Thermal diffusivity determination of solids by time-domain photoacoustic piezoelectric technique  

作　　者：Binxing Zhao Yafei Wang Chunming Gao Qiming Sun 

机构地区：[1]School of Opto-Electronic Information, University of Electronic Science and Technology of China

出　　处：《Chinese Science Bulletin》2014年第26期3348-3351,共4页

基　　金：supported by the National Natural Science Foundation of China (50506006 and 61379013);the Fundamental Research Funds for the Central Universities of China (E022050205 and ZYGX2012Z006)

摘　　要：Thermal–physical property is one of the most important properties of materials. The conventional frequency-domain photoacoustic piezoelectric(PAPE) technique has been developed as an important method for thermal diffusivity determination. In this paper, the PAPE technique is extended to time domain(TD). First, based on a simplified thermoelastic model, the TD PAPE theory under square-wave-modulated excitation was developed,the dependence of the TD PAPE signal on modulation frequency as well as material parameters was obtained, and the determination of thermal diffusivity was simulated and theoretically analyzed. Second, the experimental system and the corresponding measurement method were established. Third, thermal diffusivities of various standard samples, such as copper, aluminum, and nickel, were measured, and the effectiveness of the technique was verified. The results show that the TD PAPE technique can provide a simple, fast and effective way for thermal diffusion study.Thermal-physical property is one of the most important properties of materials. The conventional fre- quency-domain photoacoustic piezoelectric （PAPE） tech- nique has been developed as an important method for thermal diffusivity determination. In this paper, the PAPE technique is extended to time domain （TD）. First, based on a simplified thermoelastic model, the TD PAPE theory under square-wave-modulated excitation was developed, the dependence of the TD PAPE signal on modulation frequency as well as material parameters was obtained, and the determination of thermal diffusivity was simulated and theoretically analyzed. Second, the experimental system and the corresponding measurement method were established. Third, thermal diffusivities of various standard samples, such as copper, aluminum, and nickel, were measured, and the effectiveness of the technique was verified. The results show that the TD PAPE technique can provide a simple, fast and effective way for thermal diffusion study.

关 键 词：扩散系数测定 压电技术 光声 时域 热物理性质 热扩散率 固体 材料参数 

分 类 号：O552.2[理学—热学与物质分子运动论]