A method of generating ultrasonic gyro-deflection based on frequency control

A technology of frequency control and ultrasound, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, sound wave re-radiation, and instruments. The problem of stealth of the emission source and the effect of ensuring safety

Active Publication Date: 2018-12-07
HARBIN ENG UNIV
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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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  • A method of generating ultrasonic gyro-deflection based on frequency control
  • A method of generating ultrasonic gyro-deflection based on frequency control
  • A method of generating ultrasonic gyro-deflection based on frequency control

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Embodiment Construction

[0021] The present invention will be described in more detail below with examples in conjunction with the accompanying drawings.

[0022] According to the Huygens-Fresnel principle, any point on the advancing wave front can be regarded as a new secondary wave source, and the envelope formed by many secondary waves emitted from each point on the wave front is the original source. A new wavefront propagated by a wavefront within a certain period of time. Such as figure 1 As shown, when the two array elements emit ultrasonic pulses according to certain frequency rules, the traveling waves will interfere to form a new envelope surface, realizing the generation of ultrasonic gyroscopic deflection.

[0023] Step 1: Perform frequency control. According to the curvature change of the convolved beam, the electrical excitation signal is linearly up-converted, and the transmission frequency is controlled according to the required beam pointing.

[0024] Step 2: Calculate the delay ti...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/06G01S7/524G01N29/26
CPCG01N29/262G01N2291/023G01N2291/0289G01N2291/106G01N2291/269G01S7/524G01S15/06
Inventor 康维新李衡
Owner HARBIN ENG UNIV
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