Detection system for determining damaged parts of concrete structure by acoustic-emission computed tomography

Abstract

The invention discloses a detection system for determining damaged parts of a concrete structure by acoustic-emission computed tomography. The system comprises a multichannel acoustic-emission acquisition system, a movable detection plate and a PLC controller, which are successively connected. According to the movable detection plate, one face is provided with 8-16 multifunctional preamplifiers and 8-16 low frequency sensors which are arranged in a ring array on a concrete structure, and the other face is provided with a fastening device which is compressed on the concrete structure. Each multifunctional preamplifier is corresponding to one low frequency sensor. A Matlab software platform is arranged inside the PLC controller. By using acoustic emission events as point sources, the Matlab software platform obtains slowness graphs of acoustic wave velocity variation reconstructed object structure defects according to the set ART algorithm reconstruction technique, so as to determine the damage locations of the concrete structure. According to the detection system, slowness graphs of the concrete structure in various directions can be timely obtained as much as possible through the acoustic emission technique in the concrete detection system, and each defect structure of the concrete structure can be more accurately detected.

Description

technical field [0001] The invention relates to the technical field of application of acoustic emission tomography technology in damaged parts of concrete structures, in particular to a detection system for determining damaged parts of concrete structures by acoustic emission tomography. Background technique [0002] Tomography (Computed Tomography, referred to as CT) technology (also known as computerized tomography technology) refers to the technology of reconstructing the internal (cross-section) information of the object through the data detected outside the object. Form a series of thin slices, respectively give the image of the object on each slice, and then superimpose the series of images to obtain the overall image of the interior of the object. It is a reconstruction technology from data to image, which mainly reflects the internal quality of the tested material or workpiece through the image, and conducts qualitative and quantitative analysis of defects, thereby i...

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Problems solved by technology

However, the CT algorithm requires a complete data set, and the projection data needs to be collected at equal intervals in the range of 0° to 360°, which is limited in engineering applications, especially in the field of acoustic emission. Industrial CT projection angles are limited, and the amount of projection data is small. Reconstruction is difficult to obtain a complete dataset for this case

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