A method to quickly test the emissivity with an infrared thermal imaging system within a small distance

Xuan-yu Wang; Rui Hu; Rui-xin Wang

doi:10.1117/12.2197994

8 October 2015 A method to quickly test the emissivity with an infrared thermal imaging system within a small distance

Xuan-yu Wang, Rui Hu, Rui-xin Wang

Proceedings Volume 9677, AOPC 2015: Optical Test, Measurement, and Equipment; 96770O (2015) https://doi.org/10.1117/12.2197994
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

A simple method has been set up to quickly test the emissivity with an infrared thermal imaging system within a small distance according to the theory of measuring temperature by infrared system, which is based on the Planck radiation law and Lambert-beer law. The object’s temperature is promoted and held on by a heater while a temperature difference has been formed between the target and environment. The emissivity of human skin, galvanized iron plate, black rubber and liquid water has been tested under the condition that the emissivity is set in 1.0 and the testing distance is 1m. According to the invariance of human’s body temperature, a testing curve is established to describe that the thermal imaging temperatures various with the emissivity which is set in from 0.9 to 1.0. As a result, the method has been verified. The testing results show that the emissivity of human skin is 0.95. The emissivity of galvanized iron plate, black rubber and liquid water decreases with the increase of object’s temperature. The emissivity of galvanized iron plate is far smaller than the one of human skin, black rubber or water. The emissivity of water slowly linearly decreases with the increase of its temperature. By the study, within a small distance and clean atmosphere, the infrared emissivity of objects may be expediently tested with an infrared thermal imaging system according to the method, which is promoting the object’s temperature to make it different from the environment temperature, then simultaneously measures the environmental temperature, the real temperature and thermal imaging temperature of the object when the emissivity is set in 1.0 and the testing distance is 1.0m.

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Xuan-yu Wang, Rui Hu, and Rui-xin Wang "A method to quickly test the emissivity with an infrared thermal imaging system within a small distance", Proc. SPIE 9677, AOPC 2015: Optical Test, Measurement, and Equipment, 96770O (8 October 2015); https://doi.org/10.1117/12.2197994

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KEYWORDS

Thermography

Temperature metrology

Infrared radiation

Infrared imaging

Imaging systems

Iron

Atmospheric particles

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