期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 12, 页码 4020-4027出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3003006
关键词
Natural gas; Measurement by laser beam; Semiconductor lasers; Ring lasers; Laser modes; Modulation; Gas lasers; Optical sensors; Infrared spectra; Gas leak detection
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA17040501]
- Instrument Developing Project of the Chinese Academy of Sciences [YJKYYQ20170035]
- Innovation Program of Academy of OptoElectronics
- Innovation Program of Academy of Opto-Electronics, the Chinese Academy of Science [Y70B15A13Y]
An improved current-modulated CRDS method was proposed and experimentally validated, achieving proper laser wavelength matching and increased measurement rate. The device exhibited low detection limits and high sensitivity, suitable for natural gas leak detection and pipeline inspection.
An improved current-modulated cavity ring-down spectroscopy(CRDS) approach is proposed and the experimental results reported in this article. The step-wise fine current modulation is imposed on the laser driving direct current (DC) component and achieves a proper wavelength matching between the incident laser beam and the resonating ringing cavity, which is then turned off to stop the laser injection. The feedback of this modulation at this matching point is used not only to monitor the status of the whole building-up process, but also to increase the measurement rate. The device exhibits a detection limit of 0.8 ppbv for CH4 in a 60 second averaging period and a detection limit of 10 ppbv for C2H6 in a 16 second averaging period. In the natural gas leak field test based on a vehicle platform, the background methane concentration in the atmosphere was measured to be 1.95 ppmv with a sensitivity of 18.2 ppbv; while the background ethane concentration of 0.0787 ppmv and sensitivity of 31.2 ppbv was recorded. A typical natural gas pipeline inspection process is introduced and performed in the field test in Beijing. A leakage found during the field test has been repaired by the gas company.
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