基于K型热电偶的中低温度测量系统的设计

Design of middle-and-low temperature measurement system based on K-type thermocouple

温度在工业领域应用非常广泛,而一般的温度传感器测量范围较窄,只能实现低温测量。K型热电偶是国内外仪器仪表行业中最常见的一种测温元件。本系统通过K型热电偶传感器对温度信号进行采集,MAX6675芯片对信号变换后,通过SPI串行接口与STM32F103RCT6单片机进行通信,实现中低温度的测量。为了实现较远距离控制,通过红外遥控模块输入对比温度,当测量温度大于或小于设定值时,进行声光报警。通过实验验证,本系统具有较高的精度,能满足中低温度的测量。

In industrial production , the temperature is one of the most important parameters , but the general temperature sensors can only measure the low temperature .The K thermocouple sensor is one of the most common temperature measuring devices in the domestic and foreign instrument industries .This system proposed can collect the temperature signal by the K thermocouple sensor ,change the signal by the MAX6675 ,then use serial data transmission of SPI interface to communication with STM 32F103RCT6 .In order to have long distance control ,this system has an alarm function by using infrared control module input temperature value , and comparing with the collected temperature and sound‐light . Experiments show this system has high precision that can measure the middle‐low temperature .