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...

Examples

Embodiment 1

[0043] like figure 2 As shown, Embodiment 1 of the present invention provides a focused acoustic array imaging method, including the following steps:

[0044] Step 1) using an acoustic array of M array elements, and adopting a single array element to transmit all array elements to collect all echo data in the imaging area, which is recorded as full matrix data;

[0045] The value of the mth row and the nth column of the full matrix data is: the mth array element is the transmitting array element, and the nth array element is the entire echo data of the imaging area of ​​the receiving array element.

[0046] Step 2) The imaging area is gridded according to a predetermined resolution, and the imaging area is obtained according to the geometric relationship between each receiving array element and the transmitting array element at the time of direct incidence or the propagation path calculated by the collective relationship when refracted by the medium. Each pixel corresponds to t...

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...

Examples

Embodiment 1

[0043] like figure 2 As shown, Embodiment 1 of the present invention provides a focused acoustic array imaging method, including the following steps:

[0044] Step 1) using an acoustic array of M array elements, and adopting a single array element to transmit all array elements to collect all echo data in the imaging area, which is recorded as full matrix data;

[0045] The value of the mth row and the nth column of the full matrix data is: the mth array element is the transmitting array element, and the nth array element is the entire echo data of the imaging area of ​​the receiving array element.

[0046] Step 2) The imaging area is gridded according to a predetermined resolution, and the imaging area is obtained according to the geometric relationship between each receiving array element and the transmitting array element at the time of direct incidence or the propagation path calculated by the collective relationship when refracted by the medium. Each pixel corresponds to t...

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