Low-frequency magnetic field detection for metal sensing

2007 ◽  
Vol 25 (1-4) ◽  
pp. 447-451 ◽  
Author(s):  
Toshihiko Kiwa ◽  
Tomoaki Kawata ◽  
Keiji Tsukada
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Field Detection ◽  
Frequency Magnetic Field ◽  
Metal Sensing

Low-Frequency Nanotesla Resolution of Magnetic Field Detection in Metglas/Magnetostrictive/Piezoelectric Laminates

2014 ◽  
Vol 960-961 ◽  
pp. 695-699 ◽  
Author(s):  
Jia Gui Tao ◽  
Yong Yong Jia ◽  
Hao Wu ◽  
Jing Gang Yang
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Resonant Mode ◽  
Piezoelectric Composite ◽  
Field Detection ◽  
Maximum Resolution ◽  
Three Phase ◽  
Cantilever Structure ◽  
Frequency Magnetic Field ◽  
Tip Mass

We report nanotesla resolution in a three-phase Metglas/FeNi/PZT-5A multiferroic composite with one end rigidly clamped operating in the first-order bending resonant mode for low-frequency magnetic field detection. Strong bending magnetoelectric (ME) couplings induced by the ununiform strain distribution in the free-clamped magnetostrictive beam are achieved without the benefit of nonmagnetic tip mass, and its natural resonant frequency is much lower than that in operating free-free mode. In addition, high-permeability materials Metgals are attached on the magnetostrictive beam for magnetic flux concentrating and resolution improvement. Experimental results reveal that the three-phase ferromagnetic/magnetostrictive/piezoelectric composite with a cantilever beam structure exhibits a high bending ME coefficient of ~32.17 V/cm·Oe at the resonant bending frequency of 819Hz under Hdc=175Oe. At the resonant excitation, the maximum resolution of 7nT is acquired under Hac=1Oe. The proposed ME cantilever structure with high resolution provideds a promising application in low-frequency magnetic transducer and sensors.

Change in the absorption spectra of blood exposed to a low-frequency magnetic field

2007 ◽  
Vol 74 (2) ◽  
pp. 223-229 ◽  
Author(s):  
G. A. Zalesskaya ◽  
N. P. Mit’kovskaya ◽  
O. A. Galai ◽  
A. V. Kuchinskii ◽  
O. V. Laskina
Keyword(s):  
Magnetic Field ◽  
Absorption Spectra ◽  
Low Frequency ◽  
Frequency Magnetic Field

Effect of low-frequency magnetic field on formation of pigments of Monascus purpureus

2014 ◽  
Vol 240 (3) ◽  
pp. 577-582 ◽  
Author(s):  
Jialan Zhang ◽  
Dongjie Zeng ◽  
Cui Xu ◽  
Mengxiang Gao
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Monascus Purpureus ◽  
Frequency Magnetic Field
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