Handheld LIBS (Laser-induced Breakdown Spectroscopy) optical system

Abstract

The invention relates to a handheld LIBS (Laser-induced Breakdown Spectroscopy) optical system which comprises a laser emitter, a detector as well as a dichroscope, a first lens, a second lens, a third lens, a concave grating and a fourth lens, wherein laser emitted from the laser emitter passes through the dichroscope and is converged by the first lens to focus light spots on the surface of a sample; characteristic light emitted from the sample is converged by the first lens, is reflected by the dichroscope, is coupled by the second lens, is transmitted by an optical fiber, is converged by the third lens and reaches a seam; the concave grating is used for splitting the characteristic light emitted from the seam; the split light is fed through the fourth lens and is detected in the detector; the seam, the concave grating and two ends of the detector are positioned on a Rowland circle circumference of which the diameter is equal to the curvature radius of the concave grating; the fourthlens is used for enabling the optical path length that the split characteristic light reaches the detector from the concave grating through the fourth lens to be equal to the optical path length thatthe split characteristic light reaches the Rowland circle circumference directly from the concave grating. The system has the advantages of being small in size, high in resolution ratio, wide in detection wavelength range, and the like.

Description

technical field [0001] The invention relates to the field of spectral analysis, in particular to a compact handheld LIBS optical system. Background technique [0002] Laser-induced breakdown spectrometer, or LIBS for short, uses a pulsed laser to generate plasma ablation and excite substances in the sample, and obtain the spectrum emitted by the atoms excited by the plasma through the spectrometer to identify the elemental composition in the sample. , and then carry out the identification, classification, qualitative and quantitative analysis of materials, which can be used not only in the laboratory, but also in the on-line detection of industrial sites. In order to facilitate on-site detection, hand-held LIBS came into being. But the current handheld LIBS has the following defects: [0003] 1. Symmetrical or asymmetrical Czerny-Turner optical systems are mostly used. This type of system requires multiple collimating mirrors and imaging mirrors, resulting in complex instr...

AI Technical Summary

Problems solved by technology

[0003] 1. Symmetrical or asymmetrical Czerny-Turner optical systems are mostly used. This system requires multiple collimating mirrors and imaging mirrors, resulting in complex structure and large volume of the instrument; or shortening the focal length in order to reduce the volume, resulting in resolution reduce;

[0004] 2. The wavelength range of the optical system is narrow, unable to cover the whole band, and there are few types of element detection

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