Yin Xukun, Dong Lei, Wu Hongpeng, Gao Miao, Zhang Le, Zhang Xueshi, Liu Lixian, Shao Xiaopeng, Tittel Frank K
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.
Photoacoustics. 2021 Dec 4;25:100319. doi: 10.1016/j.pacs.2021.100319. eCollection 2022 Mar.
In SF insulated high-voltage gas power systems, HO 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 HO detection in SF buffer gas was developed by use of a near-infrared commercial DFB diode laser. Since the specific physical constants of SF are strongly different from that of N or air, the resonant frequency and -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.
在SF绝缘高压气体电力系统中，HO是最具问题的杂质，它不仅会降低绝缘性能，还会产生促进腐蚀的酸性气氛。腐蚀会损坏电气设备并导致泄漏，对人员和环境构成严重安全隐患。利用近红外商用分布反馈（DFB）二极管激光器开发了一种基于石英增强光声光谱（QEPAS）的传感器系统，用于检测SF缓冲气体中低于百万分之一水平的HO。由于SF的特定物理常数与N或空气的物理常数有很大差异，裸石英音叉（QTF）的共振频率和品质因数分别变为32763Hz和4173。最佳垂直检测位置距离QTF开口1.2mm。在对声学微谐振器（AmR）参数、气压和调制深度进行实验优化后，平均时间为1s时检测限达到0.49ppm，这为电力系统的安全监测提供了有力的预防工具。
