Abstract

A new methodology for the development of miniature photoacoustic trace gas sensors using 3D printing is presented. A near-infrared distributed feedback (DFB) laser is used together with a polymer-based gas cell, off-the-shelf fiber optic collimators, and a microelectromechanical system (MEMS) microphone to measure acetylene at 1532.83 nm. The resonance behavior of the miniature gas cell is analyzed using a theoretical and experimental approach, with a measured resonance frequency of 15.25 kHz and a $Q$-factor of 15. A minimum normalized noise equivalent absorption of $4.5\times {10}^{-9}\mathrm{W}{\mathrm{cm}}^{-1}{\mathrm{Hz}}^{-1/2}$ is shown together with a $3\sigma$ detection limit of 750 parts per billion (ppb) for signal averaging times of 35 s. The fiber-coupled delivery and miniature cost-effective cell design allows for use in multipoint and remote detection applications.

© 2014 Optical Society of America

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