Abstract

A multipoint gas sensing scheme based on photoacoustic spectroscopy was proposed. Multiple photoacoustic spectroscopy (PAS) gas cells (resonant frequency $f_0=5.0\mathrm{kHz}$) were connected in series for the multipoint gas sensing with wavelength modulation technique. The PAS signal was excited by modulating the tunable distributed feedback laser diode wavelength at $f_0/2$ using a changing driving current. The gas concentration of each gas cell was obtained by the PAS signal, which was demodulated by the lock-in amplifier. A multipoint PAS experiment to detect the water vapor at 1368.597 nm was implemented to verify the scheme we presented. With the three PAS gas cells, the linear response to the water vapor concentration of our sensors achieved 0.9978, 0.99591, and 0.99617, and their minimum detection limits were 479, 662, and 630 ppb, respectively.

© 2018 Optical Society of America

Two-component gas quartz-enhanced photoacoustic spectroscopy sensor based on time-division multiplexing of distributed-feedback laser driver current

Zongliang Wang, Jun Chang, Cunwei Tian, Yiwen Feng, Cheng Wang, Hao Zhang, Qinduan Zhang, Hefu Li, Zhenbao Feng, Xiukun Zhang, and Longfei Tang
Appl. Opt. 58(31) 8479-8485 (2019)

Multicomponent gas detection technology of FDM and TDM based on photoacoustic spectroscopy

Yuanfang Yu, Cunwei Tian, Zongliang Wang, Siyu Qian, Cunying Yan, and Hao Zhang
Appl. Opt. 60(4) 838-843 (2021)

Off-resonant photoacoustic spectroscopy for analysis of multicomponent gas mixtures at high concentrations using broadband vibrational overtones of individual gas species

Ramya Selvaraj, Nilesh J. Vasa, and S. M. Shiva Nagendra
Appl. Opt. 58(15) 4118-4126 (2019)

Simultaneous detection of greenhouse gases CH₄ and CO₂ based on a dual differential photoacoustic spectroscopy system

Fupeng Wang, Jinghua Wu, Yaopeng Cheng, Liyan Fu, Jianguo Zhang, and Qiang Wang
Opt. Express 31(21) 33898-33913 (2023)

Multi-MEMS-microphone schemes in a miniature photoacoustic cell for acetylene trace gas measurement

Qing He, Weirun Zhu, Haifei Lv, Xiaoyan Wen, Zhexuan Zheng, Jiafu Wang, and Min Li
Appl. Opt. 62(6) 1647-1653 (2023)