Arrayed ectopic reception ultrasonic synthetic aperture focusing method based on nondestructive testing

Abstract

The invention discloses an arrayed ectopic reception ultrasonic synthetic aperture focusing method based on nondestructive testing. The method comprises the steps of: before data acquisition, determining a detection area and a dividing a surface to be tested into grids according to a detection horizontal resolution requirement to determine all scanning points; then, moving from left to right gridby grid along a first horizontal grid line to successively scan each point, repeating the process until all points in the area are scanned; and performing data acquisition, data processing and focusing imaging. The method introduces corresponding signal optimization modules for instantaneous amplitude extraction, scattering angle attenuation control and time gain compensation, can significantly improve the focusing ability and improve the imaging resolution.

Description

technical field [0001] The invention relates to a synthetic aperture focusing (SAFT) method for array-type ectopic receiving ultrasonic waves based on non-destructive testing. Background technique [0002] With the continuous and stable development of my country's economy, the country is increasingly strengthening infrastructure construction. High-speed (passenger dedicated line) / heavy-haul railways and expressways are the main directions for the development of railways, roads and land transportation respectively. The level of new railways and road tunnels , scale and quantity are increasing year by year. In tunnel engineering, concrete is one of the main structural materials of buildings. Concrete is a multiphase composite system, and the phases are randomly intertwined to form an extremely complex internal structure. The damage of concrete is inevitable, including physical Processes, such as freeze-thaw cycles, fire, water erosion, and chemical processes, such as carboniza...

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Problems solved by technology

[0006] The invention proposes a new SAFT imaging method based on the non-destructive testing of concrete, which utilizes the advantages of ultrasonic probe array heterogeneous reception and multi-channel data superposition, and adds a series of data optimization processing methods for the characteristics of concrete materials, which solves the problem of In the traditional non-destructive testing of concrete, the focus of ultrasonic waves is scattered, the signal-to-noise ratio is low, and the deep resolution is not enough. It can obtain high-precision B-scan profiles of the area to be tested, with higher image resolution, more accurate internal structure positioning, and improved detection efficiency. , cost saving

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