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| Study on Non-steady Temperature Field Measurement ofInfrared Thermal Image under Different Emissivity |
| SHEN Jiu-li,ZHANG Yu-cun |
| College of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China |
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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.
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Received: 29 January 2018
Published: 01 September 2019
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2019, Vol. 40 
