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We report multipass broadband photoacoustic spectroscopy of trace gases inthe mid-infrared. The measurement principle of the sensor relies onsupercontinuum-based Fourier transform photoacoustic spectroscopy (FT-PAS), inwhich a scanning interferometer modulates the intensity of a mid-infraredsupercontinuum light source and a cantilever microphone is employed forsensitive photoacoustic detection. With a custom-built external Herriott cell,the supercontinuum beam propagates ten times through a miniature andacoustically non-resonant gas cell. The performance of the FT-PAS system isdemonstrated by measuring the fundamental C-H stretch bands of varioushydrocarbons. A noise equivalent detection limit of 11 ppb is obtained formethane (40 s averaging time, 15 $\mu$W/cm$^{-1}$ incident power spectraldensity, 4 cm$^{-1}$ resolution), which is an improvement by a factor of 12compared to the best previous FT-PAS systems. High linearity and good stabilityof the sensor provide reliable identification of individual species from a gasmixture with strong spectral overlap, laying the foundation for sensitive andselective multi-species detection in small sample volumes.

Sensitive multi-species photoacoustic gas detection based on mid-infrared supercontinuum source and miniature multipass cell