Photoacoustic phase-controlled Fourier-transform infrared spectroscopy

Author:

Larnimaa SanteriORCID,Roiz Mikhail,Vainio Markku1ORCID

Affiliation:

1. Tampere University

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 µm) with an optical frequency comb as the light source.

Funder

Academy of Finland

Alfred Kordelin Foundation

University of Helsinki

Publisher

Optica Publishing Group

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