 | Helmholtz resonator |
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 | Fabrication of a resonant photoacoustic cell for samples study
Author : Kapil, J. C.;Joshi, S. K.;Rai, A. K.
Source : Defence Science Journal ; Vol:54(2) ; 2004 ; pp 209-218
Subject : 681.2 Instrumentation
Keywords : Photoacoustic spectroscopy;Thermal diffusivity;Low temperature photoacoustic cell;Resonant photoacoustic cell;Helmholtz resonator;Photoacoustic signal;Acoustic cell;Nondestructive testing ;Plexi-glass
Abstract : Nondestructive treatment of a sample in photoacoustic spectroscopy is helpful in the study of thermal and optical properties of ice and snow. In the present study, a low-temperature resonant photoacoustic cell based on Helmholtz resonator model, has been designed and fabricated for the study of samples like ice or snow. Its performance has also been studied using carbon black as a standard sample and various other samples like water, ice, glass, plexi-glass, polycarbonate, etc. Thermal diffusivity of ice, water, and many other transparent materials has been determined by varying chopping frequency and recording corresponding phase changes in the photoacoustics signal. The results obtained are in good agreement with those predicated by osencwaig-Gersho(R-G)/ (supercript)1 theory. |
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