| Abstrakt: |
In order to clarify the spectral characteristics of rare earth alloy materials detected by laser-induced breakdown spectroscopy (LIBS) technology, a rapid detection method based on LIBS is further developed to promote its application in the field of rare earth. In this paper, the excitation spectrum of GdFe alloy material with laser induced breakdown spectrometer, combined with signal intensity and background noise, was studied and the optimum parameters were determined. The influence of the parameters of laser and spectrometer on the spectrum was investigated, and the LIBS detection method of GdFe alloy was discussed according to the trend of the relevant spectral lines in the excitation spectrum. It was found that the distance(Z value) between GdFe alloy sample and laser aperture, laser energy and integration time were the key parameters affecting the signal intensity and background noise of LIBS spectrum. Because the surface of metal and alloy samples was often covered with oxide layer, the influence of pre-denudation times of pulsed laser on spectral stability was also discussed. It was concluded that under the excitation of double pulses of 164 mj laser energy, the spectral effect was guaranteed by pre-denudation once. The effect of simultaneous excitation and delayed excitation of two lasers on the origin of GdFe alloy spectra was also explored. It was found that the signal intensity of the spectra obtained from the simultaneous excitation of single pulse and double pulse was not the cumulative signal of the two pulses. Through spectral analysis, it was determined that the Z-value was 0.8 mm, the pulse energy of the two lasers was 164 mJ, the integration time was 12 µs, and the pulse delay time was 0 µs. Under these conditions, the spectral effect of GdFe alloy was the best. This study can provide reference for the establishment of LIBS detection methods for GdFe alloy materials, expand the application of LIBS technology in the field of rare earth, and provide basic research data for the development of rapid detection technology for rare earth alloy products. [ABSTRACT FROM AUTHOR] |
