Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： With the purpose of applying micromagnetic detection technology to nondestructive testing for wire ropes,the finite element method is used for analysis of the feasibility of the broken wire defects detection,using the residual magnetic field of the wire rope itself without extra magnetic field excitation. The wire rope defect points and the leakage magnetic field strength in surrounding air,distribution and the testability have been calculated. Then the influence of the geomagnetic field has been discussed,which is a theoretical basis for micromagnetic detection technology. Moreover, the testing results and the change laws in different broken wires states, as well as the functional relationship between the rope metal sectional area loss and the outputs of the detection system,are obtained through the experimental researches of micromagnetic detection method for wire ropes,that have verified the feasibility and reliability of micromagnetic nondestructive testing technology.
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-04-22
Abstract： The magnetometer based on Giant Magneto-Impedance (GMI) effect becomes one of the hottest points on magnetometer research in recent years. Compared with other magnetometers, GMI magnetometer has the advantages of miniaturization, high sensitivity, quick response, high temperature stability and low power consumption. Based on the sensitive material of Fe-based nano-crystalline ribbon, a GMI probe and subsequent signal processing circuit have been designed and realized to compose a GMI magnetometer. Experimental results suggest that in the magnetic field ranging from-25000nT to 25000nT, the sensitivity is 0.176mV穘T-1, which attains the measurement requirement of a weak magnetic field. The magnetometer has advantages of small size and low power consumption so that could be used in space magnetic field measurement.
Peer Review Status:Awaiting Review
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