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

摘要/Abstract

摘要：

针对旋转物体、移动部件或物体内部温度分布采集的问题,文中设计了一种小体积、精度高、低功耗的温度测量系统。该系统能无线传输数据并能温度数据多通道采集。系统采用PT100作为温度传感器,利用高一致性和低导通阻抗的多路模拟开关ADG888实现多路测量控制。软件上,通过建立铂阻值与ADC转换结果的修正函数,对PT100的整个信号链进行系统校准,获得准确的PT100阻值。在比较多种非线性处理方法并进行误差分析后,采用PT100的传递函数校正非线性误差,以获得高精度的测量值。经测试,温度多路采集系统在0~300 ℃的设计温度范围内可达到0.5 ℃的精度。

关键词: PT100, 温度多路采集, MAX31865, 无线传输, 上位机, 旋转物体

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

中图分类号:

TP212.9

周旋,师蔚. 低功耗高精度温度多路采集测温系统研究[J]. 电子科技, 2020, 33(8): 46-52.

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.

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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