基于热红外的真空绝热板真空度检测研究

Abstract

真空绝热板(VIP)主要是依靠其内部真空度来提高其绝热性能的,由于导热系数是表征真空绝热板绝热性能最重要的物性参数,准确测量出真空绝热板的导热系数,有助于将真空绝热板应用于需要绝热保温的场合并估算出其热负荷情况,为系统选择制冷设备或加热设备提供依据。在对真空绝热板真空度检测技术的研究中,本文致力于研究一种基于热红外技术的真空绝热板真空度检测方法,主要采用埋入热辐射器件、能量由外部无损耦合提供、使用红外热图像处理技术并结合电路控制系统等实现对真空绝热板的真空度检测。实验表明,红外检测技术用于测量真空度是可行的、检测速度快、检测结果可靠;对热红外检测技术的研究有利于推动国内真空度快速检测技术的发展。

A novel technique has been successfully developed to non-destructively evaluate the pressure in the vacuum insulation panel( VIP),fabricated on industrial scale.In the newly-developed technique,the heat radiation device,embedded in the VIP and energized in non-contact mode by the lab-built,external power-supply,is capable of emitting infrared( IR) light.The internal pressure can be indirectly estimated via data analysis of the spectrum and image acquired with a digital IR camera.The impact of the time evolution of the pressure on the IR image was experimentally and analytically simulated.The preliminary results show that the newly-developed,IR pressure-probe is feasible to measure rapidly the VIP pressure with high reliability.Further improvement of its measurement accuracy was under way.