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

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...

AI Technical Summary

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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