真空热试验数字温度测量系统设计与实现

Design and implementation of digital temperature measurement system in vacuum thermal test

摘要:

温度测量是航天器真空热试验中一项非常重要的测量项目,一般采用热电偶进行温度测量。为了在真空热试验过程中减少测量线路的引线数量、提高测量系统的抗干扰程度以及测量准确度高,设计了一种可用于真空热试验的数字温度测量系统,实现了对航天器及地面工装设备温度的数字化测量。该系统由数字温度传感器DS18B20以及采集设备组成,可通过LAN网络与远程监视计算机连接实现温度远程监视。文章给出了数字温度测量系统的硬件结构、通信协议以及软件设计。通过在真空热环境中的测试以及与铂电阻测温系统的比对,结果表明该系统的稳定性好,其测量值与铂电阻测量值的差值在0.5℃以内,满足真空热试验的需求。

Abstract:

Temperature measurement is a very important measurement project in spacecraft vacuum thermal test, and thermocouple measurement system is generally used for temperature measurement. In order to reduce the number of wire measuring circuit and improving the measurement system of anti disturbance and high measurement accuracy in vacuum thermal test process, which can be used in digital temperature measurement system of vacuum thermal test design, realizes the digital temperature measuring equipment of spacecraft and ground equipment. The system is composed of digital temperature sensor DS18B20 and acquisition device. It can be connected with remote monitoring computer through LAN network to realize remote monitoring of temperature. The hardware structure, communication protocol and software design of the digital temperature measurement system are given in this paper. The vacuum thermal environment test and comparison with the platinum resistance temperature measurement system. The results show that the stability of the system is good and the difference between the measured value and the platinum resistance measurement is within 0.5 ℃, which satisfies the requirement of vacuum thermal test.