Multilayer PCB differential eddy current detection sensor

Abstract

The invention discloses a multilayer PCB differential eddy current detection sensor, which comprises an excitation coil and a receiving coil, the central axes of the excitation coil and the receivingcoil are the same, the excitation coil adopts a single-layer PCB rectangular coil with a differential structure, and the receiving coil is a multilayer PCB rectangular coil; when alternating current is introduced into the exciting coil, eddy current is excited on a tested piece, the excited eddy current generates a secondary magnetic field and then is received by the receiving coil, and when a defect occurs in the tested piece, the flow direction of the eddy current on the tested piece is changed, so that the voltage amplitude or phase of the receiving coil is changed, and the related defect information of the tested piece is detected.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and more specifically relates to a multilayer PCB differential eddy current testing sensor. Background technique [0002] Pipeline transportation is considered to be one of the safest and most economical transportation methods. However, as with all engineering equipment, there are safety issues, so in the use of pipelines, crack defects often appear over time. In the past few decades, there have been countless accidents caused by pipeline failures around the world. In the aging process of old pipelines, there is a possibility of danger. In order to solve this problem, countries around the world have invested a lot of manpower and financial resources to detect and repair existing pipelines The problem is increasing year by year, and new pipelines still face huge risks. [0003] At present, in-pipeline detection methods are widely used in pipeline integrity evaluation, and become a...

AI Technical Summary

Problems solved by technology

However, the detection effect of magnetic flux leakage detection on non-ferromagnetic pipelines is not good, the weight of the instrument is relatively large, and the detection efficiency is relatively low; the detection effect of alternating electromagnetic field detection technology on the lift-off effect is not good, and the yoke is not easy to place in the pipeline; Ultrasonic testing requires couplant, the detection speed is extremely slow, the detection time is long, and there is a certain near-field blind area, which is easy to cause missed detection

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