Ultrasonic cyclotron deflection generation method based on frequency control

Abstract

The invention provides an ultrasonic cyclotron deflection generation method based on frequency control. The ultrasonic cyclotron deflection generation method comprises the steps of step one: frequency control: linear frequency ascending is performed on electric excitation signals according to the curvature change of cyclotron beams so that beam pointing control transmitting frequency is formed; and step two: the step of delay time calculation: ultrasonic transmitting delay time of each array element is calculated according to the acoustic path difference between the array elements and the cyclotron beams so that the condition of the same frequency of ultrasonic coherence can be met, then the delay time is stored and the electric excitation pulse signals are controlled to be transmitted. Linear frequency ascending is performed on the array element excitation pulses according to the required demands of the cyclotron beams, delay control of array element transmitting time is performed, and the transmitted ultrasonic waves form a synthetic wave front in the space through interference so that ultrasonic cyclotron deflection can be realized. The problems that the theoretical method of the field of underwater target detection and nondestructive detection based on the ultrasonic waves mainly concentrates on the linearly transmitted beams and cannot meet the detection and inspection requirements can be overcome.

Description

technical field [0001] The invention relates to a method for industrial non-destructive testing and underwater target detection. Specifically, it is a method for generating ultrasonic gyro-deflection based on frequency control. Background technique [0002] Non-destructive testing is based on the premise of not damaging the adaptability of the tested object, applying various physical principles and chemical phenomena to carry out effective inspection and testing of various engineering materials, parts and structures. To evaluate their continuity, integrity, safety and reliability. The five conventional non-destructive testing methods mainly include radiographic testing, ultrasonic testing, penetrant testing, magnetic particle testing, and eddy current testing. [0003] Ultrasonic testing is one of the important methods of non-destructive testing in the industry. When the ultrasonic transducer emits ultrasonic waves into the object to be detected, the ultrasonic waves propa...

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Problems solved by technology

[0005] The existing ultrasonic-based underwater target detection and industrial non-destructive testing and other theoretical methods are all concentrated on the basis of linearly propagated beams. The patent document with the application number 201310087409.7 discloses "a broadband phased array based on true delay In the "beam forming method", the synthesis is also a linear beam. The beam synthesis of the linear propagation is convenient, and the signal processing is also convenient, but it is difficult to meet the requirements of complex structure defect point detection.

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