Open AccessNear-infrared laser photoacoustic gas sensor for simultaneous detection of CO and H2S
Author(s) -
Xukun Yin,
Miao Gao,
Ruiqi Miao,
Le Zhang,
Xueshi Zhang,
Lixian Liu,
Xiaopeng Shao,
Frank K. Tittel
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.441698
Subject(s) - optics , photoacoustic spectroscopy , materials science , laser , infrared , amplifier , tunable diode laser absorption spectroscopy , diode , tunable laser , optoelectronics , physics , cmos
A ppb-level H 2 S and CO photoacoustic spectroscopy (PAS) gas sensor was developed by using a two-stage commercial optical fiber amplifier with a full output power of 10 W. Two near-infrared diode lasers with the central wavenumbers of 6320.6 cm -1 and 6377.4 cm -1 were employed as the excitation laser source. A time-division multiplexing method was used to simultaneously detect CO and H 2 S with an optical switch. A dual-resonator structural photoacoustic cell (PAC) was theoretically simulated and designed with a finite element analysis. A µV level background noise was achieved with the differential and symmetrical PAC. The performance of the multi-component sensor was evaluated after the optimization of frequency, pressure and modulation depth. The minimum detection limits of 31.7 ppb and 342.7 ppb were obtained for H 2 S and CO at atmospheric pressure.