Thermal Diffusivity Mapping of Solids by Scanning Photoacoustic Piezoelectric Technique
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Quantitative thermal diffusivity mapping of solid samples was achieved using the scanning photoacoustic piezoelectric (PAPE) technique. Based on the frequency-domain PAPE theoretical model, the methodology of the scanning PAPE thermal diffusivity mapping is introduced. An experimental setup capable of spatial and frequency scanning was established. Thermal diffusivity mapping of homogeneous and inhomogeneous samples was carried out. The obtained thermal diffusivity images are consistent with the optical images in image contrast and consistent with the reference values in thermal diffusivity. Results show that the scanning PAPE technique is able to determine the thermal diffusivity distribution of solids, hence providing an effective method for thermal diffusivity mapping.
KeywordsInhomogeneous materials Photoacoustic piezoelectric technique Thermal diffusivity mapping
This work was supported by the National Science Foundation of China (Nos. 61379013 and 61574030) and the Fundamental Research Funds for the Central Universities of China (Nos. ZYGX2012Z006 and ZYGX2015J151).
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