Title: Photoacoustic phase-controlled Fourier-transform infrared spectroscopy Show Chinese title

Title: 光声相位控制傅里叶变换红外光谱学

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. Show Chinese abstract

Abstract: 我们通过将宽带悬臂增强光声光谱（CEPAS）与相位控制傅里叶变换光谱（PC-FTS）结合，而不是传统的傅里叶变换红外光谱（FTIR），实现了13倍的速度提升。PC-FTS是对FTIR的改进，能够实现根本性更快的干涉图采集。速度提升对CEPAS有益，CEPAS是一种特别灵敏的无背景光声光谱技术。我们使用PC-FTS-CEPAS技术在中红外区域（3.3$-$3.5 $\mu$m）测量了甲烷的吸收光谱，以光学频率梳作为光源。