A current-carrying laser-induced breakdown spectroscopy on-line composition analyzer

Abstract

The invention relates to a current-carrying laser-induced breakdown spectrum online component analyzer, which includes four parts: a double-pulse laser-induced breakdown module, a spectrum acquisition module, a main control and data processing module, and a liquid-carrying module. The double-pulse laser-induced breakdown module adopts a double-pulse beam combining laser system, and cooperates with a beam expander focusing lens group to realize automatic focusing of the laser beam. The spectrum acquisition module adopts a three-way spectrum acquisition system, which can increase the spectrum acquisition range, improve the spectral resolution, and meet the requirements for simultaneous measurement of multiple elements. The main control and data processing module are used to control the coordination of other modules, and complete the spectrum test and data analysis at the same time. The liquid-carrying module can generate a stable vertical beam, and the beam is a steady laminar flow, which is suitable for the online composition detection of Newtonian liquids. At the same time, the module can protect the droplet sputtering during the detection process and reduce the optical cost of the online composition detection equipment. The contamination of components can greatly improve the usability and maintainability of testing equipment.

Description

technical field [0001] The invention relates to the field of liquid component detection, in particular to a current-carrying laser-induced breakdown spectrum online component analyzer. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS) detection technology is a spectral analysis technology. Its principle is to focus the pulsed laser on the surface of the sample to induce plasma, and use a spectrometer to analyze the emission spectrum after breakdown, so as to obtain the Element content and distribution. It has the advantages of fast detection speed, no need for sample preparation, and simultaneous detection of multiple elements. At the same time, LIBS detection technology can also be applied to samples of different forms, such as solid samples, liquid samples, and gas samples. Affected by various factors, the detection of liquid samples 500 is generally more difficult than solid samples and gas samples. [0003] Taking phosphate rock slurry as an exa...

AI Technical Summary

Problems solved by technology

[0005] Using laser-induced breakdown spectroscopy (LIBS) detection technology is an excellent solution to realize the on-line detection of more than 500 elements in liquid samples such as ore pulp, but the following problems still need to be solved: 1. Due to the water content in the liquid sample 500 Large, due to evaporation, droplet sputtering, etc., the laser energy at the time of breakdown will be reduced, and the collected spectral energy will also be reduced. Generally, the detection of liquid samples requires a higher laser energy.

2. To realize the detection of 500 elements in a liquid sample, it is necessary to collect a wide breakdown emission spectrum and require a high spectral resolution. Usually, the spectrometer with an echelle grating can meet the above requirements, but this kind of spectrometer is expensive. How economical? The realization of wide spectral range and high spectral resolution is one of the key issues to be solved

4. When the laser-induced breakdown of the pulp sample, due to the high temperature and high pressure of the plasma, the liquid sample 500 at the breakdown will be strongly sputtered, which will affect the collection of the plasma-induced emission spectrum, and even pollute it in severe cases optical system

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