LIBS soil detection method, system and equipment for realizing self-adaptive spectral line balance

Abstract

The invention provides a LIBS soil detection method, system and equipment for realizing self-adaptive spectral line balance. The method comprises the following steps of exciting laser to be emitted ata maximum energy value, attenuating according to a first attenuation degree and then emitting to the surface of a to-be-detected sample to obtain an original spectrum, calculating the maximum intensity value of the original spectrum, comparing the maximum intensity value with a spectrograph measurement range standard value, and adjusting the first attenuation degree, obtaining a standard spectrumfor the to-be-detected sample, obtaining a laser splitting value, and calculating a laser energy measurement value, acquiring a spark image of the to-be-detected sample, determining the boundary of the spark image, and calculating the spark area and spark intensity, and taking the spark area and the spark intensity as operation parameters, forming a sequence with a standard spectrum and a laser energy measurement value, and entering a neural network algorithm to obtain a final spectrum. By means of the method, spectrum correction is conducted through the spark area, the spark intensity, the standard spectrum and the laser energy measurement value parameters, the obtained final spectrum line is balanced, reliability is high, and the reliability of spectrum analysis is improved.

Description

technical field [0001] The present disclosure generally relates to the technical field of LIBS detection, and specifically relates to a LIBS soil detection method, system and equipment for realizing adaptive spectral line equalization. Background technique [0002] LIBS (Laser Induced Breakdown Spectroscopy) laser-induced breakdown spectrometer uses high peak power pulsed laser to irradiate the sample, and the beam is focused to a small analysis point. In the laser-irradiated spot area, the material in the sample is ablated and stripped away, forming a cloud of nanoparticles above the sample. Since the peak energy of the laser beam is quite high, its absorption and multiphoton ionization effects increase the opacity of the gas and aerosol clouds generated above the sample, even when excited by only a short laser pulse. As the energy of the laser light is significantly absorbed by the cloud, a plasma gradually forms. The high-energy plasma melts the nanoparticles, exciting ...

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Problems solved by technology

[0004] 1. Corresponding to different sample materials, the photon energy emitted by the laser excitation is also different. Therefore, when the sample surface is excited by the set value, the spectrum drawn by the spectrometer is prone to over-range spectral intensity or low maximum spectral intensity. , affecting the test results

[0005] 2. When drawing the spectrum, the excitation energy on the surface of the sample is an important parameter. For the laser device, due to the reflection of the mirror or the attenuation of the optical path, the setting value of the laser is greater than the excitation energy value injected into the surface of the sample, which is Inaccurate resulting in final plotted spectral data

[0006] 3. Due to the influence of the test environment or equipment, the drawn spectral image is prone to unbalanced spectral lines, resulting in inaccurate measurement results

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