SAR-based GPR multi-layer steel mat parameter detecting method

A technology of parameter detection and steel mesh, which is applied in the field of SAR-based GPR multi-layer steel mesh parameter detection, can solve problems such as slow speed, and achieve the effect of improving detection efficiency, GPR image resolution and recognizability

Active Publication Date: 2018-08-07
NANJING INST OF TECH
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Problems solved by technology

[0004] Purpose of the invention: In order to overcome the problem that the existing detection technology requires manual parameter calculation and the speed is extremely slow, and realize automatic parameter extraction, this invention proposes a SAR-based GPR multi-layer steel mesh parameter detection method

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  • SAR-based GPR multi-layer steel mat parameter detecting method
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  • SAR-based GPR multi-layer steel mat parameter detecting method

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] The present invention is divided into three parts: 1. preprocessing; 2. 2-D offset imaging; 3. automatic extraction of image parameters. These three parts are explained separately below.

[0036] 1) Data preprocessing

[0037] In ground penetrating radar data, reflected waves caused by radar waves at different interfaces or noise in the environment will always appear at the same time position in the one-dimensional A-scan, and these clutters will produce a line in the two-dimensional B-scan image Horizontal line, which may obscure the target location. In addition, the electromagnetic wave of the transmitting antenna is reflected by the surface of the medium or directly received by the radar receiving antenna with the largest energy, which will be superimposed on the effective signal of the target. The target echo is submerged, thus forming a strong direct wav...

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Abstract

The invention provides a SAR-based GPR multi-layer steel mat parameter detecting method. The method comprises: step one, a GPR scanning image is preprocessed and noises and direct waves in the scanning image data are eliminated; step two, the GPR scanning image after preprocessing is processed b using an aperture synthesis technique, so that an offset image is obtained; and step three, steel mat parameters are extracted layer by layer from top to bottom in the offset image and a reinforcing steel bar horizontal direction interval and a reinforcing steel bar depth of each layer of steel mat areobtained. According to the invention, with the migration imaging technique, the GPR image resolution and recognizability are improved effectively. During the calculation process, the prior knowledgeis obtained easily by using the GPR detection system and thus automatic parameter extraction of the steel mat is realized, so that the detection efficiency is improved substantially.

Description

technical field [0001] The invention relates to the field of steel mesh quality detection, in particular to a SAR-based GPR multi-layer steel mesh parameter detection method. Background technique [0002] Ground Penetrating Radar (GPR) originated in 1904 when the German Hulsmeyer used electromagnetic wave signals to detect underground metal objects. In 1910, Letmbach and Lowy proposed the detection of buried objects using electromagnetic waves in their patent. In 1926, Hulsenbech used pulse wave technology to detect the structure of buried media for the first time, and found that the interface of media with different dielectric constants would produce electromagnetic wave reflection, which became the basic theoretical basis for ground penetrating radar research. In 1929, Stern applied ground penetrating radar to practice to measure the thickness of glaciers. Since then, ground penetrating radar has been mainly used for deep detection. With the development and application ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/15G01B7/26
CPCG01B7/15G01B7/26
Inventor 焦良葆曹雪虹田家乐夏天刘传新
Owner NANJING INST OF TECH
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