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Ultrasound array imaging method

A technology of ultrasonic array and imaging method, which is applied in the direction of material analysis, measurement device, and instrument using sonic/ultrasonic/infrasonic waves, can solve problems such as serious noise, and achieve improved imaging results, improved detection performance, and improved signal-to-noise ratio. Effect

Active Publication Date: 2014-01-15
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

Although ultrasonic array technology can improve signal strength, the noise problem is also serious when the detection area is far away

Method used

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Embodiment Construction

[0017] The technical solutions of the present invention will be further described in detail below through the accompanying drawings and embodiments.

[0018] Ultrasonic array imaging technology is a method of non-destructive testing of components in the industry based on ultrasonic array transducers using ultrasonic longitudinal waves or transverse waves. like figure 2 As shown, the schematic diagrams of scanning the test block by using the ultrasonic array longitudinal wave and generating the shear wave through the wedge block are respectively given. figure 2 (a) By controlling the delay of different array elements, the angle of the incident longitudinal wave is changed to achieve the purpose of imaging the fan-shaped area. This method is called B-mode imaging. figure 2 (b) Control the delay of different array elements, and make the incident longitudinal wave obliquely incident on the part along the interior of the wedge, so as to achieve the purpose of imaging the fan-sh...

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Abstract

The invention discloses an ultrasonic array imaging method. The method comprises the following steps: performing wave beam forming processing according to signals collected by all array elements in an ultrasonic array, increasing the signal noise ratio of ultrasonic scanning line signals through space array gain, performing wavelet threshold denossing processing according to scanning line signals subjected to beam forming processing, performing envelope demodulation according to the ultrasonic scanning line signals subjected to wavelet threshold denossing processing, so as to envelopes of scanning signals, and performing image transformation processing on an image formed by scanning line envelope signals, so as to obtain a corrected scanned image. According to the invention, the wavelet deformation and ultrasonic array are combined, a wavelet threshold denossing method is adopted to further increase the signal noise ratio while the array space gain is obtained, the ultrasonic array imaging effect is greatly improved, and the testing performance of ultrasonic array to far field defects is improved.

Description

technical field [0001] The invention relates to an ultrasonic array nondestructive testing technology, in particular to an ultrasonic array imaging method. Background technique [0002] Ultrasound array imaging is of great significance for non-destructive testing and has been widely used in recent years. Ultrasonic array probing offers great flexibility and can detect irregularly shaped parts. Compared with the traditional single-array element flaw detection system, it has the advantages of large detection area, high signal-to-noise ratio, and intuitive detection results. Commonly used array working modes include column scanning, sector scanning and focus scanning, etc. The scanning range and accuracy of ultrasonic testing in different working modes are different. At the same time, ultrasonic array technology can also be used to detect complex materials such as composite materials. [0003] In ultrasonic non-destructive testing, the material to be tested often contains co...

Claims

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Application Information

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IPC IPC(8): G01N29/32G01N29/44
Inventor 吴文焘李平肖灵
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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