Method for recognizing slag variety by combining with laser-induced breakdown spectroscopy based on least squares support vector machine
A laser-induced breakdown and support vector machine technology, applied in the field of spectral analysis, can solve problems such as time-consuming, limited real-time rapid analysis, and inability to quickly obtain steel product quality information, so as to overcome interference, improve prediction accuracy, and tolerate degree of effect
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[0020] The LIBS system used in this example includes a dual-wavelength Q-switched single-pulse Nd:YAG laser, an optical system, an adjustable three-dimensional sample stage, an echelle spectrometer (ARYELLE-UV-VIS, LTB400, German) and a computer. The laser energy is 80mJ, the fundamental frequency light wavelength is 1064 nm, the pulse width is 10 ns, the delay time is 1.5 μs, the repetition frequency is 5 Hz, and the spectral range is 220nm-800nm.
[0021] Three kinds of slags (blast furnace slag, converter slag, and flat furnace slag) were selected, and a total of 30 slag samples were used. For the convenience of testing, each slag sample was ground to 200 mesh with a ball mill, and then each sample was pressed into a thin sheet about 2mm thick, with a pressure of 400MPa and last for 5min.
[0022] The LIBS signals of different slag samples were collected by laser-induced breakdown spectroscopy. Randomly select 50 measurement points for each slag sample, obtain a measuremen...
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