Compact QEPAS humidity sensor in SF6 buffer gas for high-voltage gas power systems

Xukun Yin; Lei Dong; Hongpeng Wu; Miao Gao; Le Zhang; Xueshi Zhang; Lixian Liu; Xiaopeng Shao; Frank K. Tittel

Photoacoustics (Mar 2022)

Compact QEPAS humidity sensor in SF6 buffer gas for high-voltage gas power systems

Xukun Yin,
Lei Dong,
Hongpeng Wu,
Miao Gao,
Le Zhang,
Xueshi Zhang,
Lixian Liu,
Xiaopeng Shao,
Frank K. Tittel

Affiliations

Xukun Yin: School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China; Xi’an Key Laboratory of Computational Imaging, Xidian University, Xi’an 710071, China
Lei Dong: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China; Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China; Corresponding author at: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China.
Hongpeng Wu: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China; Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
Miao Gao: School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China; Xi’an Key Laboratory of Computational Imaging, Xidian University, Xi’an 710071, China
Le Zhang: School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China; Xi’an Key Laboratory of Computational Imaging, Xidian University, Xi’an 710071, China
Xueshi Zhang: School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China; Xi’an Key Laboratory of Computational Imaging, Xidian University, Xi’an 710071, China
Lixian Liu: School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China; Xi’an Key Laboratory of Computational Imaging, Xidian University, Xi’an 710071, China
Xiaopeng Shao: School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China; Xi’an Key Laboratory of Computational Imaging, Xidian University, Xi’an 710071, China; Corresponding author at: School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China.
Frank K. Tittel: Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA

Journal volume & issue: Vol. 25
p. 100319

Abstract

Read online

In SF6 insulated high-voltage gas power systems, H2O is the most problematic impurity which not only decreases insulation performance but also creates an acidic atmosphere that promotes corrosion. Corrosion damages electrical equipment and leads to leaks, which pose serious safety hazards to people and the environment. A QEPAS-based sensor system for the sub-ppm level H2O detection in SF6 buffer gas was developed by use of a near-infrared commercial DFB diode laser. Since the specific physical constants of SF6 are strongly different from that of N2 or air, the resonant frequency and Q-factor of the bare quartz tuning fork (QTF) had changed to 32,763 Hz and 4173, respectively. The optimal vertical detection position was 1.2 mm far from the QTF opening. After the experimental optimization of acoustic micro-resonator (AmR) parameters, gas pressures, and modulation depths, a detection limit of 0.49 ppm was achieved for an averaging time of 1 s, which provided a powerful prevention tool for the safety monitoring in power systems.

Published in Photoacoustics

ISSN: 2213-5979 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics: Acoustics. Sound; Science: Physics: Optics. Light
Website: http://www.journals.elsevier.com/photoacoustics/

About the journal

Abstract

Keywords