acquisition system could reach the accuracy of 0.5 ℃ in the temperature range of 0~300 ℃.

Key words: PT100, temperature multi-channel acquisition, MAX31865, wireless transmission, host computer, rotating object

CLC Number: 

  • TP212.9