Measurement and compensation calibration method for full-focus phased array three-dimensional ultrasonic field

Abstract

The invention relates to a measurement and compensation calibration method for a full-focus phased array three-dimensional ultrasonic field. The measurement and compensation calibration method comprises the following steps: selecting a test block, taking an area array probe, setting the size (length, width and height) of a target area measured by the area array probe; drawing a probe starting point, a probe moving distance and a probe moving path on the test block; initially setting a three-dimensional full-focusing phased array detection system, scanning and continuously collecting ball bottom hole signals, carrying out real-time merging processing on three-dimensional images, fitting and storing three-dimensional ultrasonic field signals according to the merged three-dimensional images,calculating a corresponding coefficient compensation matrix according to the three-dimensional ultrasonic field signals, and calibrating the full-focus phased array detection system by utilizing the calculated coefficient compensation matrix. The method has the advantages of being high in speed, high in precision, wide in coverage range, easy to learn and master and easy to operate.

Description

technical field [0001] The invention relates to an ultrasonic welding seam detection technology, in particular to a method for measuring and compensating and calibrating an all-focus phased array three-dimensional ultrasonic field. Background technique [0002] The phased array Total Focusing Method (TFM) imaging principle based on Full Matrix Capture (FMC) was first proposed in 2005 by Caroline Holme of the University of Bristol, UK. Research hotspots in the field of detection and imaging. Relevant studies and experiments have shown that compared with other ultrasonic inspection-imaging methods, the all-focus phased array technology has a series of advantages, such as large detection coverage, higher sensitivity to small defects, image signal-to-noise ratio and defect imaging resolution. The force is also higher. [0003] In the past ten years, the research on all-focus phased array technology has mainly focused on theoretical research and instrument research and developm...

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Problems solved by technology

[0035] To sum up, there are many problems in the weld detection of the all-focus phased array technology. The amount of signal acquisition and data processing is huge when the all-focus phased array technology is applied. Most of the traditional concepts and conventional methods used in the past ultrasonic technology application cannot be applied to the all-focus phased array technology. Phased array technology, conventional pulse echo ultrasound and ordinary phased array ultrasound used in the past are slow to complete parameter setting and system calibration, with poor accuracy, insufficient coverage, difficult to learn and master, complicated operation, generally takes half an hour, or even more Long, the traditional method uses the highest wave measurement method of a single hole. When measuring, the probe needs to be moved back and forth to find the highest wave signal. During the measurement of holes with different depths, the instrument gain must be changed from time to time. Only one reflector can be used as a measurement at a time. target, while covering the detection area requires measuring multiple reflectors, which can only be carried out one by one

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