低功耗高精度温度多路采集测温系统研究

doi:10.16180/j.cnki.issn1007-7820.2020.08.008

Abstract

Abstract:

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

ZHOU Xuan,SHI Wei. Research on Low Power and High Precision Temperature Multichannel Acquisition Technology[J].Electronic Science and Technology, 2020, 33(8): 46-52.

Figures/Tables 10

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References 16

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标准温度 /℃	接入电阻值 /Ω	实测电阻值 /Ω	实测温度 /℃	误差/℃
0	100.00	100.00	0.00	0.00
30	111.67	111.69	30.04	0.04
60	123.24	123.27	60.07	0.07
90	134.71	134.76	90.13	0.13
120	146.07	146.11	120.11	0.11
150	157.33	157.38	150.15	0.15
180	168.48	168.51	180.09	0.06
210	179.53	179.60	210.20	0.20
240	190.47	190.53	240.15	0.15
270	201.31	201.41	270.27	0.27
300	212.05	212.18	300.39	0.39

Research on Low Power and High Precision Temperature Multichannel Acquisition Technology

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