A focused acoustic array imaging method and system

Abstract

The invention discloses a focused acoustic array imaging method and system. The method includes: acquiring echo data in an imaging area by using a single array element transmission and all array acquisition methods, transmitting and traversing all array elements, and obtaining all echo data as a full matrix Data; calculate the delay index table of the entire imaging area; take the main diagonal of the full matrix data as the benchmark, and calculate the reference image according to the delay index table; use the sub-diagonal data of the full matrix data, according to the delay index Table and the echo data corresponding to this sub-diagonal line calculate the focused image, and superimpose it with the reference image; continue to progress gradually to both sides until the superimposed focused image meets the image quality requirements. The focused acoustic array imaging method and system of the present invention not only improves the real-time processing speed of focused imaging, but also can obtain target images with better signal-to-noise ratio as required, greatly improving the imaging results of the acoustic array and improving the detection performance of the acoustic array.

Description

technical field [0001] The invention relates to an acoustic array imaging technology, in particular to a focused acoustic array imaging method and system. Background technique [0002] Acoustic array imaging is of great significance to industries such as industrial non-destructive testing, medical and underwater testing, and has been widely used in recent years. For the consistency and brevity of description, the following description will all take ultrasonic array inspection in industrial inspection as an example. [0003] Ultrasonic array inspection technology is based on ultrasonic array transducers, using ultrasonic longitudinal waves or transverse waves (as shown in Figure 1(a) and Figure 1(b)), a method for non-destructive testing of components in the industry. Ultrasonic array inspection technology can also be used to inspect materials with complex structures such as composite materials. This method has great flexibility and can detect irregular-shaped parts. Compar...

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Problems solved by technology

[0004] At present, the disadvantage of the full-focus acoustic array imaging technology is that it has a huge amount of data and requires a large amount of storage space; at the same time, using full-matrix data to perform focused imaging on all focal points requires a huge amount of calculation and takes a long time to calculate.

Taking a 16-element phased array probe as an example, when the sampling depth of each A-scan echo signal is 2000, a complete full-matrix data has 2MB. When performing all-focus imaging calculations, for each focus All points involve operations such as multiplication, square root, and addition, and the calculation complexity is much higher than that of traditional phased array B-scan imaging; at the same time, the all-focus imaging method only excites one array element at a time, and the emission energy is weak, resulting in The signal-to-noise ratio of the imaging system is low

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