Investigations on the Equivalent Magnetic Noise of Magneto(Elasto)Electric Sensors by Using Modulation Techniques

Abstract:

The equivalent magnetic noise of the magnetoelectric (ME) layered composite sensors has been investigated for various modulation techniques. The ME thin film response to an electric modulation or a magnetic modulation can be sensed by using either a charge amplifier or a coil wound around the sample and then demodulated by a synchronous detector. The equivalent magnetic noise for these excitations methods has been compared. As expected, the low-frequency fluctuations can be lowered when the magnetoelectric sensor is operated in a modulation mode. Results show that these methods can give the same level of equivalent magnetic noise for a certain strain-excitation. In theory, mechanical noise appears as the only dominant noise source after the demodulation process in the case of a certain strong amplitude excitation carrier signal. By using these modulation techniques, an equivalent magnetic noise level of 10-100 pT/Hz at 1 Hz was achieved with DC capability.

• Periodical: Key Engineering Materials (Volume 605)
• Pages: 344-347
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.605.344
• Online since: April 2014
• Authors: Xin Zhuang*, Marc Lam Chok Sing, Christophe Dolabdjian, Peter Finkel, Jie Fang Li, Dwight Viehland
• Keywords: Magnetic Noise, ME, Modulation, Non-Linearity

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DOI: 10.1109/JSEN.2013.2274098