Multigas nonresonant photoacoustic spectroscopy sensor based on a broadband radiation source

Abstract Multigas detection is in demand for a wide range of environmental and industrial applications. In this work, a sensitive and selective multigas photoacoustic spectroscopy (MG‐PAS) sensor was developed by employing a nonresonant photoacoustic spectroscopy technique combining a broadband radiation source. Six gases including CO, CO 2 , CH 4 , C 2 H 2 , C 2 H 4 , and C 2 H 6 were selected as target measurement molecules. Selectivity of the MG‐PAS was realized by using six mid‐infrared narrow‐band filters which integrated in a homemade filter wheel. A minimum concentration detection limits of 0.2 ppm for CO, 0.05 ppm for CO 2 , 0.12 ppm for CH 4 , 0.1 ppm for C 2 H 2 , 0.81 ppm for C 2 H 4 , and 0.05 ppm for C 2 H 6 were obtained, respectively, with a 1‐s integration time. Measurements of six gas mixtures showed that the average measurement error of the MG‐PAS sensor was within 2%.