Photoacoustic phase-controlled Fourier-transform infrared spectroscopy

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