Bao, Binghao and Zhou, Yadong and Yang, Ping and Wang, Guoyu (2008) Theoretical and experimental study on novel weak current sensor using single nanocrystalline toroidal core with double-winding. Sensors and Actuators A: Physical, 141 (1). 84 - 88.
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Official URL: http://www.sciencedirect.com/science/article/B6THG...
Fe73.5Cu1Nb3Si13.5B9 nanocrystalline core made by furnace annealing under nitrogen atmosphere can show good thermal stability of magnetic properties and excellent soft magnetic properties. Based on the characteristic of the sensitive magnetic core, we proposed a novel non-contact weak current sensor adopting single nanocrystalline core with double-winding excited by a multivibrator bridge. The measurement principle based on an established mathematic model for the sensor was described in details. The observed phenomenon is consistent with the theoretical results and the model, indicating that the key factors affecting the performance of the sensor includes the magnetic parameters of the sensing materials, the number of turns of the coils and circuit parameters in the multivibrator bridge. In other words, we can design sensor freely to meet different requirements according to its theory. The output signal of the multivibrator bridge was analyzed by Fourier transform. Moreover, the method to design the corresponding signal conditioning circuit was presented. The zero drift of the sensor was maintained within 0.01%FS at 25 °C for 2 h, and the temperature offset drift for zero input current was less than 0.03%FS/°C for temperature variation from −15 °C to 50 °C.
|Uncontrolled Keywords:||Single nanocrystalline core with double-winding; Non-contact; Weak current sensor; Fourier transform; Multivibrator bridge|
|Subjects:||Analytical Science > Nanotechnology for sensing and actuating|
Material Science > Nanostructured materials
|Deposited On:||10 Apr 2009 05:15|
|Last Modified:||10 Apr 2009 05:15|
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