نتایج جستجو برای: magnetic noise
تعداد نتایج: 525301 فیلتر نتایج به سال:
A directional local magnetic measurement technique as example of measuring the angular dependence Barkhausen noise in electrical and construction steels at typical quasi-static frequency by needle probe (MNP) method is presented. The configuration MNP a half-turn search coil sensor coupled to high gain analogue amplification order filtration stages, owing its very weak induced electromotive for...
Magnetic noise in electrical machines and transformers are a large portion of the total noise of the device. Part of this magnetic noise is caused by the deformation of the ferromagnetic laminations due to the magnetic field. This effect is called magnetostriction, and it strongly depends on the applied magnetic field, the material properties and external pressure to the material. A strain gaug...
We present a preliminary experimental study of electrical conductivity imaging using an 11T Magnetic Resonance Electrical Impedance Tomography (MREIT) system. The primary goal was to evaluate the noise level in measured magnetic flux density data subject to an injection current. We found that the noise level from the 11T system is about 0.2nT whereas it is about 1.4nT using a 3T system. MREIT c...
Alternating dc bias enables eliminating offset in orthogonal fluxgates operated in fundamental mode. However, the alternating dc bias reversals increase the fluxgate magnetic noise. It is shown in this work that the excess magnetic noise is related to the dynamics of the magnetic domains in the fluxgate core. The alternating dc bias reverses the fluxgate core magnetization causing nucleating do...
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