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本文介绍了热电偶时间常数的测试理论,提出了运用瞬态表面温度传感器动态校准系统实现对NANM AC热电偶时间常数的测试方法。该系统对红外探测器和热电偶进行了静态校准和动态校准,得到两者的温度-时间曲线。由于红外探测器的频率响应优于被校准热电偶的频率响应,因此,以红外探测器测得的值作为真值,用热电偶测得的值与红外探测器测得的值相比得到一条归一化的曲线,并由归一化曲线求得热电偶的时间常数。利用该方法对NANMAC热电偶进行时间常数的测试实验,得到了该热电偶的时间常数。实验结果表明:该时间常数测试方法是可行的,可以实现对微秒、毫秒量级热电偶的动态校准,这对于NANM AC热电偶温度传感器的研究和应用具有一定的参考价值。
This paper introduces the test theory of time constant of thermocouple, and proposes a method to test the time constant of NANM AC thermocouple by using the dynamic surface temperature sensor dynamic calibration system. The system of infrared detectors and thermocouples were static calibration and dynamic calibration, get the temperature-time curve of the two. Since the frequency response of the infrared detector is superior to the frequency response of the thermocouple being calibrated, the value measured by the infrared detector is taken as the true value, and the value measured by the thermocouple is compared with the value measured by the infrared detector Normalized curve, and obtained by the normalized curve thermocouple time constant. Using this method, the time constant of NANMAC thermocouple was tested and the time constant of the thermocouple was obtained. The experimental results show that the time constant test method is feasible and can realize the dynamic calibration of microsecond and millisecond thermocouples, which is of certain reference value for the research and application of NANM AC thermocouple temperature sensor.