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Microwave imaging-based sandstone aggregate nondestructive testing method

A technology of microwave imaging and non-destructive testing, applied in the direction of material magnetic variables, etc., can solve problems that are difficult to realize and impossible to detect, and achieve the effect of fast and accurate data results

Pending Publication Date: 2020-10-13
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, this full-aperture imaging method is difficult to achieve in practical applications. For example, when detecting a wall, it is impossible to perform 360° all-round detection of the wall in actual situations. Irradiation and receiving field on the same or opposite surface

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  • Microwave imaging-based sandstone aggregate nondestructive testing method
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  • Microwave imaging-based sandstone aggregate nondestructive testing method

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] The non-destructive testing method for sandstone aggregate based on microwave imaging of the present invention comprises the following steps:

[0031]Step 1. Place the sand and gravel aggregates on the workbench-type assembly line 3, and use the detection equipment 1 with a limited aperture in the shape of "ㄇ" in the side profile to detect the sand and gravel aggregates passing through it to obtain the scattered field data;

[0032] Step 2. Using the obtained scattering field data, realize three-dimensional electromagnetic inverse scattering imaging based on the SOM method to reconstruct the shape and dielectric constant value of the sandstone aggregate.

[0033] like figure 1 and figure 2 As shown, the specific content of step 1 includes:

[0034] Step...

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Abstract

The invention belongs to the field of three-dimensional microwave imaging and provides a microwave imaging-based sandstone aggregate nondestructive testing method. Firstly, sandstone aggregate is placed on a workbench type assembly line; detection equipment with an ''n''-shaped side section and a limited caliber is adopted to detect sandstone aggregate passing through the detection equipment so asto acquire scattering field data; and then the obtained scattering field data is used to realize three-dimensional electromagnetic inverse scattering imaging based on an SOM method to reconstruct a shape and a dielectric constant value of the sandstone aggregate so as to detect whether the sandstone aggregate reaches a standard required by a building or not. In the invention, a unknown scattereris detected by adopting the limited caliber with the ''n''-shaped side section so that actual requirements are met better; the detection process is more convenient and automatic due to a design of anassembly line workbench; and a three-dimensional electromagnetic imaging technology is realized based on an SOM method with two significant advantages of rapid convergence and noise resistance so thatthe method can rapidly and accurately obtain a data result.

Description

technical field [0001] The invention belongs to the field of three-dimensional microwave imaging, and proposes a limited-aperture three-dimensional electromagnetic inverse scattering imaging nondestructive detection method for sandstone aggregates based on microwave imaging, which is suitable for an assembly line workbench. Background technique [0002] The most important material in construction engineering is concrete, and sand and gravel aggregates are the basic components of concrete. Therefore, the detection of sand and gravel aggregate is an important technical part to ensure the quality of the project, the guarantee of the quality of the concrete, and the guarantee of the quality of the building. Therefore, it is of great practical significance to do a good job in the detection of sand and gravel aggregates. [0003] The detection of sand and gravel aggregate is a typical three-dimensional electromagnetic inverse scattering imaging problem. Over the years, the metho...

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Application Information

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IPC IPC(8): G01N27/83
CPCG01N27/83Y02A90/30
Inventor 徐魁文张璐王忠宾
Owner HANGZHOU DIANZI UNIV
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