水流环境下温度传感器动态响应测量的不确定度评定

为满足核电快响应温度传感器的复验需要,研制了水流环境下温度传感器动态响应测量装置。分析了测量不确定度的来源,评定了时间常数测量结果的不确定度。通过提出微小时间域内电压示值与时间的线性关系,实现了不确定度由温度向时间参数的传递。对某核级快响应铂热电阻温度传感器的测量结果进行了不确定度评定,其时间常数扩展不确定度U=27ms(k=2)。评定结果表明:示波器光标读取电压和时间的分辨力是不确定度的重要来源,研究结果可为实验测量提供借鉴。

Uncertainty Evaluation on Temperature Sensor’s Dynamic Response Based on Water Facility

For nuclear fast response temperature sensor re-test, the calibration facility of temperature sensors dynamic response in flowing water was established. The calibration uncertainty of every factor was evaluated. In the small time region, approximate linearity between voltage and time exists, indicated by oscilloscope. Based on the approximation, uncertainty propagation was realized from temperature to time parameters. Uncertainty evaluation was conducted for a nuclear fast response platinum resistance temperature sensor’s calibration. The result showed that the expanded uncertainty of time constant was U=27ms (k=2). The oscilloscope cursor resolutions of voltage and time are the important factors for the uncertainty. The results can provide reference for the re-test procedure.