3.2~3.4μm红外热像仪基于拟合的测温方法

Fitting-based temperature measurement for 3.2~3.4μm infrared thermal imager

研究目的为3.2~3.4μm窄波段红外热像仪的测温方法,本文从图像处理领域出发,利用红外热像仪和标准辐射源黑体,在一定的环境温度下,采集不同温度的黑体红外图像,通过数学建模软件对黑体图像进行灰度值计算,进而探究图像灰度值与温度的相关性,并基于最小二乘法和插值拟合思想构造黑体标定曲线,根据得到的标定曲线和已有的灰度值推出验证温度。经验证结果表明,测温精度有所提升,误差在0.49℃以内。

The purpose of this paper is to study the temperature measurement method of narrow band infrared camera.Firstly,starting from the field of image processing,an infrared thermal imager and a standard radiation source blackbody is used to collect blackbody infrared images at different temperatures at a certain ambient temperature.Then,the gray value of the blackbody image is calculated through mathematical modeling software and the correlation between the gray value and temperature is explored.Finally,the blackbody calibration curve is constructed based on the least squares method and interpolation fitting idea and the verification temperature is derived from the resulting calibration curve and the existing gray value.The validation results show that the temperature measurement accuracy has been improved,and the error is within 0.49℃.