All-optical non-resonant photoacoustic spectroscopy for multicomponent gas detection based on aseismic photoacoustic cell

Lujun Fu; Ping Lu; Yufeng Pan; Yi Zhong; Chaotan Sima; Qiang Wu; Jiangshan Zhang; Lingzhi Cui; Deming Liu

doi:10.1016/j.pacs.2023.100571

All-optical non-resonant photoacoustic spectroscopy for multicomponent gas detection based on aseismic photoacoustic cell

Photoacoustics. 2023 Nov 9:34:100571. doi: 10.1016/j.pacs.2023.100571. eCollection 2023 Dec.

Authors

Lujun Fu^{1

2}, Ping Lu^{1

2

3}, Yufeng Pan¹, Yi Zhong¹, Chaotan Sima^{1

2

3}, Qiang Wu⁴, Jiangshan Zhang⁵, Lingzhi Cui⁶, Deming Liu^{1

2}

Affiliations

¹ Wuhan National Laboratory for Optoelectronics (WNLO) and National Engineering Research Center for Next Generation Internet Access System, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
² Shenzhen Huazhong University of Science and Technology Research Institute, Shenzhen 518000, China.
³ Wuhan OV Optical Networking Technology Co., Ltd., Wuhan 430073, China.
⁴ Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne NE1 8ST, United Kingdom.
⁵ Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
⁶ State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.

Abstract

An all-optical non-resonant photoacoustic spectroscopy system for multicomponent gas detection based on a silicon cantilever optical microphone (SCOM) and an aseismic photoacoustic cell is proposed and demonstrated. The SCOM has a high sensitivity of over 96.25 rad/Pa with sensitivity fluctuation less than ± 1.56 dB between 5 Hz and 250 Hz. Besides, the minimal detectable pressure (MDP) of the sensor is 0.55 μPa·Hz^-1/2 at 200 Hz, which indicates that the fabricated sensor has high sensitivity and low noise level. Six different gases of CO₂, CO, CH₄, C₂H₆, C₂H₄, C₂H₂ are detected at the frequency of 10 Hz, whose detection limits (3σ) are 62.66 ppb, 929.11 ppb, 1494.97 ppb, 212.94 ppb, 1153.36 ppb and 417.61 ppb, respectively. The system achieves high sensitivity and low detection limits for trace gas detection. In addition, the system exhibits seismic performance with suppressing vibration noise by 4.5 times, and achieves long-term stable operation. The proposed non-resonant all-optical PAS multi-component gas detection system exhibits the advantages of anti-vibration performance, low gas consumption and long term stability, which provides a solution for working in complex environments with inherently safe.

Keywords: Aseismic photoacoustic cell; Multicomponent gas detection; Optical microphone; Photoacoustic spectroscopy; Silicon cantilever.