Open AccessQuantitative analysis of a closed photoacoustic cell that uses a high compliance piezoelectric transducer
Author(s) -
J. Hodgkinson,
Mark Johnson,
J.P. Dakin
Publication year - 2005
Publication title -
journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.699
H-Index - 319
eISSN - 1089-7550
pISSN - 0021-8979
DOI - 10.1063/1.2108147
Subject(s) - transducer , photoacoustic effect , piezoelectricity , materials science , photoacoustic imaging in biomedicine , signal (programming language) , photoacoustic spectroscopy , absorption (acoustics) , detector , diode , optics , laser , power (physics) , cylinder , optoelectronics , acoustics , physics , computer science , composite material , mechanical engineering , quantum mechanics , programming language , engineering
A treatment of the operation of low-frequency closed photoacoustic cells ispresented, which considers the compliance of various cell elements. The optimumdetector, according to our predictions, has a sensor whose compliance is largecompared to that of the fluid enclosed by the cell. A simple photoacoustic cellhas been built, incorporating a thin-walled piezoelectric cylinder. It was usedto test the theory, and demonstrate photoacoustic detection of an absorber inaqueous solution, excited by a low power 678nm laser diode modulated at 110Hz.We have detected absorbances as low as approximately 3ï ´10 -3 cm -1 (SNR=1),corresponding to the absorption of light with a modulated power of 50ï Â
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