Portable laser probe component analyzer based on optical fiber laser

Abstract

The invention discloses a portable LIBS (Laser Induced Breakdown Spectroscopy) analyzer based on an optical fiber laser. The analyzer comprises a laser detection head and a main machine system, wherein the detection head comprises a laser output end, a diaphragm, a reflector, a dichroscope, a lens, a first micro displacement table, a second micro displacement table and a light collector; the main machine system comprises a spectrograph, a microcontroller, a portable PC (Personal Computer) and an optical fiber laser main machine. The analyzer disclosed by the invention uses the optical fiber laser as a laser light source and provides a novel spectrum collecting manner, the detection sensitivity is improved and the detection limit is reduced. When the analyzer is additionally provided with a polarizer, the analyzer further can inhibit interference of a continuous background in a plasma spectrum, so that the detection sensitivity is further improved. The analyzer provided by the invention is small in size, light in weight, convenient to carry, simple to operate and fast to analyze, can be used for real-time detection in a field environment or an industrial field, and is free from a vacuum environment and pretreatment on a sample. The size and electrical conductivity of the analyzed sample are not limited, so that the analytical efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of laser precision detection, and specifically relates to a fiber laser-based portable laser probe component analyzer (abbreviated as a portable LIBS laser probe device), which is mainly used for qualitative and quantitative analysis of material element components. Background technique [0002] Laser Induced Breakdown Spectroscopy (LIBS for short) is a new type of material composition analysis technology. It focuses a pulsed laser beam on the surface of a sample to ablate it to form a plasma and emit a spectrum. By collecting the plasma spectrum Analyze the composition and content of its elements. Compared with traditional analytical instruments, LIBS technology has significant technical advantages, such as no sample preparation, rapid analysis, simultaneous detection of multiple elements, low detection limit, low cost, etc., and can be used to detect solid, liquid and gaseous substances, etc. . [0003] H...

AI Technical Summary

Problems solved by technology

Some lasers require constant temperature, dry environment, etc., so it is impossible to move the huge instrument to the harsh environment of the field or the industrial site for detection and analysis; at the same time, because the energy fluctuation of the Nd:YAG laser is generally relatively large, the error of the measurement result is relatively large, which affects Improve the detection accuracy and stability of the LIBS system

[0005] Secondly, in order to enhance the plasma spectral intensity, some current LIBS systems often adopt some auxiliary measures, such as filling protective gas, evacuating, electric spark or microwave heating, etc. The addition of these auxiliary devices often requires a special sample The size of the sample chamber greatly limits the size of the target sample, especially the component analysis of large-sized samples cannot be completed, nor can real-time monitoring be carried out at the industrial site

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