【作者】 黄亮；

【导师】 郝晓剑；

【作者基本信息】 中北大学 ， 通信与信息系统， 2007， 硕士

【摘要】 传感器技术是现代信息技术的三大支柱之一,其水平的高低是衡量一个国家科技发展水平的重要标志。温度传感器作为传感器的重要分支,被广泛地用于精确测量和自动控制等领域,为了能够满足实时在线、快速和准确的温度测量,对温度传感器进行动态校准显得越来越重要。中北大学一直致力于瞬态表面温度传感器动态校准技术的研究,其研制的瞬态表面温度传感器动态校准系统近年来也在不断地改进和完善。该系统利用可高频调制的高功率CO2激光作为激励源,用脉冲激光加热被校传感器,表面产生一个快速升温的变化温度信号,用红外探测器测得的温度信号对被校传感器进行可溯源动态校准,由于红外探测器的频率响应特性优于被校传感器,因此以前者的响应作为参考值来校准后者并获取系统误差的修正值。用同一激光器发出的连续激光和脉冲激光在同一系统中进行红外探测器的静态校准和被校温度传感器动态校准,避免了因传感器安装环境差异及热物性的变化所产生的误差,解决了温度传感器动态校准的溯源难题。目前,该系统能对亚毫秒至秒量级时间常数的表面温度传感器进行动态校准,实验证明测试系统的动态重复性好,测试精度较高。利用该系统对美国OMEGA公司的CHAL-010型热电偶进行了动态校准实验,获得了该热电偶动态测温误差的修正值。在理论分析与实验研究的基础上,本文对蓝宝石光纤温度传感器测试系统静态特性参数K标定装置的改进也作了一些探索性的讨论:分析了作为加热热源的高功率CO2激光器的激光功率输出特性以及激光加热下金属传热体恒温区的稳定性,并且对作为金属传热体的锆金属内部温度分布进行了分析和ANSYS仿真,为静态特性参数K标定精度的提高提供了理论依据。更多还原

【Abstract】 The sensor technology is one of the three major pillars of the modern information technology, and its development level is one of the important symbols for weighing a nation’s scientific and technology development level. Temperature sensor is an important branch of sensor, it is frequently used in accurate or exact measurement and automation. To meet the needs of rapidly and precisely on-line measurement, dynamic calibration of temperature sensor is of great importance.North University of China carried on research on dynamic calibration of transient surface temperature sensor, and the dynamic calibration system developed by NUC is improved and optimized during the past few years. In the dynamic calibration system, a high frequency modulated high power CO2 laser is used as the driving source to heat up the sensor. On the surface a fast elevating temperature signal appears. Using the temperature signal obtained by IR detector traceable high-temperature dynamic calibration can be carried through.The frequency-response characteristics of the former surpass that of the latter, therefore it can be used as the reference value to calibrate the latter and let system error be corrected. Using the continual beam and the pulsed beam sent out by the same laser in the same system to carry on the static calibration of the infrared detector and the dynamic calibration of the temperature sensor to be checked, the differences in the environment of the sensor installing and the error caused by the change of thermo physical property can be avoided. Thus the difficult problem of traceable temperature dynamic calibration is solved.At present, the calibration system can be used to calibrate transient surface temperature sensor with a time response of the sub-millisecond level and second level. The experimental results have shown that the dynamic repeatability is good, the precision of measurement is high. We get the CHAL-010 type(OMEGA) thermocouple’s error of dynamic temperature measurement by using the calibration system.The improving calibration system of sapphire optical fiber temperature sensor test system’s K static characteristic parameter is discussed on the basis of theoretical and experimental studies. The output power characters of high power CO2 laser and stability of the heat-transfer metal’s constant temperature field by laser heating are analyzed in the thesis, temperature distribution of zirconium metal is also analyzed and studied by using ANSYS simulation. The analysis and studies provide theoretical basis for the improving of calibration precision.更多还原