System and method for detecting plant diseases based on near field acoustic holography technology

Abstract

The invention relates to a system and method for detecting plant diseases based on near field acoustic holography technology. According to acoustic emission phenomena of plants and on the theoretical basis of the near field acoustic holography technology of a distributed source boundary point method, a cylindrical surface-spherical surface non-conformal-surface acoustic holography experiment model is established, and simulation experiments on single sound sources and double sound sources are respectively carried out. By changing of parameters, in the model, such as the holographic cylindrical surface radius, holographic measuring point number, and node number on reconstruction spherical surface, distance between fictive particular solution sources and nodes on the reconstruction spherical surface, and the like, feasible experimental parameters are obtained. Simulation results show that the method can accurately identify and locate the position of an acoustic emission source. On the basis of the experimental parameters, a signal acquisition acoustic holography experiment system which adopts DSP as a core is established, and data analysis and processing are carried out by an upper computer which adopts Labview as a software platform. The system and method for detecting plant diseases based on the near field acoustic holography technology adopt plant acoustic emission signals as important sensitive information to know the growth states and disease-affected situations of the plants, and through studies of the acoustic emission signals based on the near field acoustic holography technology of the distributed source boundary point method, the diseases can be timely discovered and identified, and a new way and the new method for the prevention and control and detection of the plant diseases is provided.

Description

technical field [0001] The invention belongs to the field of agricultural biotechnology, in particular to a system and method for detecting plant diseases based on near-field acoustic holography technology. Background technique [0002] Plants are often subjected to various environmental stresses during their growth and development, among which disease stress and water deficit reduce crop yield more than the sum of all other stresses. The total area of ​​pests and diseases in the country is constantly increasing, and there are problems of excessive pesticide residues. Therefore, how to quickly, accurately and reliably judge the distribution area and degree of crop diseases in a timely manner is the key to effective prevention and control measures and precise Pesticide application is the key to disease control. [0003] Plants affected by disease stress lead to changes in plant transpiration rate and increased tension; when it exceeds a limit value, the continuum of the wate...

AI Technical Summary

Problems solved by technology

Based on the NAH technology of Fourier transform, the algorithm and experiment are easy to implement and the calculation speed is fast, but the window effect and winding error will be introduced in the reconstruction process, and the holographic surface and the source surface are required to be conformal regular shapes, such as plane, Cylindrical or spherical, etc., to a certain extent limit its scope of application

Based on the NAH technology of the boundary element method (BEM), this method effectively overcomes the restrictions on the shape of the source surface and the holographic surface. The low efficiency of its numerical calculation affects its promotion and application in engineering

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