Near-infrared sensitive differential Helmholtz-based hydrogen sulfide photoacoustic sensors

• DOI: 10.1364/oe.488835
• Publication Date: 2023-04-03T16:01:04Z
• Authors: Qiuyang Ma; Lei Li; Zijian Gao; Shen Tian; Jiaxin Yu; Xuechao Du; Yingying Qiao; Chongxin Shan
• Keywords: Photoacoustic Spectroscopy; Photoacoustic effect

A near-infrared (NIR) sub-ppm level photoacoustic sensor for hydrogen sulfide (H2S) using a differential Helmholtz resonator (DHR) as the cell (PAC) was presented. The core detection system composed of NIR diode laser with center wavelength 1578.13 nm, an Erbium-doped optical fiber amplifier (EDFA) output power ∼120 mW, and DHR. Finite element simulation software used to analyze influence DHR parameters on resonant frequency acoustic pressure distribution system. Through comparison, volume 1/16 that conventional H-type PAC similar frequency. performance evaluated after optimizing structure modulation experimental results showed had excellent linear response gas concentration minimum limit (MDL) H2S in mode can reach 460.8 ppb.