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Article

Near-Infrared Quartz-Enhanced Photoacoustic Sensor for H2S Detection in Biogas

1
College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
2
PolySense Lab, Physics Department, Politecnico di Bari, I-70100 Bari, Italy
3
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
4
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(24), 5347; https://doi.org/10.3390/app9245347
Received: 10 November 2019 / Revised: 29 November 2019 / Accepted: 4 December 2019 / Published: 6 December 2019
(This article belongs to the Special Issue Quartz-Enhanced Photoacoustic and Photothermal Spectroscopy)
A quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor for H2S detection operating in near-infrared spectral range is reported. The optical source is an erbium-doped fiber amplified laser with watt-level optical power. The QEPAS spectrophone is composed of a quartz tuning fork with a resonance frequency of 7.2 kHz, a quality factor of 8500, and a distance between prongs of 800 µm, and two tubes with a radius of 1.3 mm and a length of 23 mm acting as an organ pipe resonator. With this spectrophone geometry, the photothermal noise contribution of the spectrophone was removed and the theoretical thermal noise level was achieved. The position of both tubes with respect to custom quartz tuning fork has been investigated as a function of signal amplitude, Q-factor, and noise of the QEPAS sensor when a high-power laser was used. Benefit from the linearity of the QEPAS signal to the excitation laser power, a detection sensitivity of 330 ppb for H2S detection was achieved at atmospheric pressure and room temperature, when the laser power was 1.6 W and the signal integration time was set to 300 ms, corresponding to a normalized noise equivalent absorption of 3.15 × 10−9 W cm−1/(Hz)1/2. The QEPAS sensor was then validated by measuring H2S in a biogas sample. View Full-Text
Keywords: quartz tuning fork; hydrogen sulfide; photoacoustic spectroscopy; high power exciting laser quartz tuning fork; hydrogen sulfide; photoacoustic spectroscopy; high power exciting laser
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MDPI and ACS Style

Zhao, F.; Gao, Y.; Yang, L.; Yan, Y.; Li, J.; Ren, J.; dello Russo, S.; Zifarelli, A.; Patimisco, P.; Wu, H.; Dong, L. Near-Infrared Quartz-Enhanced Photoacoustic Sensor for H2S Detection in Biogas. Appl. Sci. 2019, 9, 5347. https://doi.org/10.3390/app9245347

AMA Style

Zhao F, Gao Y, Yang L, Yan Y, Li J, Ren J, dello Russo S, Zifarelli A, Patimisco P, Wu H, Dong L. Near-Infrared Quartz-Enhanced Photoacoustic Sensor for H2S Detection in Biogas. Applied Sciences. 2019; 9(24):5347. https://doi.org/10.3390/app9245347

Chicago/Turabian Style

Zhao, Fagang, Yutong Gao, Lin Yang, Yuqing Yan, Jiashi Li, Jingrong Ren, Stefano dello Russo, Andrea Zifarelli, Pietro Patimisco, Hongpeng Wu, and Lei Dong. 2019. "Near-Infrared Quartz-Enhanced Photoacoustic Sensor for H2S Detection in Biogas" Applied Sciences 9, no. 24: 5347. https://doi.org/10.3390/app9245347

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