通过分析红外测温公式,研究物体发射率对红外热图像测温精度的影响,并找出影响物体发射率的因素。根据经典计算方法,发现了物体发射率在红外热图像测温应用中的局限。从红外热图像的角度对发射率的计算进行了建模,基于修正物体发射率得到提高红外热图像对非稳态温度场测量精度的模型。对铸铁、不锈钢进行了3组测温实验,红外热图像直接测量的最大误差分别为2.1℃、1.7℃、2.3℃,而所提出的方法测量的最大误差分别为1.0℃、0.7℃、1.6℃。通过对比分析3组测量结果数据验证了测量方法的可行性。
Abstract
By analyzing the formula of infrared temperature measurement, the influence of the object surface emissivity on the accuracy of infrared thermal image is studied. The factors affecting the emissivity of the object are found. According to the classical calculation method, the limitation of classical emissivity calculation method in infrared temperature measurement is explained. Based on the emissivity of the infrared image, a model of improving the temperature accuracy of the non-steady state temperature field is obtained, and a model is established, which is correction of emissivity of objects to improve the temperature measurement accuracy of infrared thermal image of non-steady temperature field. Three temperature measurement experiments of cast iron and stainless steel are carried out. The maximum errors of direct measurement of infrared thermal images are 2.1℃, 1.7℃ and 2.3℃ respectively, while the maximum errors of the proposed method are 1.0℃, 0.7℃ and 1.6℃ respectively.The correctness and feasibility of this method is verified by the experimental results.
关键词
计量学 /
红外热图像 /
非稳态温度场 /
发射率 /
测量精度 /
热辐射
Key words
metrology /
infrared thermal image /
non-steady temperature field /
emissivity /
measurement accuracy /
thermal radiation
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