摘要
为适应不同环境下不同测温范围不同测温准确度的要求,实现高准确度温度测量,设计一种基于多传感器的自动识别测温仪。系统以低功耗处理器MSP430为核心,采用PT1000、DS18B20、Tsic506温度传感器,完成3种传感器的高准确度高分辨率测温与自动识别,并在LCD屏显示当前传感器的温度值。采用四线制PT1000测量方法减少引线误差,采用中值平均滤波减少随机误差和查表法降低非线性误差,实现PT1000的高准确度温度测量。设计高效率低功耗的电源模块,为各模块工作提供可靠的电源,可在2节5号电池下持续工作100 h。实验结果表明,系统的测量范围为-100-500℃,PT1000可以完成整个温度的测量,在-100-100℃测量准确度为0.1℃,准确度高,适用范围广。DS18B20可以完成-55-125℃温度的测量,准确度为0.5℃,价格低廉。Tsic506可以完成-50-150℃的温度测量,准确度为0.1℃,准确度高,速度快。用户可以根据不同的需要选择不同的传感器,完成温度的高准确度测量。
In order to adapt to the temperature measurement requirements of different surface depths in different environments and achieve high-precision temperature measurement,an automatic recognition thermo detector on the base of multi-sensor has been designed. In the investigation,basing on the low power CPU MSP430, three temperature sensors——PT1000, DS18B20,Tsic506, was used to achieve the requirements of high-precision temperature measurement and automatic recognition. The active sensor and temperature value can be displayed in LCD screen.To realize the high accuracy measurement of PT1000, PT1000 four-wire measurement method,median-value filter method and look-up table method was used to reduce the lead error,random error and nonlinearity error, respectively. While a high efficiency and low power consumption module was designed to provide a reliable power supply for each module,which can support the system to work for 100 hours continuously with two AA batteries. The results show that the system can measure the temperature from-100 ℃ to 500 ℃. The PT1000 can achieve the measurement of the whole temperature range and the accuracy can reach 0.1 ℃, when the temperature changing from-100 ℃ to 100 ℃ with high precision, wide application scope. DS18B20 and Tsic506 can successfully measure the temperature of-55 ℃ to 125 ℃ with a 0.5 ℃ precision and-50 ℃ to150 ℃ with a 0.1 ℃ precision, respectively. The user can implement measurement of high precision temperature according to different needs by choosing different sensors.
出处
《中国测试》
CAS
北大核心
2016年第5期70-74,共5页
China Measurement & Test
基金
国家自然科学基金(41474158)
国防预研项目(404070201)
中央高校基本科研业务费专项资金项目(CUG110822)
