Abstract

A Helmholtz resonator attached to a nonresonant photoacoustic cell enhances the responsivity to trace gas absorption by as much as a factor of 15.3. A simple system model based on a lumped parameter approach predicts the experimentally determined resonance frequency f₀ within 6% for all five resonator volumes tried and gives a pressure amplitude response at resonance proportional to $f_0^{-5/2}$, which is the approximate experimental dependence. Optimization of response based on the model shows a pressure amplitude dependence on a^1/2, the square root of the radius of the cylindrical tube connecting the cell and the resonator.

© 1981 Optical Society of America

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