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 (C₂H₂) 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.

提出了一种基于新型梯形复合椭球谐振光声池（TCER-PAC）和偏最小二乘法（PLS）的高灵敏度、超低浓度范围光声光谱（PAS）气体检测系统，用于检测乙炔（C ₂ H ₂ )气体。在0.5 ppm ∼ 10.0 ppm浓度范围内，基于TCER-PAC的PAS系统未经数据处理的检测限（LOD）值为66.4 ppb，低于传统梯形复合圆柱谐振光声池（TCCR）的检测限（LOD）值为66.4 ppb。 -PAC）。实验结果表明TCER-PAC比TCCR-PAC具有更高的灵敏度。在12.5 ppb ∼ 125.0 ppb的浓度范围内，基于TCER-PAC的PAS系统结合PLS回归算法的LOD和定量限（LOQ）分别为1.1 ppb和3.7 ppb。结果表明，采用TCER-PAC和PLS的PAS系统比基于TCCR-PAC的PAS系统获得了更高的检测灵敏度和更低的LOD。