Device for measuring AC magnetization of materials
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United States of America Patent
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Jun 5, 2012
Grant Date -
Jun 25, 2009
app pub date -
Feb 27, 2009
filing date -
Nov 16, 2005
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Abstract
Disclosed is an apparatus for measuring ac magnetization at mixture frequency. The apparatus includes an ac generating unit for generating at least a first current with a frequency f1 and a second current with a frequency f2. The apparatus further includes a co-axial solenoid unit, driven by the first and second ac currents, to generate a first magnetic field and a second magnetic field. A pick-up solenoid is for disposing sample for detecting an ac magnetization of the sample and multiple frequency-component signals corresponding to various frequency combinations of f1 and f2 are output. The apparatus further includes a signal processing circuit for receiving the frequency-component signals, where the signal processing circuit obtains the ac magnetization of the sample at a target frequency of (γTf1+βTf2), which γT and βT are positive integers and the frequency f1 and the frequency f2 are two different frequencies.
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