Reports from Soreq Nuclear Research Center Provide New Insights into Sensor Research (Excess Magnetic Noise in Orthogonal Fluxgates Employing Discontinuous Excitation)
By a News Reporter-Staff News Editor at Journal of Technology -- Investigators discuss new findings in Sensor Research. According to news reporting originating in Yavne, Israel, by VerticalNews journalists, research stated, "The source of the excess magnetic noise caused by discontinuous excitation in a wire core orthogonal fluxgates is described. Discontinuous, or duty cycle, operation allows reducing the inherently high power consumption of orthogonal fluxgates and, therefore, makes possible their employment in mobile equipment."
The news reporters obtained a quote from the research from Soreq Nuclear Research Center, "The magnetization process during an excitation cycle is highly nonlinear and inhomogeneous across the wire core. This is because the ac current component of the excitation electrical current causes a skin effect, which is strongly affected by the nonlinearity of the B-H curve. Thus, the magnetization of the domains across the core takes the shape of a spring onion, where each magnetized shell of domains has different level of magnetization, ranging from deep saturation in outer shells to zero magnetization in the innermost ones. Such a domain structure is not stable, especially at the boundary between remnantly magnetized shell and neutral shells. In the idle excitation intervals, there is an occasion for the domains to relax. The domains relaxation is a stochastic process and therefore incurs excess magnetic noise. We investigate the excess noise by measuring the sensitivity and noise in the excitation cycles using a digital selective bandpass sampling processing technique. The attained equivalent magnetic noise is
According to the news reporters, the research concluded: "A close relationship between the noise model and experimental data is achieved."
For more information on this research see: Excess Magnetic Noise in Orthogonal Fluxgates Employing Discontinuous Excitation. IEEE Sensors Journal, 2014;14(8):52-57. IEEE Sensors Journal can be contacted at: Ieee-Inst Electrical Electronics Engineers Inc, 445 Hoes Lane, Piscataway, NJ 08855-4141, USA. (Institute of Electrical and Electronics Engineers - www.ieee.org/; IEEE Sensors Journal - ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=7361)
Our news correspondents report that additional information may be obtained by contacting E. Weiss, Soreq NRC, Dept. of Appl Phys, IL-81800 Yavne, Israel. Additional authors for this research include R. Alimi, E. Liverts and E. Paperno.
Keywords for this news article include: Yavne, Israel, Asia, Sensor Research
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