Method and system for receiving dynamic focusing compensation through phased array

Abstract

The invention relates to the technical field of ultrasonic phased array nondestructive testing and in particular relates to a method and a system for receiving the dynamic focusing compensation through a phased array. A transducer group receives echo data of each transducer unit; an analog / digital (A / D) conversion circuit converts the echo data into an echo data digital electric signal; a dynamic focusing compensation circuit inserts initial focusing delay into the echo data digital electric signal and inserts unit time delay into the echo data digital electric signal at a preset position after a length data digital electric signal which corresponds to the compensation delay is started so as to obtain an echo data digital electric signal subjected to the dynamic focusing compensation; a signal superposition circuit performs data superposition on the echo data digital electric signal subjected to the dynamic focusing compensation. The initial focusing delay and the unit time delay at a preset position are inserted into the echo data digital electric signal, so that the time delay of the echo data digital electric signal focused at different depths can be dynamically compensated, the imaging distortion at each depth is reduced after the compensation, and the image quality is improved.

Description

technical field [0001] The invention relates to the technical field of ultrasonic phased array nondestructive testing, in particular to a phased array receiving dynamic focus compensation method and system. Background technique [0002] As we all know, the fully automatic welding process has been widely used in many large-scale engineering and construction projects, and ultrasonic non-destructive testing has gradually replaced radiographic testing as the main detection method for large-scale welding construction. Ultrasonic phased array nondestructive testing is one of the commonly used detection methods in ultrasonic nondestructive testing. Ultrasonic phased array non-destructive testing involves a phased array ultrasonic imaging detection system. The phased array ultrasonic imaging detection system includes a set of transducer units. Energy) and sound wave reception (sound energy into electrical energy) functions. When working, the transducer unit emits ultrasonic pulses...

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Problems solved by technology

However, because ultrasonic phased array non-destructive testing has only one transmitting focus point and one receiving focus point in one transmission and reception process, the processing method of superimposing after fixed delay compensation is generally adopted. If the defect position is not at the focal depth, each transducer The echo data received by the unit cannot be superimposed in the same phase at the depth of the defect, and there will be a phase difference in the superposition, and the imaging will be distorted, and the farther the depth of the phased array ultrasonic imaging is from the focus point, the more serious the imaging distortion will be, and the less clear the defect imaging will be

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