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Oil-gas-water three-phase medium attenuation spectrum fused multi-frequency ultrasonic tomography method

A medium-attenuation, multi-frequency ultrasonic technology, which is used in material analysis, material analysis, and measurement devices using sonic/ultrasonic/infrasonic waves.

Pending Publication Date: 2020-12-11
TIANJIN UNIV
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Problems solved by technology

The proposed method solves the problem that traditional single-modal ultrasonic tomography cannot image oil-gas-water three-phase media, and its imaging accuracy is significantly improved compared with the existing dual-modal imaging method

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  • Oil-gas-water three-phase medium attenuation spectrum fused multi-frequency ultrasonic tomography method
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  • Oil-gas-water three-phase medium attenuation spectrum fused multi-frequency ultrasonic tomography method

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Embodiment Construction

[0035] The non-uniform shape constraint-based pixel range filtering ultrasound imaging algorithm of the present invention will be described with reference to the drawings and embodiments.

[0036] The multi-frequency attenuation spectrum information fusion ultrasonic tomography method of oil-gas-water three-phase medium of the present invention, in the embodiment, aims at the common application form of tomography technology in the process of oil-gas-water three-phase flow imaging in industrial oil pipelines, and proposes a new scanning frequency excitation method The imaging strategy and the measurement model corresponding to the fusion of ultrasonic attenuation spectrum information are derived, which are used to realize the visual measurement of oil, gas and water three-phase media in a single tomographic imaging mode. Use a continuous linear frequency modulation voltage signal for excitation, and obtain the time-varying voltage signal received by the contralateral sensor in t...

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Abstract

The invention relates to an oil-gas-water three-phase medium attenuation spectrum fusion multi-frequency ultrasonic tomography method, which comprises the following steps that a certain number of ultrasonic transducers are uniformly arranged outside a measured field at equal intervals, continuous linear frequency modulation chirp signals are adopted for excitation, and an excitation probe and a receiving probe perform cyclic excitation and cyclic measurement in sequence; specific projection paths are formed between different excitation probes and receiving probe pairs; diffusion attenuation modeling is carried out, and a diffusion attenuation model is quantitatively calculated according to the relative position and deflection angle information of the excitation probes and the receiving probes; a coefficient matrix R is calculated, and an acoustic beam angle weighting correction method is proposed by using a coefficient matrix construction strategy with corrected geographical positionsto suppress artifacts caused by field domain lateral scattering; and according to the coefficient matrix R and the m * 1-dimensional vector tau of the total absorption attenuation coefficient of m projection paths in the field domain calculated in the step, the geometric distribution of each phase medium in the field domain is represented by adopting an image reconstruction method.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic tomography, and relates to a multi-frequency ultrasonic tomography method using attenuation spectrum information fusion, which is used to realize the reconstruction and visual representation of the oil-gas-water three-phase medium distribution in the measured object field. Background technique [0002] Ultrasonic Tomography (UT) is a non-invasive imaging modality in Process Tomography (PT), which records the ipsilateral or The time-varying voltage signal received by the contralateral ultrasonic transducer is combined with the linearized imaging model and the image reconstruction algorithm to reconstruct parameters such as the refractive index, attenuation coefficient or acoustic impedance distribution in the measured field, and then to analyze the distribution of various media in the field. Visual representation. Compared with other imaging methods such as electrical impedance tomography (Elec...

Claims

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Application Information

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IPC IPC(8): G01N29/032G01N29/44
CPCG01N29/032G01N29/44G01N29/4463G01N2291/015G01N2291/024
Inventor 董峰刘皓谭超
Owner TIANJIN UNIV
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