Patent ID: 8729886

Claim:
A device for measuring alternating current magnetic susceptibility, comprising: an alternating current magnetic susceptibility coil set, including: an exciting coil coupled to an external function generator for generating an alternating current magnetic field based on variation of alternating current electrical signals form the function generator; and a pickup coil for picking up an alternating current magnetic susceptibility signal of an under testing particle generated by inducting the variation of the alternating current magnetic field of the exciting coil; and a voltage dividing cancellation circuit coupled to the pickup coil of the alternating current magnetic susceptibility coil set; a signal capturing unit for capturing the alternating current magnetic susceptibility signal picked up by the pickup coil; and a signal processing unit for processing the alternating current magnetic susceptibility signal from the signal capturing unit and extracting the alternating current magnetic susceptibility intensity variation and phase difference and/or the real part and the imaginary part of the alternating current magnetic susceptibility.