航天器热电偶检测系统的设计与实现

Design and Realization of Spacecraft Thermocouple Detecting System

摘要:

热电偶测温广泛应用于航天器真空热试验的温度测量中,目前对于航天器总装阶段的热电偶实施没有一种快速有效的方法进行正确性验证;传统依靠人手触摸测点观察热电偶阻值变化方法存在一定的局限性,为了提高热电偶检测的准确性和有效性,设计了一种便携式的热电偶检测系统,实现了对热电偶短路、开路和粘贴位置正确性的检测;基于MAX31855的温度采集模块可以快速采集和显示热电偶温度,加热模块的出风口温度控制和加热温度限制能够保证检测过程中航天器的安全性;实际测试表明,该系统具备在现场灵活对航天器表面热电偶进行检测的能力,测试效率高,具有很高的实用性。

Abstract:

Thermocouple is widely used in the temperature measurement of spacecraft thermal vacuum test. At present, there is no quick and effective method for verifying the thermocouple implementation during the assembly stage. The method which relying on using human hand to touch the measuring point and observing the thermocouple resistance change has some limitations. In order to improve the accuracy and effectiveness of thermocouple detection, a portable thermocouple detection system was designed to detect short circuit, open circuit and the correctness of paste position of thermocouple. The temperature acquisition module based on MAX 31855 can quickly acquire and display thermocouple temperature. The outlet temperature control and heating temperature limits of the heating module ensure the safety of spacecraft during the detecting process. The test shows that the detecting system has the ability to detect the thermocouple on the surface of the spacecraft with flexibility, high test efficiency and high practicability.