Phased array overall situation focusing system and focusing method thereof

Abstract

The invention discloses a phased array overall situation focusing system and a focusing method thereof. The phased array overall situation focusing system can transmit on a single energy converter unit by turns and all the energy converter units receive and focus transmission and receiving synthesis on echo line scanning signals of a plurality of sampling points of a space, so that the space imaging quality can be greatly improved. The phased array overall situation focusing system comprises an energy converter unit, a signal processing unit, a dynamic delay overall situation focusing compensation module and a signal overlapping module; the phased array overall situation focusing system can be used for transmitting the phased array and focusing the transmission and receiving synthesis on any one space point on a synthesis line behind a space initial focusing point; in an ultrasonic phased array control nondestructive testing application, the echo line scanning signals reflected by a pre-set sampling point with small imaging distortion and high image quality can be obtained; all depth focusing compensation requirements can also be met under refraction conditions. A traditional phased array technology can also be improved and distortion caused by the fact that defect depths are not in focusing depths is reduced; the total graph focusing effect of imaging an object to be detected can be realized.

Description

technical field [0001] The invention relates to a phased array focusing system for ultrasonic non-destructive testing, in particular to a focusing system applying phased array space focusing to global focusing and a method for ultrasonic testing using the system. Background technique [0002] The phased array ultrasonic imaging system includes a transducer unit, which is connected to the corresponding signal channel, and can realize the functions of sound wave emission (conversion of electric energy into sound energy) and sound wave reception (conversion of sound energy into electric energy). When working, the transducer unit emits ultrasonic beams to the object under test. With different transmission delays, the ultrasonic synthetic sound beams of each unit can have different angles and focus at different depths. Structure or tissue, part of the ultrasonic energy is reflected, and the transducer receives the echo and converts it into an electrical signal. Because the time ...

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Problems solved by technology

[0004] In the phased array focusing system in the prior art, during phased array detection, there is only one transmitting focus point and one receiving focus point during the sending and receiving process. If the defect position is not at the focal depth, the received wave of each transducer unit cannot Depth superposition with the same phase, superimposition appears phase difference, imaging distortion

In addition, the imaging distortion of phased array ultrasonic imaging is farther away from the focus point, and the imaging distortion is more serious, and the defect imaging is less clear.

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