Full focus imaging beam calibration method

Abstract

The invention discloses a full focus imaging beam calibration method. According to the method, a beam calibration matrix is established by amplitude information of a horizontal through hole in an actual measured standard test block so as to compensate acoustic energy attenuation. The calibration method comprises the following steps: making a standard test block; acquiring and storing full matrix data; extracting full matrix sub-data; performing full focus imaging on each full matrix sub-data; extracting the amplitude information of the horizontal through hole and generating original calibration data; performing linear interpolation calculation on the original calibration data to generate the beam calibration matrix; and performing beam calibration on full focus imaging. According to the method disclosed by the invention, the quantitative defect detection errors and the missing detection rate can be effectively reduced, and the full focus imaging energy uniformity is improved.

Description

technical field [0001] The invention relates to a sound beam calibration method for full focus imaging, which belongs to the field of non-destructive testing. Background technique [0002] Phased array ultrasonic testing technology is a mature ultrasonic testing method based on ultrasonic array probes. This technology realizes the focusing and deflection of the sound beam by controlling the excitation time of each array element in the ultrasonic array probe, so as to obtain better imaging results. . With the continuous popularization of phased array ultrasonic testing technology, the research of various advanced post-processing imaging algorithms has attracted more and more attention. [0003] The all-focus imaging algorithm is an emerging ultrasonic post-processing imaging technology in recent years. This technology first makes each array element in the ultrasonic array probe emit ultrasonic waves in turn, and all the array element elements independently receive ultrasonic...

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Problems solved by technology

However, the acoustic beam calibration of the above-mentioned omni-focus imaging all adopts the theoretical calculation method. In the theoretical formula, only the acoustic wave frequency, the sound velocity of the longitudinal / transverse wave and the material density are considered, but the factors that actually affect the attenuation of the acoustic wave energy are far more than these, and the actual detection There is also a certain difference between the actual parameter values ​​of the ultrasonic array probe and the material to be tested and the theoretical calculation value, which leads to the large quantitative detection error of the sound beam calibration method proposed in the above paper, which is not suitable for the quantitative evaluation of actual ultrasonic testing.

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