Omnibearing excitation method for ultrasonic tomography

A technology of ultrasonic tomography and excitation signal, which is applied in the direction of material analysis, material analysis, and measurement device using sonic/ultrasonic/infrasonic waves, which can solve the problems of low detection efficiency and poor detection quality, and achieve improved quality and detection. The effect of efficiency

Active Publication Date: 2017-06-09
BEIJING UNIV OF TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the traditional sensor excitation method has the limitations of low detection efficiency and poor detection quality. In order to improve the detection efficiency and imaging quality of the ultrasonic tomography system, the present invention provides an ultrasonic Omnidirectional Ultrasonic Excitation Method for Tomography Imaging System

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  • Omnibearing excitation method for ultrasonic tomography
  • Omnibearing excitation method for ultrasonic tomography
  • Omnibearing excitation method for ultrasonic tomography

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Embodiment Construction

[0019] An embodiment of the present invention provides an omnidirectional ultrasonic excitation method for an ultrasonic tomography system. The ultrasonic tomography system (UCT system) includes a pipe (circular pipe) with a certain wall thickness, and the pipe is filled with liquid. The liquid contains air bubbles to form a gas-liquid two-phase flow system, and the ultrasonic excitation method includes the following steps:

[0020] Step S1, arrangement of sensor groups

[0021] Such as figure 1 As shown, 1 to 16 in the figure are ultrasonic sensors, all of which have the same structure and performance parameters, and are independent of each other, capable of exciting or receiving ultrasonic signals, 17 is the pipe wall of the detection pipeline, and the material of the pipe wall is metal Or non-metallic material, 18 is the spherical air bubble in the pipeline, and 19 is the liquid (water or oil etc.) in the pipeline. 16 ultrasonic sensors form a sensor group, which are even...

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Abstract

The invention discloses an omnibearing excitation method for an ultrasonic tomography system. The omnibearing excitation method is characterized in that omnibearing excitation signals are generated through an omnibearing excitation mode of a sensor group, and the omnibearing excitation signals are gathered in the center of a pipeline to form a virtual point source; then an ultrasonic signal is continually propagated along the original path, and at the moment, the distribution of the ultrasonic signal in the pipeline is equivalent to that of a high-power omnibearing ultrasonic signal sent by the virtual point source in the center of the pipeline; the ultrasonic signal is reflected when encountering a gas-liquid-phase boundary formed by bubbles and liquid in the pipeline when being propagated in the pipeline and is finally acquired by the ultrasonic sensor group; and the acquired signal is processed to obtain a high-quality detection result. By adoption of the technical scheme, the detection efficiency can be greatly improved, errors caused by channel switching of ultrasonic sensors are avoided, the quality of the detection result is improved, and the omnibearing excitation method is suitable for the environment having relatively high requirement on the detection efficiency and the imaging quality.

Description

technical field [0001] The invention belongs to the field of multiphase flow detection and relates to an omnidirectional ultrasonic excitation method for an ultrasonic tomography imaging system. Background technique [0002] Ultrasound Computerized Tomography (UCT) technology is a non-destructive testing technology formed by applying ultrasound to Tomography (Computerized Tomography, CT) technology. Solve the propagation of ultrasonic waves inside the test piece, and invert the cross-sectional image inside the test piece, which is mainly used in petrochemical, medical diagnosis, aerospace and food engineering and other fields. The optimization of sensor excitation mode is an important issue and research direction of UCT system optimization. [0003] The traditional UCT system sensor excitation method is a single sensor excitation, other sensors receive, and repeat this step in a certain order, the number of excitation is related to the number of excitation sensors. In orde...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/22
CPCG01N29/22G01N2291/105
Inventor 李楠徐昆张旭刘秀成吕炎
Owner BEIJING UNIV OF TECH
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