We report our progress on the design of a highly sensitive photoacoustic spectroscopy sensor using an extrinsic Fabry- Perot interferometer fiber-optic microphone for detecting parts-per-billion-level trace gas concentrations. A theoretical model is set up to predict the mechanical behavior of the sensor and extended with a mathematical framework for detecting gas concentration from the generated acoustic modes in a photoacoustic gas cell. A detection limit up to 1.55ppb for Nitric oxide is predicted based on the model for a minimum detectable pressure of 2.1μpa√Hz. We also investigated different frequency response of two different gas cells with the finite element method (FEM) using COMSOL for the fiber-optic acoustic sensor.
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