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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Thermal diffusivity by laser intensity modulation method (LIMM-TD): a novel technique for the determination of thermal diffusivities and conductivities and its application to porous PZT and silica samples
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Thermal diffusivity by laser intensity modulation method (LIMM-TD): a novel technique for the determination of thermal diffusivities and conductivities and its application to porous PZT and silica samples

机译：激光强度调制法（LIMM-TD）的热扩散率：一种测定热扩散率和电导率的新技术及其在多孔PZT和二氧化硅样品中的应用

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摘要

A modification of a technique for the measurement of the thermal diffusivity of thin solid materials is presented. The technique is called thermal diffusivity by laser intensity modulation method (LIMM-TD). It is based on the measurement of the phase retardation of a thermal wave passing through the test material by means of a lead-zirconate-titanate ceramic (PZT) pyroelectric detector. It is not necessary to know either the pyroelectric coefficient of the detector or the intensity of the laser beam. The method was tested on quartz samples to verify its accuracy. It was then applied to the study of several sets of ceramic samples with porosities of 20, 25, and 30%. One sample set was poled and the pores were partially filled with the fluid used during poling. A second set was not poled. The poled porous samples had thermal conductivities intermediate between that of a commercial dense sample and those of unpoled materials. Thermal diffusivities and conductivities were also measured on micron-thickness porous silica samples. The experimental results were compared with calculations using several composite mixing theories.
机译：提出了一种用于测量薄固体材料的热扩散率的技术的改进。该技术被称为通过激光强度调制方法（LIMM-TD）的热扩散率。它基于通过锆钛酸铅陶瓷（PZT）热释电探测器对通过测试材料的热波的相位延迟的测量。既不必知道检测器的热电系数，也不必知道激光束的强度。该方法在石英样品上进行了测试，以验证其准确性。然后将其用于研究孔隙率为20％，25％和30％的几组陶瓷样品。将一组样品极化，并在孔中部分填充极化过程中使用的流体。第二盘没有两极。极化多孔样品的热导率介于商品密集样品的热导率和未极化材料的热导率之间。还对微米厚度的多孔二氧化硅样品测量了热扩散率和电导率。使用几种复合混合理论将实验结果与计算结果进行了比较。

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