Quantitative analysis of a closed photoacoustic cell that uses a high compliance piezoelectric transducer

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2005-01-01T00:00:00Z

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American Institute of Physics

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Article

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0021-8979

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Jane Hodgkinson, Mark Johnson, and John P. Dakin. Quantitative analysis of a closed photoacoustic cell that uses a high compliance piezoelectric transducer. Journal of Applied Physics, 2005, Vol.98, 084908

Abstract

A treatment of the operation of low-frequency closed photoacoustic cells is presented, which considers the compliance of various cell elements. The optimum detector, according to our predictions, has a sensor whose compliance is large compared to that of the fluid enclosed by the cell. A simple photoacoustic cell has been built, incorporating a thin-walled piezoelectric cylinder. It was used to test the theory, and demonstrate photoacoustic detection of an absorber in aqueous 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 ­W

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