研究目的
Investigating the use of vacuum ultraviolet laser induced breakdown spectroscopy (VUV LIBS) for detecting sulphur in thermally aged transformer insulation material.
研究成果
VUV LIBS was found to be suitable for analyzing sulphur contaminant in aged OIP insulation material. The use of ambient He gas confined the LIBS plasma and increased the intensity of S emission lines. The intensities of S contaminant emission lines increased with the duration of ageing of OIP material, indicating a linear relationship between measured concentration of S contaminant and VUV LIBS intensity ratio.
研究不足
The intensity of sulphur emission lines was low in vacuum ambient, requiring the use of He gas for confinement to improve signal intensity. The technique requires optimization of parameters such as fore-slit position, laser power, and defocusing for effective detection.
1：Experimental Design and Method Selection:
VUV LIBS was used for contaminant analysis in thermally aged oil impregnated pressboard (OIP) insulation material. The methodology included spatially resolved and temporally integrated detection of emission lines.
2：Sample Selection and Data Sources:
Accelerated thermal ageing of insulating oil impregnated pressboard (OIP) material was carried out in simulated transformer conditions. Samples were removed at 200, 500, 600, and 900 hour intervals during the ageing process.
3：List of Experimental Equipment and Materials:
A nanosecond, Q switched, Nd:YAG laser (Continuum Surelite, model III-10), a VUV spectrometer (VM-521, Action Research Corporation), and a CCD camera (Andor Technology, DV420-BN) were used.
4：Experimental Procedures and Operational Workflow:
The laser was focused onto the aged OIP surface using a lens. The plasma emission was guided through a fore-slit to the VUV spectrometer. Spectra were recorded on a CCD camera.
5：Data Analysis Methods:
The intensity of S IV and S V emission lines was analyzed and compared to the C II line intensity for quantitative analysis.
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