Portable laser-induced breakdown spectroscopy analysis device

Abstract

The invention discloses a portable laser-induced breakdown spectroscopy analysis device. The portable laser-induced breakdown spectroscopy analysis device comprises a laser device, a beam splitting unit, a reflection mirror group, an off axis parabolic mirror and a spectrograph; laser rays emitted by the laser device are transmitted to the reflection mirror group in parallel through the beam splitting unit, and are focused on the surface of a sample to be tested after reflected with the reflection mirror group; signal light rays emitted by the sample to be tested are emitted to the beam splitting unit after reflected with the reflection mirror group; the laser rays and the signal light rays are in coaxial in a light path between the beam splitting unit and the sample to be tested, are reflected to the off axis parabolic mirror through the beam slitting unit, and are transmitted to the spectrograph after reflected with the off axis parabolic mirror, and are connected with a control boxfor spectral analysis and display. By adopting the portable laser-induced breakdown spectroscopy analysis device, the defects existing in a transmission-type non-coaxial spectroscopy analysis device are overcome, meanwhile numerical aperture of focused laser rays is increased, focal spot number is reduced, the energy density of the laser rays acting on the surface of an object is increased, an requirement of an instrument on the energy of the laser device is met, so that the portable laser-induced breakdown spectroscopy analysis device has considerably foreseeable industrial and commercial application value.

Description

technical field [0001] The invention relates to the technical field of element spectrum analysis, in particular to a portable laser-induced breakdown spectrum analysis device. Background technique [0002] Laser-induced breakdown spectroscopy is a detection technology based on atomic emission spectroscopy, which relies on high-energy laser pulses to heat the surface of the sample, so that the particles on the surface of the sample obtain enough energy to break away from the surface and then break down to obtain plasma, and detect atomic emission spectroscopy. . Due to its fast detection speed, the ability to analyze gases, liquids, and solids, the ability to perform full-element analysis, and remote detection, etc., laser-induced breakdown spectroscopy can be widely used in many fields such as environmental monitoring, biomedicine, and geological research. . In view of the inconvenience of sampling in archaeology, architecture, cultural relic inspection, art appraisal, etc...

AI Technical Summary

Problems solved by technology

[0005] (1) The range of the atomic emission spectrum is generally 200-800nm. It is difficult to eliminate chromatic aberration by using a transmission element as a wide-spectrum collection element, which makes the spectral collection efficiency of each wavelength inconsistent. At the same time, the wide-spectrum apochromatic element is expensive, which greatly increases the cost;

[0006] (2) The non-coaxial setting of the excitation light path and the collection light path limits the receiving area of ​​the collected spectrum, reduces the utilization rate of the emission spectrum of the laser plasma hemisphere, so that a higher energy laser is required, which increases the cost of the instrument and reduces the safety;

[0007] (3) Most of the existing laser-induced breakdown spectroscopy analyzers are large in size and mostly desktop, which is not suitable for handling operations

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