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Rapid detection method of crop nutrient elements based on collinear laser-induced breakdown spectroscopy

A technology of laser-induced breakdown and crop nutrition, applied in material excitation analysis and other directions, can solve the problems of the influence of analysis results and the small amount of laser-induced breakdown spectrum analysis, achieve convenient system adjustment, improve spectral line collection efficiency and spectral line Intensity, fast detection effect

Active Publication Date: 2017-01-11
ZHEJIANG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, due to the small amount of laser-induced breakdown spectroscopy analysis, the matrix effect has a significant impact on the analysis results

Method used

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  • Rapid detection method of crop nutrient elements based on collinear laser-induced breakdown spectroscopy
  • Rapid detection method of crop nutrient elements based on collinear laser-induced breakdown spectroscopy
  • Rapid detection method of crop nutrient elements based on collinear laser-induced breakdown spectroscopy

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Embodiment Construction

[0037] Such as figure 1 As shown, the device applicable to the fast detection method of crop nutrient elements in the present invention includes a double-pulse solid-state laser 1, a delay generator 2, an energy attenuator 3, a laser energy real-time monitoring system 4, an optical path climbing system 5, and a detector 6 , a spectrometer 7, a sample stage 8, a focusing lens 9, an optical fiber collection system 10 and a sample surface imaging system 11.

[0038] The delay generator 2 controls the trigger time of the Q-switching switch of the double-pulse solid generator 1 and the start-up trigger time of the xenon lamp. Under the control of the delay generator 2, the double-pulse solid-state laser 1 generates a coaxial 532nm (1064nm) double-pulse laser. The laser light passes through the energy attenuator 3 to attenuate the laser energy. The energy coming out of the beam splitter 32 is controlled by turning the half wave plate 31 . After attenuation, the laser light passes...

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Abstract

The invention discloses a method for rapid detection of crop nutrient elements based on collinear laser-induced breakdown spectroscopy. Focus on the surface of the sample to generate plasma; collect the characteristic spectral lines generated by plasma cooling; select the four spectral lines with the highest intensity without self-absorption and self-reversal from the characteristic spectral lines according to the nutrient elements to be measured ;Take the sample reference value as the output Y′, and use the intensity of the four spectral lines as the input to establish a variety of multiple regression models, select the four optimal models, and use the prediction results of these four models as input, and use the sample reference value Y' is used as an output to establish a comprehensive model; for the crop sample to be detected, four spectral line intensities are obtained and input into the comprehensive model described above to calculate the content of nutrient elements. The invention realizes the rapid detection of crop nutrient elements, and has the characteristics of simple operation, low cost and the like.

Description

technical field [0001] The invention relates to crop nutrient element detection technology, in particular to a crop nutrient element rapid detection method based on collinear laser-induced breakdown spectrum. Background technique [0002] Crop nutrient elements (nitrogen, phosphorus, potassium, etc.) are closely related to the growth status and yield of crops. Nitrogen, phosphorus, and potassium are the three main nutrients for crops. Nitrogen is a component of pigments, which can promote plant photosynthesis and increase crop yield; phosphorus is a component element of various compounds in crops, which has an important impact on crop quality; potassium can promote crop photosynthesis and enhance crop resistance. Obtaining the information of crop nutrient elements is beneficial to understand the growth status of crops, and realize early quantitative fertilization according to the nutrient deficiency of crops. At present, the detection methods of crop nutrient elements main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/63
CPCG01N21/718
Inventor 何勇彭继宇刘飞张初周菲孔汶汶冯雷
Owner ZHEJIANG UNIV
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