Dielectric material damage detection system and method based on time reversal
A technology of time reversal and dielectric materials, which is applied in the analysis of materials, the use of wave/particle radiation for material analysis, measurement devices, etc., can solve the problem of low detection accuracy
Active Publication Date: 2020-09-01
XIDIAN UNIV
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[0005] The purpose of the present invention is to overcome the defects in the above-mentioned prior art, and propose a time-reversal-based dielectric material damage detection system and method, which is used to solve the technical problem of low detection accuracy in complex environments existing in the prior art
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[0043] Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail:
[0044] refer to figure 1 , the detection system of the present invention includes a time inversion mirror, a time inversion calculation module, a Fourier transform module, a damage target calculation module, a damage target judgment module, a conjugate calculation module, a sampling module, an inversion field calculation module, and a damage target calculation module. Target location screening module, wherein:
[0045] The time reversal mirror as figure 2 , including a transmit antenna A 1 and 99 periodically arranged receiving antennas B 1 ,...,B i ,...,B 99 , according to the antenna principle, the center of the array elements of the planar square array is at the center of the rectangle and has strong radiation ability, the antenna array spacing is λ / 2, the array is not easy to generate grating lobes, and it is easier to locate the dama...
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The invention provides a dielectric material damage detection system and a dielectric material damage detection method based on time reversal, thereby solving a technical problem of low detection accuracy in a complex environment in the prior art. The detection method comprises the following steps: establishing a three-dimensional coordinate system; recording receiving antenna coordinates and nodecoordinates after planing of external geometrical information of a to-be-detected dielectric material by a sampling module; collecting scattering signals of anondestructive dielectric material and the to-be-detected dielectric material by a time reversal mirror; performing time domain negation on the scattering signals acquired by the time reversal mirror by a time reversal calculation module; performing Fourier transform on the signal subjected to time domain negation by a Fourier transform module; judging whether damage exists or not by a damage target judgment module; conjugating the damage target signal by a conjugation calculation module; calculating inversion fields of all grid division nodes by an inversion field calculation module; and screening a damage target position by a damage target position screening module .
Description
technical field [0001] The invention belongs to the field of time reversal electromagnetics and antenna technology, relates to a dielectric material damage detection system and method, and can be used for small defect detection of dielectric material structures. Background technique [0002] With the development of industrialization, the problems caused by the changes of various metal and non-metal structures in our country have attracted people's attention. During the long-term service of dielectric components, there may be changes in material properties. These damages with special material properties have great harm resistance, especially in aerospace, navigation, construction, etc. and extreme conditions. There may be large-scale ablation and deformation of the physical structure, which will lead to large-scale failure and damage of the model in severe cases, which constitutes an unexpected accident. Many equipment, devices and other products have become more sophisticat...
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IPC IPC(8): G01N23/00
CPCG01N23/00
Inventor 张玉吴昊林中朝赵勋旺刘建
Owner XIDIAN UNIV