Laser-induced breakdown spectroscopy detection method and device in laser ablation-assisted resonance way

Abstract

The invention discloses a laser-induced breakdown spectroscopy detection method and device in a laser ablation-assisted resonance way. The method is characterized in that a to-be-detected solid sampleis ablated by a fiber laser with fixed wavelength, and is melted, spattered and evaporated, so as to produce continuous aerosol; the aerosol is transferred into a new space location, and then is subject to plasma excitation by laser with adjustable wavelength, namely the aerosol is radiated by the front edge of the pulse to produce low-density steam, the back edge of the pulse and steam feature are subjected to resonance ionizing to produce plasma, and the influence by the matrix effect is eliminated; the wavelength is adjusted to be consistent with the resonance excitation wavelength corresponding to the characteristic spectral line of the analyzed element, and the characteristic spectral line of a target element is enhanced; the transmitting light of the plasma is collected and analyzed, so as to obtain the content of the to-be-analyzed element. The method has the advantages that the uniformity of the analysis matrix is realized, the signal-to-noise ratio is effectively increased, and the influence to the quantitative analysis property of the laser-induced breakdown spectroscopy by the matrix effect and the spectrum interference is decreased.

Description

technical field [0001] The invention belongs to the technical field of atomic emission spectrum detection, and in particular relates to a laser ablation-assisted resonant laser-induced breakdown spectrum detection method and device. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS for short) technology is a laser plasma spectral analysis technology. LIBS technology sample processing is simple, detection speed is fast, suitable for field, real-time online and remote detection. However, the conventional LIBS technology using a single laser as an excitation source is difficult to overcome the problems of matrix effect and spectral interference. The difference in the physical or chemical form of the elements in the material has a direct impact on the interaction between the laser and the material, the intensity of the plasma emitted light, the sensitivity of element analysis and the accuracy of quantitative analysis, which is the so-called matrix effect,...

AI Technical Summary

Problems solved by technology

However, the device still has the following problems: (1) It is only suitable for the analysis of liquid samples and cannot realize the analysis of solid samples; (2) Although the use of LIBS-LIF can greatly improve the spectral line intensity and analytical sensitivity, it does not aim at affecting the quantitative analysis of LIBS. Severe matrix effects and spectral interference problems proposed solutions

This invention can reduce the cost and volume of LIBS instruments, but it is difficult to control the acquisition delay by directly using high-repetition fiber laser as the plasma excitation source, and the strong spectral continuous background leads to low detection sensitivity, and it also cannot solve the problem of matrix effect and spectral interference problem

Images