Acta Metrologica Sinica  2016, Vol. 37 Issue (3): 260-264    DOI: 10.3969/j.issn.1000-1158.2016.03.08
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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.
Key wordsmetrology      thermal diffusivity      infrared thermal imaging      curve fitting      nondestructive examination     
Received: 15 November 2014      Published: 22 March 2016
PACS:  TB94  
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WANG Xiao-na
LI Yang
HOU De-xin
YE Shu-liang
Cite this article:   
WANG Xiao-na,LI Yang,HOU De-xin, et al. A Rapid and Nondestructive Detection on the Thermal Diffusivity of Thin Materials Based on Thermography[J]. Acta Metrologica Sinica, 2016, 37(3): 260-264.
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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2016.03.08     OR     http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2016/V37/I3/260
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