A Method for Measuring Fabric Emissivity

摘要

Infrared emissivity is an important thermal character of fabrics. It indexes the infrared emissive power of fabrics, and it will also affect the measurement accuracy of the fabric surface temperature by using infrared thermal-imaging camera. Since the surface temperature of fabrics is hardly measured in a general way due to the interlace structure of fabrics and their thermal insulation character. This paper put forward a practical method for the measurement of fabric emissivity by using both the thermal imaging camera and the guarded hot plate. This method solve the problem of accurate testing of the fabric surface temperature by establishing Newton thermal transmittance relation for the air layer of the hot plate, thus the precise measurement of the fabric infrared emissivity by thermal-imaging camera will be possible. Experimental measurements on infrared emissivity of a group of fabrics with different materials and structures are performed; the testing results show that this method is valuable and applicable in the study of the infrared emissive performance of fabrics.