Defect detecting method of concrete

Abstract

The invention relates to a defect detecting method of concrete. The defect detecting method of the concrete includes the following steps of sequentially transmitting large-time large-bandwidth linear frequency modulation signals at different positions of the space, receiving echo signals, compressing the broad-pulse linear frequency modulation signals in a time domain into a short time quantum, with regard to the echo signals, conducting coherent stack treatment on the echo signals at different positions according to the spatial position and the phase relation, forming equivalent a large aperture image, and identifying defects of the concrete based on the large aperture image. The defect detecting method of the concrete combines the pulse compression technology and a synthetic aperture imaging detection method, improves the signal to noise ratio and the resolution of the detection signals, and is beneficial to detection of the defects of the concrete, especially small defects.

Description

technical field [0001] The invention relates to the field of acoustic detection, in particular to a concrete defect detection method. Background technique [0002] At present, ultrasonic testing is widely used in the field of engineering geophysics, especially in the defect detection of large-volume concrete such as dams, bridges, and tunnels. The accuracy of ultrasonic testing results is directly related to the safety and quality evaluation results of the project. [0003] The pulse-echo method uses a single-send-single-receive method to detect defects. Ultrasonic waves travel a long distance in the inspected component, and the echo signal after the energy is greatly attenuated is often submerged in the noise, making it difficult to identify the defect signal. The ultrasonic phased array focuses the sound beam to a specific area, thereby increasing the signal-to-noise ratio of the echo signal. Phased array technology is beneficial in improving the penetration distance and...

AI Technical Summary

Problems solved by technology

Phased array technology is beneficial in improving the penetration distance and signal-to-noise ratio, but this technology requires complex hardware and software control systems, and there are still certain difficulties in beam control of array signals in complex media

At the same time, the on-site detection conditions are relatively complicated, and there are certain difficulties in the layout of transducers with large apertures.

[0004] At present, there is no solution that can improve the signal-to-noise ratio and resolution of ultrasonic testing and is easy to implement

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