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Concrete hidden-crack detection method and system based on contact-type ultrasonic waves

A technology for crack detection and concrete, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and measuring devices. It can solve problems such as low sound energy efficiency and insufficient accuracy of detection results. , to achieve the effect of increasing the sound energy input rate

Inactive Publication Date: 2017-07-21
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent application 201010290303.3 discloses a method and system for discovering hidden cracks in concrete by using ultrasonic selective excitation, but the method and system do not fully consider the characteristics of the concrete medium to be detected, resulting in low efficiency of sound energy entering the concrete and poor detection results. Accuracy is not good enough

Method used

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  • Concrete hidden-crack detection method and system based on contact-type ultrasonic waves
  • Concrete hidden-crack detection method and system based on contact-type ultrasonic waves
  • Concrete hidden-crack detection method and system based on contact-type ultrasonic waves

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Embodiment approach

[0031] This embodiment specifies the implementation of the method of this method, which specifically includes the following steps:

[0032] 1) Using contact ultrasonic excitation, a copper sheet is used as a coupling between the ultrasonic excitation head and the surface of the concrete component to be tested, and the ultrasonic wave is input into the concrete component to be tested to excite it; the thickness of the copper sheet is 0.5-1mm; The sheet is placed as a gasket between the concrete member and the contact surface of the ultrasonic excitation head (the structure of the copper sheet is as follows image 3 shown), or cover the excitation head with copper sheet (such as Figure 8 shown), forming an integral structure with the excitation head;

[0033] 2) Obtain a thermal image of the concrete component under test by using an infrared thermal imager;

[0034] 3) Determine the position of the crack in the concrete member according to the local high-temperature position ...

Embodiment 2

[0050] This embodiment specifically illustrates the implementation of the system of this invention, specifically as follows:

[0051] Such as figure 1 As shown, a concrete hidden crack detection system based on contact ultrasonic waves includes an ultrasonic source 1, an ultrasonic excitation head 2 and an infrared thermal imager 3. The ultrasonic source 1 is connected to the ultrasonic excitation head 2 through a cable 11. The ultrasonic The excitation head 2 is in contact with the concrete component 4 to be tested for ultrasonic excitation. The infrared thermal imager 3 is used to monitor the thermal image of the concrete component 4 to be tested. The contact surface of the ultrasonic excitation head 1 and the concrete component 4 to be tested is There is a copper sheet 5 as a coupling.

[0052] Refer to Example 1 for optimal parameter settings of ultrasonic excitation.

[0053] The ultrasonic excitation head is selected from an ultrasonic spot welding gun or an ultrasonic v...

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Abstract

The invention discloses a concrete hidden-crack detection method and system based on contact-type ultrasonic waves. The concrete hidden-crack detection method adopts contact-type ultrasonic excitation, a supplementing red copper sheet between an ultrasonic excitation head and the surface of a concrete member to be detected serves as a coupler, ultrasonic waves are input into the concrete member to be detected to excite the member, a thermal infrared imager is utilized to obtain a to-be-detected concrete member heat image, and the position a crack in the concrete member is determined according to the local high-temperature position in the to-be-detected concrete member heat image. The method and system adopts a contact-type ultrasonic excitation mode and is supplemented by the red copper sheet serving as the coupler. Compared with colloid coupling agents adopted in conventional ultrasonic detection, for example, vaseline and butter, acoustic impedance matching between an ultrasonic excitation head and an excited object can be well achieved, and improvement of sound power input rate is promoted.

Description

technical field [0001] The invention belongs to the technical field of concrete quality detection, and in particular relates to a method and system for detecting hidden cracks in concrete based on contact ultrasonic waves. Background technique [0002] Hidden cracks in the present invention refer to closed cracks invisible to the naked eye or cracks whose width is very small and beyond the resolution of the human eye, rather than cracks covered in intact concrete. Hidden cracks are the early stage of visible crack development, which is of great significance for judging the safety of concrete structures. Patent application 201010290303.3 discloses a method and system for discovering hidden cracks in concrete by using ultrasonic selective excitation, but the method and system do not fully consider the characteristics of the concrete medium to be detected, resulting in low efficiency of sound energy entering the concrete and poor detection results. The accuracy is not good eno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/06G01N25/72
CPCG01N29/069G01N25/72G01N2291/0232
Inventor 汤雷贾宇王宏王海军谢炀
Owner NANJING HYDRAULIC RES INST
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