• 光谱学 •

### 基于量子级联激光的大区域SF6泄露实时检测

1. 1. 深圳供电局有限公司, 广东 深圳 518000;
2. 河南省日立信股份有限公司, 郑州 450001
• 收稿日期:2019-06-10 出版日期:2019-10-25 发布日期:2019-07-09
• 通讯作者: 曾晓哲(1986-),男,工程师,硕士,主要研究方向为仪器仪表传感器及高压绝缘气体化学.Email:zengxiaozhe9@126.com E-mail:zengxiaozhe9@126.com
• 作者简介:唐峰(1969-),男,高级工程师,博士,主要研究方向为电网技术监督.Email:tangfeng@sz.csg.cn
• 基金资助:

中国南方电网重大科技项目（No.090000KK52170140）

### Real-time Detection of SF6 Leakage in Large Area Based on Quantum Cascade Laser

TANG Feng1, LIU Shun-gui1, Lü Qi-shen1, LI Xin-tian2, HE Shu-kai2, ZENG Xiao-zhe2, XU Ge2, YUE Yun-qi2

1. 1. Shenzhen Power Supply Co., Ltd., Shenzhen, Guangdong 518000, China;
2. Henan Relations Co., Ltd., Zhengzhou 450001, China
• Received:2019-06-10 Online:2019-10-25 Published:2019-07-09
• Contact: 2019-07-09 E-mail:zengxiaozhe9@126.com
• Supported by:

China Southern Power Grid Major Science and Technology Project (No. 090000KK52170140)

Abstract:

A tunable diode laser absorption spectroscopy technique using quantum cascade lasers and a movable open optical path system are proposed to realize on-line detection of SF6 gas in the leakage region. The optical path system is located around the interval of high-voltage combined appliances, and through the non-contact combination with the sensing system. The emission frequency range of the mid-infrared laser with injection current of 680 mA can cover the selected wavelength of SF6 gas at work temperature of 10℃. The precise background absorption of the second harmonic absorption is obtained by extracting and separating the internal environment of the large area laboratory module for several times. The leaked SF6 gas after diffusion equilibrium is measured by using the tunable laser sensor system with 10.55 μm. After subtracting the background absorption, the second harmonic absorption spectrum of the leaked SF6 gas was obtained. Research results show that under the open light path of 14.3 m, gas chromatography-thermal conductivity detector traceability of calibration data with tunable diode laser absorption spectroscopy technology testing consistency is well, the maximum deviation is 2.26%. The second harmonic signal amplitude and largest measuring concentration have a high fitting degree with fitting coefficient of 0.998, and SF6 volume concentration of the detection limit is 1.8×10-6. The study can provide a new detection method for SF6 gas leakage, so as to realize real-time online monitoring of SF6 gas under large area environment of high voltage combined appliances.