Study on the accuracy of photoacoustic spectroscopy system based on multiple linear regression correction algorithm

Photoacoustic spectroscopy technology is an important method to detect the concentration of trace gases, so it great significance improve detection accuracy photoacoustic system (PAS). In this paper, a multiple linear regression algorithm was proposed correct PAS based on high-precision cavity ring-down measurement system. The results showed that correlation coefficient R2 between corrected values model and reference true 0.903. It can be seen effectively PAS. A comparative experiment carried out with long optical path differential absorption (LP-DOAS) for measuring NO2 in ambient atmosphere. experimental LP-DOAS had good concentration, slope fitting 1.012 ± 0.040, 0.948.