一种用于热电阻传感器校准的新型温场的研究

Research on a New Temperature Field for Calibration of Thermal Resistance Sensors

目前热电阻温度传感器的校准主要通过恒温槽提供温场,可将传感器直接浸入槽液中,亦可将其置于玻璃套管中插入槽液中。使用此类温场时,会造成传感器和槽液相互污染或需大量时间使传感器读数达到稳定的情况。本文通过使用内部空间较大的不锈钢套管替代常规使用的细长玻璃套管,并在不锈钢套管中注满小铜珠,重新构建一个到温速度快且不易污染传感器的均匀温场,并对其在不同校准温度点的温度均匀性及温度波动性进行研究。实验结果显示,此温场技术指标满足热电阻传感器的校准要求。

At present,the calibration of thermal resistance temperature sensors mainly provides the temperature field through the constant temperature tank,which can directly immerse the sensor in the tank liquid,and can also be placed in the glass casing to insert the tank liquid. When using this kind of temperature field,the liquid phase of the sensor and the tank will be polluted each other or it will take a lot of time to stabilize the sensor reading. In this paper,a stainless steel sleeve with large internal space is used to replace the conventional slender glass sleeve,and small copper beads are filled in the stainless steel sleeve. The uniform temperature field of the sensor is reconstructed,which is fast to temperature and not easy to pollute. The temperature uniformity and temperature fluctuation at different calibration temperature points are studied. The experimental results show that the temperature field meets the calibration requirements of the thermal resistance sensor.