High sensitivity and ultra-low concentration range photoacoustic spectroscopy based on trapezoid compound ellipsoid resonant photoacoustic cell and partial least square

• Published in: Photoacoustics (Munich) 2024-02, Vol.35, p.100583-100583, Article 100583
• Main Authors: Wang, Qiaoyun, Xu, Shunyuan, Zhu, Ziheng, Wang, Jilong, Zou, Xin, Zhang, Chu, Liu, Qiang
• Format: Article
• Language: English
• Subjects: C2H2 gas; Partial least square; Photoacoustic spectroscopy; Trace gas detection; Trapezoid compound ellipsoidal photoacoustic cell
• ISSN: 2213-5979; 2213-5979
• DOI: 10.1016/j.pacs.2023.100583

A high sensitivity and ultra-low concentration range photoacoustic spectroscopy (PAS) gas detection system, which was based on a novel trapezoid compound ellipsoid resonant photoacoustic cell (TCER-PAC) and partial least square (PLS), was proposed to detect acetylene (C H ) gas. In the concentration range of 0.5 ppm ∼ 10.0 ppm, the limit of detection (LOD) values of TCER-PAC-based PAS system without data processing was 66.4 ppb, which was lower than that of the traditional trapezoid compound cylindrical resonant photoacoustic cell (TCCR-PAC). The experimental results indicated that the TCER-PAC had higher sensitivity than of TCCR-PAC. Within the concentration range of 12.5 ppb ∼ 125.0 ppb, the LOD and limit of quantification (LOQ) of TCER-PAC-based PAS system combined with PLS regression algorithm were 1.1 ppb and 3.7 ppb, respectively. The results showed that higher detection sensitivity and lower LOD were obtained by PAS system with TCER-PAC and PLS than that of TCCR-PAC-based PAS system.