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用红外热成象技术测量应变式压力传感器工作时的膜片温度分布,以判断由于电阻应变片工作时温度变化对测量准确性的影响。测量中为获得应变片的真实温度,作了表面喷黑处理。对于实用的3MPa和0.6MPa的压力传感器,在不同工作介质(空气和变压器油)及工作电压条件下进行了测量,其结果表明:应变片表面温度随工作电压增高而加大,且不均匀。以空气为介质的温度高于以变压器油为介质的温度。据此可以确定对压力测量准确度的影响。还用有限差分方法对压力传感器膜片表面温度作了数值分析计算。
Infrared thermography was used to measure the temperature distribution of the diaphragm during the operation of the strain gauge pressure sensor to determine the influence of the temperature change on the measurement accuracy due to the resistance strain gauge working. Measurement in order to obtain the true temperature of the strain gauge, made the surface spray black. For the practical 3MPa and 0.6MPa pressure sensors, the measurement was carried out under different working media (air and transformer oil) and operating voltage. The results show that the surface temperature of the strain gauge increases with the increase of working voltage and is not uniform. The temperature of air as a medium is higher than that of transformer oil. From this it is possible to determine the effect on the accuracy of the pressure measurement. The finite element method was also used to calculate the surface temperature of the pressure sensor diaphragm.