Results 221 to 230 of about 52,959 (254)

Noise calculation and analysis of a search coil magnetometer

2010 International Conference on Computer Application and System Modeling (ICCASM 2010), 2010
For expertise on detecting very weak signal, search coil magnetometer is widely used in Magnetotellurics (MT). Unfortunately, noise is a primary factor affecting the sensitivity. In this work, noise model of the magnetometer is presented based on measured parameters, where transfer function affected by core eddy current loss is considered.
null Zhao Yifei, null Guo Shuxu, null Zhang Shuang, null Chen Shudong, null Lin Jun   +4 more
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Monte-Carlo Search for Snakes and Coils

2012
The “Snake-In-The-Box” problem is a hard combinatorial search problem, first described more than 50 years ago, which consists in finding longest induced paths in hypercube graphs. Solutions to the problem have diverse and some quite surprising practical applications, but optimal solutions are known only for problems of small dimension, as the search ...
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The Use of Search Coils for Magnetic Measurements

International Journal of Electrical Engineering & Education, 1982
The basic principle of search coils is explained by reference to the integral form of Maxwell's equation. The salient features of instrumentation, necessary for search coil applications, are discussed, followed by a brief description of a few typical examples of magnetic measurements by a variety of search coils.
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Research of Core Characteristics of Search Coil Magnetometer

Advanced Materials Research, 2012
In this paper, the theory of apparent permeability and effective permeability of the core is described. The apparent permeability with coil in different positions of the core is investigated and simulated by HFSS. The best location of the coil is determined according to the curves of the apparent permeability.
Qun Yu, Hou Bo Zhang, Guan Nan Lin
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Search-coil head-thrust and caloric tests in Ménière's disease

Acta Oto-Laryngologica, 2005
Our findings suggest that canal function is substantially preserved in subjects with active vertigo attacks as a result of Ménière's disease (MD). In these subjects, the head-thrust test (HTT) may not be as sensitive to canal dysfunction as traditional caloric testing.
Hong Ju, Park, Americo A, Migliaccio, Charley C, Della Santina, Lloyd B, Minor, John P, Carey   +4 more
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Improving the homogeneity of the magnetic field in the magnetic search coil technique

IEEE Transactions on Biomedical Engineering, 2001
The magnetic search coil technique is used to obtain accurate eye-movement measurements. For the data analysis it must be assumed that the magnetic field does not change over time (apart from the required modulation). To comply with this assumption either no translational movements of the eye coil(s) are allowed or the magnetic field has to be ...
Jochen Ditterich, Thomas Eggert
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Reconsideration of Bell's phenomenon using a magnetic search coil method

Documenta Ophthalmologica, 1992
The exact direction, amplitude and time course of Bell's phenomenon is still controversial. We evaluated the eye movements associated with spontaneous blinks, voluntary blinks and prolonged eyelid closure using a magnetic search coil method. Spontaneous blinks were accompanied by transient downward and nasalward eye movements, and similar movement ...
M, Takagi, H, Abe, S, Hasegawa, T, Usui
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Nystagmus of Pelizaeus-Merzbacher Disease A Magnetic Search-Coil Study

Archives of Neurology, 1991
Magnetic search-coil oculography of three brothers with clinically diagnosed Pelizaeus-Merzbacher disease disclosed the presence of binocular elliptical pendular nystagmus in two patients in whom the waveform of the nystagmus was not obvious on inspection. This study, the first reported application of high-resolution oculography to Pelizaeus-Merzbacher
J D, Trobe, J A, Sharpe, D K, Hirsh, S S, Gebarski   +3 more
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Applying wire antenna theory to cored search coils

Radio Science, 1998
It seems conceivable that the magnetic field pattern around ferromagnetic objects of high permeability is similar to the electric field pattern around conductive objects, provided that the shapes of the magnetic and electric objects are identical. As a result, we expect the mmf behavior in the gap between two ferromagnetic limbs immersed in a magnetic ...
B. Z. Kaplan, U. Suissa
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A note on search coil errors in the measurement of axial magnetic fields

Journal of Scientific Instruments, 1962
An expression is derived for magnetic fields with axial symmetry relating the actual value of the flux density at a point on the axis to the flux density measured by a search coil. It is shown that the error due to the search coil depends upon the even order derivatives of the actual flux distribution, and in some cases may be eliminated by careful ...
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