 Back
Research Article
ScienceAsia 32 (2006): 047-052 |doi: 10.2306/scienceasia1513-1874.2006.32.047
Measurement of Thermal Parameter using
Non-Contact Photopyroelectric Method
Azmi Zakaria,a* Liaw Hock Sang,b Zulkifly Abbas,a Wan Mahmood Mat Yunusa and Jumiah
Hassana
ABSTRACT: In the standard photopyroelectric technique, a precise control of thermal coupling fluid between
the solid sample and the sensor is sometimes difficult, and yet an important factor in sample characterization.
In this paper, we propose a non-contact photopyroelectric configuration for thermal diffusivity measurement
of solids by considering the phenomena of thermal wave interference. We adopted the thermal wave
interferometry, which was extensively discussed by Bennett and Patty in the photoacoustic signal generation,
to our photopyroelectric signal generation in a thermally thick condition for a nondestructive testing. A
normalization procedure has been used to eliminate a number of media parameters of photopyroelectric cell
that otherwise needed to be known before one can determine thermal diffusivity of the sample. The thermal
diffusivities obtained for Al, Cu, and Ni samples were close to literature values and thus justified the proposed
model.
Download PDF
a Photoacoustic Laboratory, Department of Physics, Universiti Putra Malaysia, 43400 Serdang, Selangor,
Malaysia.
b College of Engineering, Universiti Tenaga Nasional, 43009 Kajang, Selangor, Malaysia.
* Corresponding author, E-mail: azmizak@fsas.upm.edu.my
Received 31 Mar 2005, Accepted 22 Aug 2005
|
