Temperature recovery from degenerated infrared image based on the principle for temperature measurement using infrared sensor
Temperature recovery from degenerated infrared image based on the principle for temperature measurement using infrared sensor
复制标题
基于红外传感器测温原理的退化红外图像温度恢复
DOI：
10.1063/1.4863783
复制
发表时间：
2014-01
影响因子：
3.2
通讯作者：
Zhao, Xinyu
中科院分区：
文献类型：
--
作者：
Hu, Yihua;Gao, Bin;Woo, W. L.;Zhao, Xinyu
热像仪已应用于光伏（PV）阵列监测中以检测缺陷和热点。然而，红外 (IR) 图像通常会退化，并且图像中显示的温度信息可能会导致错误的解释。监控大型光伏阵列时，热点会被遮挡，并会出现渐变现象。本文对红外图像退化和渐变现象的机理进行了研究，并通过实验进行了验证。大气传输和定向发射率的变化已被确定为图像退化的原因。定义大气透射率和定向发射率的灵敏度，分析这两个因素对温度显示的影响。基于这种机制，提出了一种从退化的红外图像中恢复真实温度的恢复方法。进行了实验来测试回收方法的有效性。此外，还定义了温度灵敏度，以分析大气透射率和定向发射率将如何影响红外图像中显示的温差。所提出的温度灵敏度已被用作评估红外图像质量的标准。提出了一些部署热像仪的经验法则，以提高红外图像的质量。
Thermal camera has been applied in photovoltaic (PV) array monitoring to detect defects and hot spots. However, the infrared (IR) image is often degenerated and the temperature information displayed from the image can lead to erroneous interpretation. Hot spots will be obscured and a gradual change phenomenon will emerge when monitoring a large PV array. In this paper, the mechanism of IR image degeneration and gradual change phenomenon are studied and verified with experiments. The variations of atmospheric transmission and directional emissivity have been identified to be the cause of image degeneration. The sensitivity of atmospheric transmission and directional emissivity are defined to analyze the impact of these two factors on the temperature displayed. Based on this mechanism, a recovery method has been proposed to recover the real temperature from the degenerated IR image. Experiments have been conducted to test the effectiveness of the recovery method. In addition, the temperature sensitivity has been defined to analyze how atmospheric transmission and directional emissivity will affect the temperature difference displayed in the IR image. The proposed temperature sensitivity has been used as the criteria to assess the quality of IR image. Some rules of thumb are proposed to deploy the thermal camera in order to increase the quality of the IR image.
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