Differential eddy current resonance detection sensor and system

Abstract

The invention discloses a differential eddy-current resonance detection sensor and system, and belongs to the technical field of nondestructive testing, the differential eddy-current resonance detection sensor comprises an excitation coil and a receiving coil which are coupled, the receiving coil is connected with a first resonant capacitor in parallel, and the excitation coil is connected with a second resonant capacitor in parallel, so that an excitation loop and a detection loop reach a resonant state respectively; and the mutual inductance of the exciting coil and the receiving coil is enhanced, and the coil voltage when the defect is detected is enhanced, so that the related defect information of the tested piece is detected, and the defect detection capability is improved. Furthermore, the excitation coil and the receiving coil are connected with a resonant capacitor in parallel, so that the coupling relation between the excitation coil and the detection coil is changed, mutual inductance between the coils is increased, the optimal excitation frequency is reduced, the skin depth of eddy current is increased, and the detection capacity for deep defects is improved.

Description

technical field [0001] The invention relates to the technical field of nondestructive testing, in particular to a differential eddy current resonance detection sensor and system. Background technique [0002] Pipeline transportation is considered to be one of the safest and most economical transportation methods. However, like all engineering equipment, there will be safety problems. In the use of pipelines, crack defects often appear over time. In the past few decades, a large number of safety accidents have been caused by pipeline failures around the world. In order to avoid this problem, countries around the world have invested a lot of human and financial resources in real-time detection of pipeline operation status to find pipeline defects in time. At present, in-pipeline detection methods are widely used in pipeline integrity evaluation, and become an important pre-control method to ensure the safe transportation of oil and gas pipelines, which is of great significanc...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the existing eddy current detection cannot effectively separate the defect information from the detection signal, and the defect detection performance needs to be improved, and provide a differential eddy current resonance detection sensor and system

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