Photoacoustic phase-controlled Fourier-transform infrared spectroscopy

TL;DR

This paper introduces a novel combination of phase-controlled Fourier-transform spectroscopy with broadband photoacoustic spectroscopy, achieving a 13-fold increase in measurement speed for sensitive gas detection.

Contribution

It presents the integration of phase-controlled Fourier-transform spectroscopy with CEPAS, enabling faster broadband spectral measurements compared to traditional FTIR methods.

Findings

Achieved a 13-fold speed improvement in broadband CEPAS.

Successfully measured methane absorption spectrum in the mid-infrared region.

Demonstrated the potential for faster, sensitive gas detection using the new technique.

Abstract

We demonstrate a 13-fold speed improvement in broadband cantilever-enhanced photoacoustic spectroscopy (CEPAS) by combining it with phase-controlled Fourier-transform spectroscopy (PC-FTS) instead of traditional Fourier-transform infrared spectroscopy (FTIR). PC-FTS is a modification of FTIR and capable of fundamentally faster interferogram acquisitions. The speed-improvement is beneficial for CEPAS, which is an especially sensitive version of the background-free photoacoustic spectroscopy technique. We used the PC-FTS-CEPAS technique to measure the absorption spectrum of methane in the mid-infrared region (3.3$-$3.5 $\mu$m) with an optical frequency comb as the light source.