Designing a  ppb-level fiber-optic microphone for photoacoustic spectroscopy of trace gases

Md Abu Zobair; Mina Esmaeelpour

doi:10.1117/12.3003153

12 March 2024 Designing a ppb-level fiber-optic microphone for photoacoustic spectroscopy of trace gases

Md Abu Zobair, Mina Esmaeelpour

Proceedings Volume 12835, Optical Fibers and Sensors for Medical Diagnostics, Treatment, and Environmental Applications XXIV; 1283508 (2024) https://doi.org/10.1117/12.3003153
Event: SPIE BiOS, 2024, San Francisco, California, United States

Abstract

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.

Conference Presentation

Citation Download Citation

Md Abu Zobair and Mina Esmaeelpour "Designing a ppb-level fiber-optic microphone for photoacoustic spectroscopy of trace gases", Proc. SPIE 12835, Optical Fibers and Sensors for Medical Diagnostics, Treatment, and Environmental Applications XXIV, 1283508 (12 March 2024); https://doi.org/10.1117/12.3003153

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