Device and method for detecting heavy metal cadmium in leaves of leafy vegetables
A technology for leafy vegetables and heavy metals, which is applied in measuring devices, color/spectral characteristic measurement, instruments, etc., to achieve the effects of accurate detection, improved detection accuracy, and short running time.
Active Publication Date: 2021-02-12
湖北恒毅农业开发有限公司
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At present, there are few research reports on the quantitative detection of internal components of crops using terahertz spectroscopy
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[0037] The invention proposes a detection device for heavy metal cadmium in leafy vegetables based on visible light and terahertz fusion spectrum technology, including a terahertz emitter, a terahertz detector, an off-axis parabolic mirror, an electronically controlled sample stage, and a visible light image camera , halogen light source, instrument stand and computer;
[0038] The terahertz emitter, terahertz detector and off-axis parabolic mirror are all fixed on the support; the electronically controlled sample stage is used to place the sample, and is fixed on the metal plate together with the support to form a transmission-type solar system. Hertz time-domain spectroscopy system (THz-TDS); the metal plate, electronically controlled detection rocker and electronically controlled light source rocker are respectively fixed on the instrument stand, and the electronically controlled detection rocker and electronically controlled light source rocker The visible light image came...
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The invention discloses a detection device and method for heavy metal cadmium in leaves of leafy vegetables based on visible light and terahertz fusion spectrum technology. The detection device includes: a terahertz emitter, a terahertz detector, an off-axis parabolic mirror, an electronically controlled sample stage, Visible light image camera, halogen light source, measurement module, control module, analysis module, mode conversion key, computer, etc. During the detection process, the acquisition mode is switched by the mode conversion key, and the visible light spectrum and the terahertz spectrum of the sample are collected respectively. A high-precision detection method for the heavy metal cadmium content in leaves is proposed. The visible light spectrum and the terahertz spectrum are selected by the competitive adaptive reweighted sampling method and the iterative information variable method respectively. On the basis of fusing the characteristic spectra, a new swarm intelligence algorithm is used —The gray wolf optimization algorithm optimizes the parameters of the least squares support vector machine, and establishes a quantitative regression model for heavy metal cadmium in leaves to achieve rapid, accurate and non-destructive detection of cadmium content.
Description
technical field [0001] The invention relates to a detection device and method for heavy metal cadmium in leaves of leafy vegetables based on visible light and terahertz fusion spectrum technology, and belongs to the technical field of agricultural product detection. Background technique [0002] Vegetables are an indispensable food in people's life and the main source of human intake of inorganic salts and vitamins. Vegetables are sensitive to environmental conditions during the growth process. The increase in industrial "three wastes" and the long-term use of chemical fertilizers have made soil heavy metal pollution increasingly serious. Cadmium is one of the most common heavy metal pollution elements in soil. It exhibits strong chemical activity and biological toxicity in soil, and is more easily absorbed by crops through soil, among which leafy vegetables have the strongest absorption capacity. Vegetables contaminated by cadmium contain a high level of cadmium accumulati...
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IPC IPC(8): G01N21/31G01N21/3563G01N21/3586
CPCG01N21/3103G01N21/3563G01N21/3586
Inventor 孙俊丛孙丽毛罕平武小红张晓东杨宁陈勇
Owner 湖北恒毅农业开发有限公司