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Vector phased array ultrasound checking

A phased array and vector technology, which is applied in the generation of ultrasonic/sonic/infrasonic waves, sound-generating devices, instruments, etc., can solve the problems of reducing the detection axial resolution and widening the echo envelope, so as to improve the axial resolution rate, waveform improvement, good effect

Inactive Publication Date: 2008-12-31
SOLID BEIJING TECH
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Problems solved by technology

In conventional phased array detection, the echo envelope will be broadened due to the influence of phase error during coherent superposition, thereby reducing the axial resolution of detection

Method used

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  • Vector phased array ultrasound checking
  • Vector phased array ultrasound checking
  • Vector phased array ultrasound checking

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Experimental program
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Embodiment Construction

[0012] Phased array ultrasonic testing is based on phased wave superposition. In industrial phased array detection, the initial sound pressure of the sound wave is small, that is, the vibration velocity of the particle is small, the Mach number is much smaller than 1, and the mutual disturbance in the superposition process is also very small, that is to say, this The process of coherent superposition and non-coherent fluctuation superposition satisfies the principle of linear superposition of small-amplitude fluctuations.

[0013] Ultrasound signals are pulse trains of finite length with finite energy. The difference between vector overlay and conventional coherent overlay is as follows figure 2 As shown, the amplitude of the higher frequency is larger, and the amplitude of the lower frequency is lower. The upper left picture shows several damping sequences with different frequencies and different amplitudes, the lower left picture is the result of incoherent superposition;...

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Abstract

The invention aims at providing a new ultrasonic detection method with a phased array, which is an ultrasonic detection method with a vector phased array that can achieve higher signal-to-noise ratio and improve axial detecting resolution in comparison with normal phased array detection. The imaging resolution of the ultrasonic detection with the phased array is an important index of detecting imaging and is an important basis for evaluating the detecting capacity of the system, and in order to improve the imaging resolution, the ultrasonic detection method with the vector phased array determines vector phase parameters that mainly include the frequencies and the phase positions of each array element in the phase array according to a preset focus point or a preset deflecting direction as well as the relationship among acoustic pressure, distance and frequency, and the method of the invention realizes focusing by utilizing the incoherent addition of ultrasonic waves with different frequencies in space.

Description

technical field [0001] The invention relates to ultrasonic detection technology, in particular to a phased array ultrasonic detection method. Background technique [0002] Ultrasonic detection often needs to image a certain area in the object, for which, sound beam scanning must be carried out. Conventional phased array ultrasonic detection is to change the phase of the sound wave emitted (or received) by each array element when it reaches (or comes from) a certain point in the object by controlling the time delay of the excitation (or reception) pulse of each array element in the transducer array. relationship, to realize the change of the focus point and the orientation of the sound beam, so as to complete the phased beam synthesis and form the imaging scanning line technology, the principle is as follows figure 1 shown. [0003] The resolution of phased array ultrasonic detection imaging is an important index of detection imaging and an important basis for measuring the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/34G10K11/26
Inventor 彭春彭波王敏
Owner SOLID BEIJING TECH