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

Sidney B. Lang, Erling Ringgaard, Supasarote Muensit, Xiaoqing Wu, Jason C. Lashley, Yuen Wah Wong

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

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.

Original languageEnglish
Article number4430051
Pages (from-to)2608-2615
Number of pages8
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume54
Issue number12
DOIs
StatePublished - 1 Dec 2007

ASJC Scopus subject areas

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

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