红外热像仪的超高温度场测量技术研究

发布时间：2018-03-15 06:11

本文选题：红外　切入点：温度测量　出处：《中北大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着红外应用的扩展和探测器技术的发展,非制冷红外热像仪的测温功能得到越来越广泛的应用。红外热像仪为复杂环境中的超高温度场测量技术研究提供了崭新的思路。本文针对超高温度场测量的应用需求,在红外辐射测温理论基础上,分析实现红外测温的关键技术,建立红外热像仪测温物理模型,实现了长波红外热像仪的超高温度场测量,并且整合出完整的红外热像仪温度场测量系统,并进行现场实验,达到较好效果。围绕红外测温的特殊需求,分析热像仪得到的辐射量情况,推演出可实现红外热像仪温度测量的方法。针对测温需求,本课题选择定制一款长波非制冷红外热像仪作为研究对象,结合标准辐射源黑体搭建辐射定标平台,并进行定制的热像仪性能初探。实验发现采取该热成像系统在较低温度出现探测器饱和情况。为解决问题提出添加衰减装置红外衰减片的方案扩展探测器的饱和阈值,进一步进行定标实验。由于热成像系统积分时间可调,建立一种简便的辐射定标模型,实现一次定标完成全部积分时间的标定。为验证该模型的准确性,采取温度反演的方法计算测温误差,保证红外测温的精确度。考虑到红外热像仪的测温稳定性,进行相应的性能评估。结合红外热成像系统的性能评价标准,对定制红外热像仪的信号传递函数SiTF、噪声等效温差NETD、测温一致性和测温范围进行研究,测试结果证明该设备性能稳定,为该热像仪的使用和应用拓展提供了可参考的依据。针对温压炸药爆炸温度场测量的特殊性,建立野外的红外测温模型,进行热像仪的精确测温研究,并进行爆炸现场实验。为保证实验数据的准确性,采取待测温压PMX炸药和TNT参照实验的方法。为简化数据处理的繁琐操作,应用MATLAB开发专用的爆温测试数据处理软件。该软件以实时爆炸数据为依据,直观地显示爆炸超高温度场的测试参数,可方便溯源和进行二次开发,同时进一步拓展了热像仪的应用领域。
[Abstract]:With the expansion of infrared applications and the development of detector technology, The function of uncooled infrared thermal imager is more and more widely used. Infrared thermal imager provides a new idea for the research of ultra-high temperature field measurement technology in complex environment. This paper aims at the application demand of ultra-high temperature field measurement. Based on the theory of infrared radiation temperature measurement, the key technology of infrared temperature measurement is analyzed, and the physical model of infrared thermal imager is established, and the ultra-high temperature field measurement of long wave infrared thermal imager is realized. And integrated a complete infrared thermal imager temperature field measurement system, and carried out field experiments to achieve better results. Around the special requirements of infrared temperature measurement, the radiation obtained by the thermal imager is analyzed. This paper deduces the method of temperature measurement of infrared thermal imager. According to the requirement of temperature measurement, this subject chooses a long wave uncooled infrared thermal imager as the research object, and combines the blackbody of standard radiation source to build the radiation calibration platform. In order to solve the problem, the scheme of adding attenuator infrared attenuator to extend the saturation threshold of detector is put forward to solve the problem. Further calibration experiments are carried out. Because the integral time of thermal imaging system can be adjusted, a simple radiometric calibration model is established to realize the calibration of all integral time at one time. In order to verify the accuracy of the model, The temperature inversion method is adopted to calculate the temperature measurement error to ensure the accuracy of the infrared temperature measurement. Considering the stability of the infrared thermal imager, the corresponding performance evaluation is carried out, and the performance evaluation standard of the infrared thermal imaging system is combined. The signal transfer function (SiTF), the noise equivalent temperature difference (NETD), the consistency of temperature measurement and the range of temperature measurement of the custom infrared thermal imager are studied. The test results show that the performance of the device is stable. This paper provides a reference basis for the use and application of the thermal imager. In view of the particularity of the temperature field measurement of temperature and pressure explosive explosion, the infrared temperature measurement model in the field is established, and the accurate temperature measurement research of the thermal imager is carried out. In order to ensure the accuracy of experimental data, the method of PMX explosive and TNT reference experiment is adopted to simplify the complicated operation of data processing. This software is based on the real time explosion data and can display the test parameters of the explosion super-high temperature field intuitively, which can be easily traceable and secondary developed. At the same time, the application field of thermal imager is further expanded.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN21

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