A kind of sensor distinguishing pipeline surfaces externally and internally corrosion default

A kind of sensor distinguishing pipeline surfaces externally and internally corrosion default, the input end of filtering and amplifying circuit is connected with the magnetic test coil of detection probe, integrated signal occurs and the signal generation output terminal for the treatment of circuit is connected with the drive coil of detection probe, integrated signal occurs and the signal transacting input end for the treatment of circuit is connected with the output terminal of filtering and amplifying circuit, data storage circuitry occurs with integrated signal and the signal transacting output terminal for the treatment of circuit is connected, filtering and amplifying circuit, integrated signal occurs and treatment circuit and supplying cell group are arranged in shielding box, under the effect of the ac-excited electromagnetic field that oil and gas pipes sends at drive coil, eddy effect can be produced in tube wall, the electromagnetic induction signal that magnetic test coil is received at inner surface of pipeline corrosion default position is different from other position, record and compare the electromagnetic induction signal that pipeline different parts magnetic test coil receives, realize the differentiation of pipeline surfaces externally and internally defect, there is volume little, accuracy of detection advantages of higher.