Solid State Science and Technology, Vol. 11, No 1 (2003) 51-58




Chia Pei Fung, W. Mahmood Mat Yunus, Zaidan Abdul Wahab, and Paridah Mohd Tahir

Department of Physics, Faculty of Science and Environmental Studies

Universiti Putra Malaysia, 43400 UPM, Serdang, Malaysia.

43400 Serdang, Selangor Darul Ehsan, Malaysia.



Two experimental arrangements have been used to measure the thermal diffusivity at room temperature  for  ten  species  of  Malaysian  wood  using  photoflash  and  photoacoustic  (PA) techniques.  Both  use  circular  disc  samples  with  thickness  1  to  2  mm  and  100  to  200  μm

respectively. In the photoflash experiment, a flash pulse is irradiated onto the front surface of the

sample. The time dependence of the temperature response at the back surface of the sample is measured using a K-type thermocouple. On the other hand, the PA experimental configuration uses a closed photoacoustic (PA) cell that serves as a pressure sensor as well as an acoustic chamber. It is based upon the measurement of the acoustic signal as a function of the modulation frequency in the region where the sample is thermally thick. Both experimental data are then used to calculate thermal diffusivity using appropriate analytical expressions. Scanning electron microscopy (SEM) observation has also been done on both radial and tangential surface of the samples. The results are in good agreement within experimental error, hence validating the experimental measurements.



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