High-performance portable LIBS analysis system

Abstract

The invention discloses a high-performance portable LIBS (laser-induced breakdown spectroscopy) analysis system which comprises a shell, a high-energy laser, a spectrograph, an optical machine part, a battery pack, a microcomputer, a probe and an external power supply interface, wherein the high-energy laser, the spectrograph, the optical machine part, the battery pack and the microcomputer are arranged in the shell, and the probe and the external power supply interface are arranged outside the shell. The high-energy laser and the spectrograph are both connected with the microcomputer. The optical machine part comprises a light beam shaping unit, a laser reflector, a dichroscope, a converging lens and an optical fiber coupler; the probe comprises an aspherical lens and a nozzle, and a cylindrical space constraint cavity is formed in the middle of the nozzle; and the battery pack and / or the external power supply interface supply power to the whole device. A high-energy pulse laser is used as an excitation source, so that a metal (alloy) sample can be excited, and a nonmetal (rock, soil and the like) sample can be excited to generate plasma; by adopting the high-energy pulse laser and the beam shaping unit, the design of a coaxial light path and the probe is optimized, and the signal stability and the analysis capability of the LIBS spectrum are effectively improved.

Description

technical field [0001] The invention relates to the fields of optical instrument technology and spectrum detection technology, in particular to a high-performance portable LIBS analysis system. Background technique [0002] Laser-Induced Breakdown Spectroscopy (LIBS for short) is an analytical technique that gathers pulsed laser light onto the surface of a sample to form plasma, and then analyzes the plasma emission spectrum to determine the elemental composition and content of the sample. LIBS uses pulsed laser as the excitation source, which has many advantages compared with traditional analysis methods. Therefore, LIBS technology has been widely used in many fields such as environmental pollution detection, space exploration, material analysis and cultural relic identification. At the same time, LIBS is very suitable for in-situ and online detection of samples in various physical states in the process of industrial on-site production. However, due to the complexity of th...

AI Technical Summary

Problems solved by technology

However, due to the complexity of the laser-target and laser-plasma interactions, the time transient and spatial gradient inhomogeneity of the plasma during spectral acquisition, the plasma is vulnerable to the physical and chemical properties of the sample surface and its environment. The influence of other factors, resulting in poor repeatability of LIBS signals, resulting in low accuracy of qualitative and quantitative analysis, which seriously restricts the commercialization and industrial application of LIBS technology

[0003] At present, although the desktop instruments based on LIBS technology have superior performance, they have disadvantages such as large size, difficult handling, and need for external power supply, which cannot effectively utilize the in-situ online analysis capability of LIBS technology.

Due to the limitation of internal space, the existing portable LIBS analyzer can only use low-energy laser as the excitation light source (tens to hundreds of microjoules) and a simple optical path, which is only suitable for the analysis of metal samples, and the analysis performance is insufficient

Images