Telescoping focusing collection system and method for LIBS remote detection

Abstract

The present invention relates to a telescoping focusing collection system and a method for LIBS remote detection. According to the telescoping focusing collection system, a laser primary beam expanding system is coaxially arranged in the emitting direction of a laser generation device, a reflection system is arranged in the emitting direction of the laser primary beam expanding system, a telescoping system is coaxially arranged on one side in the laser emitting direction of the reflection system, an optical fiber coupling system is arranged on the other side of the reflection system, the optical fiber coupling system and the telescoping system are arranged coaxially, and optical fibers are arranged on the convergence focus point position of the optical fiber coupling system. With the system and the method, the laser can focus at different distances, the focused light spot is less than 1 mm, it can be ensured that the high temperature and high density plasma can be excited on the surface of the detected object, it can be ensured that the focusing light path and the collecting light path are coaxially arranged, the optimization of the focusing and the collecting at different distances is controlled with the minimum adjustment amount, and it is ensured that the wide wave band spectrum signals can be coupled into the optical fiber core diameter at different distances.

Description

technical field [0001] The invention relates to the field of optical design, in particular to a telephoto focusing collection system and method for LIBS remote detection. Background technique [0002] Laser-induced breakdown spectroscopy, referred to as LIBS technology, its basic principle is that a beam of high-energy laser is focused by a lens to generate high-temperature, high-density plasma, and the components of the sample are detected by analyzing the characteristic lines in the plasma spectrum content, due to its advantages of no sample preparation, simultaneous measurement of multiple elements, solid, liquid, gas and non-contact, rapid measurement, etc., it is very suitable for online, real-time, non-contact analysis, and has been widely used in Metallurgy, environment, archaeology, deep sea, space and other industries. [0003] At present, the development of LIBS technology has gradually developed from short-distance measurement to long-distance measurement. For ex...

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Problems solved by technology

[0003] At present, the development of LIBS technology has gradually developed from short-distance measurement to long-distance measurement. For example, it is necessary to use LIBS technology for long-distance measurement in the dangerous environment of high temperature and high radiation, cliffs, space and deep sea, etc. As the measured object changes, the measurement distance also changes accordingly. The current LIBS system either cannot focus and collect at different distances at the same time, and cannot meet the analysis and measurement at different distances; or the focusing system and the collection system are separated, so The optical system is not compact enough, and it is not easy to adjust, so the current LIBS system is not suitable for the analysis and measurement of LIBS in unknown long distances

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