研究目的
Investigating the online monitoring of SF6 decomposition gases (H2S, CO, HF, and SO2) using laser cavity ring-down spectroscopy and fiber-based measurement to provide technical guidance for SF6 gas insulated and high-voltage combined electrical apparatus.
研究成果
The paper successfully realizes online monitoring of SF6 decomposition gas by laser cavity ring-down spectroscopy. The designed system meets the testing requirements of high pressure in SF6 gas insulated electrical equipment and circulating gas detection, with a detection accuracy of 0.4 x 10-6, fulfilling the power system's demand for detection accuracy.
研究不足
The photoacoustic spectroscopy technology requires temperature control or compensation due to different photoacoustic resonances caused by temperature. The influence of humidity of SF6 gas on calibration results must also be considered. The inversion method of concentration calibration needs further study and improvement.
1：Experimental Design and Method Selection:
The study employs laser absorption spectroscopy for online monitoring of SF6 decomposition gases. It focuses on calibration technology, algorithm development, and the design of the optical path and detection circuit.
2：Sample Selection and Data Sources:
The study analyzes the characteristic spectra of SF6 decomposition gases using the HITRAN database at room temperature.
3：List of Experimental Equipment and Materials:
The system uses three DFB semiconductor lasers for detecting H2S, CO, and HF gas characteristic absorption peaks, an optical switch, a beam closure device, an acoustooptic modulator, and a high reflectivity cavity.
4：Experimental Procedures and Operational Workflow:
The system modulates laser light with a signal generator, combines multi-wavelength light into an acoustooptic modulator, and directs it into a high reflectivity cavity for detection.
5：Data Analysis Methods:
The concentration of gases is proportional to photoacoustic signal, and concentration inversion is realized by a one-dimensional linear equation. The system's detection accuracy and stability are tested.
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