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| A Rapid and Nondestructive Detection on the Thermal Diffusivity of Thin Materials Based on Thermography |
| WANG Xiao-na,LI Yang,HOU De-xin,YE Shu-liang |
| Institute of Industry and Trade Measurement Technique, China Jiliang University, Hangzhou, Zhejiang 310018, China |
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Abstract A novel measuring method which adapts to the thermal diffusivity of thin materials is proposed. It can solve the defects of traditional measurement method that has strict demands of the thermal excitation, boundary and the size of the materials. The method collects the changing temperature field data which caused by the laser heating on material surface by using the imaging technology, and estimates the differential terms from partial differential equation of heat conduction by curve fitting. The differential equation can be transformed into algebraic equation to determine the thermal diffusivity. The measuring experiment needs not to control the boundary condition, initial condition and thermal excitation strictly. The results of the simulation analysis verified the feasibility of the theoretical model. For measuring of the thermal diffusivity of H62 brass and 304 stainless steel and the deviation is less than 6.0% in comparison to the literature values and the measurement repeatability is 4.3%, so the method can satisfy the requirement of the rapid and nondestructive measurement.
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Received: 15 November 2014
Published: 22 March 2016
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2016, Vol. 37 
