Microwave-assisted laser-induced breakdown spectrum device

Abstract

The invention discloses a microwave-assisted laser-induced breakdown spectrum device which comprises a laser device, a microwave generator, a pulse delay generator, a collimation system, a spectrograph and an optical focusing system, wherein the laser device is firstly triggered by the pulse delay generator to emit a pulse type laser beam; the laser beam is collimated by the collimation system, and then the energy of the laser beam is focused on the surface of a sample through the optical focusing system; the laser beam and the sample interact with each other so as to generate high-temperature high-density plasma; and then the microwave generator is triggered by the pulse delay generator to emit a microwave pulse and the microwave pulse is controlled to stimulate the plasma again; under the effect of electromagnetic field, the electrons in the plasma are accelerated, so that sufficient kinetic energy is acquired for stimulating atoms and ions again; the electrons under the atom and ion stimulating state transit to lower energy level; during transition, a spectral signal is emitted, namely, a characteristic spectrum with specific wavelength is emitted; the spectrograph is triggered by the pulse delay generator again to collect the spectral signal.

Description

technical field [0001] The invention relates to a laser-induced breakdown spectroscopy device, in particular to a microwave-assisted laser-induced breakdown spectroscopy device. Background technique [0002] Laser-induced breakdown spectroscopy, as a new emission spectroscopy analysis technique, has attracted more and more attention since it was proposed in 1962. The process of laser-induced plasma can be described as: a beam of pulsed laser focuses the laser energy on the sample through the focusing system, the sample is ablated by laser, vaporized and decomposed, and the atoms, molecules and their particles are ionized by the multi-photon effect, resulting in The first free electrons. The electrons further increase their own energy by absorbing the energy of photons. At the same time, because the laser energy is strong enough and the pulse time is long enough, the free electrons are accelerated under the action of the laser, so that the electrons have enough energy to bom...

AI Technical Summary

Problems solved by technology

However, LIBS technology also has its own defects: the influence of high detection limit, poor repeatability and matrix effect on the measurement of trace elements

However, DP-LIBS and LIBS-LIF can increase the signal strength and sensitivity to a certain extent, but due to the need for additional lasers and transmission optical paths, the system is more complicated and the cost of the entire system increases, which limits the promotion and application of LIBS technology

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