Relative excitation method for ultrasonic tomography system

Abstract

The invention provides a relative excitation method for an ultrasonic tomography system. Even-numbered piezoelectric ultrasonic sensors are uniformly distributed on the side wall of a metal pipeline in the circumferential direction, two piezoelectric ultrasonic sensors symmetrical about the axis of the metal pipeline are excited to send signals, and all other piezoelectric ultrasonic sensors are controlled to serve as receiving sensors, two signals excited simultaneously are synthesized in liquid, and the synthesized signals are received by the receiving sensors to serve as a group of component image signals; two other piezoelectric ultrasonic sensors symmetrical about the axis of the metal pipeline are simultaneously excited in sequence, and all other piezoelectric ultrasonic sensors arecontrolled to serve as receiving sensors to obtain imaging signals; image reconstruction is conduced through all the imaging signals. Accordingly, the intensity and amplitude of the ultrasonic excitation signals and the receiving signals in the ultrasonic tomography system are improved, the coverage range of ultrasound in the pipeline is enlarged, the two-phase flow detection quality and image reconstruction quality are improved, and the detection efficiency of the ultrasonic tomography system is improved.

Description

technical field [0001] The invention relates to an excitation mode of an imaging system, which is used for improving the detection quality of two-phase flow patterns in petroleum pipelines. Background technique [0002] Oil and gas mixed two-phase flow usually exists in oil pipelines. The detection of the flow state of the two-phase flow not only ensures the safety of transportation, but also helps to improve the efficiency of oil and gas mixed transportation. Ultrasound tomography is a new sensing technology for the detection of the flow state of two-phase flow. Different from other tomographic imaging technologies, this technology can be used to detect two-phase flow in metal pipelines, and has the advantages of no radiation, low cost, and good stability. However, when the ultrasonic tomography system is used to detect the gas-liquid two-phase flow in the metal pipe, because the acoustic impedance of the metal pipe and the liquid in the pipe is greatly different, only a s...

AI Technical Summary

Problems solved by technology

However, when the ultrasonic tomography system is used to detect the gas-liquid two-phase flow in the metal pipe, because the acoustic impedance of the metal pipe and the liquid in the pipe is greatly different, only a small part of the sound wave can enter the liquid in the pipe, and the detection signal becomes smaller, which brings difficulties to detection, and finally leads to the deterioration of two-phase flow pattern imaging

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