Design and application of magnetoelectric composite heterogeneous field multi-function sensor

Sensor detection probe is an important part of pipeline internal detector. This paper designs a new type of magnetic leakage and eddy current composite sensor which is suitable for nondestructive testing of oil and gas pipelines. The working principle, structure and characteristics of the composite sensor are introduced. The internal and external wall defects can be distinguished and evaluated in combination with the advantages of the leakage flux sensor to the wall volume defect sensitivity and the high frequency eddy current sensor to the surface defect of the pipe wall. Experimental results show that the new type of magnetic leakage and eddy current composite sensor can not only detect defects in the process of pipeline defect detection and can distinguish internal and external wall defect, especially to the surface crack defects may have potential detection.