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Andras Csontos; Balazs Heilig; Laszlo Hegymegi; Alan Berarducci
International Association of Geomagnetism and Aeronomy IAGA 11. Scientific Assembly2009
International Association of Geomagnetism and Aeronomy IAGA 11. Scientific Assembly2009
AbstractAbstract
[en] Complete text of publication follows. Since the beginning of this decade fast DIDD magnetometers have been also applied to record the geomagnetic variation as an 'INTERMAGNET standard' instrument. The principle of this instrument makes it clear, that the values recorded by DIDD are void from offset and scalar factor errors. For the description of the reference frame only four parameters are needed: The angle between the two magnetic axes of the coil system (εID) and the three orientation angles (I0, D0 and ε0). Two methods were developed in the past to find and monitor the coordinate system of the DIDD by using independent geomagnetic measurements. The first method uses absolute measurements to calibrate the DIDD (Schott and Pankratz 2001) while the other is the inter-calibration process developed in Tihany Geophysical Observatory (Heilig 2007). The second method is based on simultaneous recordings of a DIDD and a tri-axial fluxgate magnetometer. A simple new procedure is applied in order to measure εID value directly from DIDD recordings themselves. The sensitivity of this calculation is at the order of arc seconds at the geomagnetic latitude of Tihany Geophysical Observatory. The advantage of this method is double. First, we will be able to adjust the orthogonality accurately, and on the other hand we can monitor the value of this angle periodically. The cognition of this angle is an important station in the development of DIDD instrument, because it gives the possibility for self-calibration of the orthogonality. After the orthoganality error is eliminated only the three orientation angles including the levelling of the D axis (ε0) left to be determined. This can be done using absolute measurements. The poster will describe the new methods and present the first test results to demonstrate the accuracy and the limitation of the new observatory practices.
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Geodetic and Geophysical Research Institute of the Hungarian Academy of Sciences (ed.); [1212 p.]; 2009; [1 p.]; International Association of Geomagnetism and Aeronomy IAGA 11. Scientific Assembly; Sopron (Hungary); 23-30 Aug 2009; Available from http://www.iaga2009sopron.hu
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Bulsara, Adi R.; Lindner, John F.; In, Visarath; Kho, Andy; Baglio, Salvatore; Sacco, Vincenzo; Ando, Bruno; Longhini, Patrick; Palacios, Antonio; Rappel, Wouter-Jan, E-mail: bulsara@spawar.navy.mil2006
AbstractAbstract
[en] Recently, we have shown the emergence of oscillations in overdamped undriven nonlinear dynamic systems subject to carefully crafted coupling schemes and operating conditions. Here, we summarize experimental results obtained on a system of N=3 coupled ferromagnetic cores, the underpinning of a 'coupled-core fluxgate magnetometer' (CCFM); the oscillatory behaviour is triggered when the coupling constant exceeds a threshold value (bifurcation point), and the oscillation frequency exhibits a characteristic scaling behaviour with the 'separation' of the coupling constant from its threshold value, as well as with an external target DC magnetic flux signal. The oscillations, which can be induced at frequencies ranging from a few Hz to high-kHz, afford a new detection scheme for weak target magnetic signals. We also present the first (numerical) results on the effects of a (Gaussian, exponentially correlated) noise floor on the spectral properties of the system response
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S0375-9601(05)01809-8; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Chen, D.-X.; Pardo, E.; Sanchez, A., E-mail: chen@maxwell.uab.es2006
AbstractAbstract
[en] Fluxmetric and magnetometric demagnetizing factors, Nf and Nm, for cylinders along the axial direction are numerically calculated as functions of material susceptibility χ and the ratio γ of length to diameter. The results have an accuracy better than 0.1% with respect to min(Nf,m,1-Nf,m) and are tabulated in the range of 0.01=<γ=<500 and -1=<χ<∼. Nm along the radial direction is evaluated with a lower accuracy from Nm along the axis and tabulated in the range of 0.01=<γ=<1 and -1=<χ<∼. Some previous results are discussed and several applications are explained based on the new results
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S0304-8853(06)00580-4; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Viktor Wesztergom; Andras Koppan
International Association of Geomagnetism and Aeronomy IAGA 11. Scientific Assembly2009
International Association of Geomagnetism and Aeronomy IAGA 11. Scientific Assembly2009
AbstractAbstract
[en] Complete text of publication follows. Five sets of variometers are continuously operated at the NCK observatory for different purposes. Three sets of fluxgate, one set of torsion magnetometer and one semi-absolute vector magnetometer had been tested for scale value, sensor orientation, temperature effects and long term stability by using natural variations. Differences between measured and calculated total field, as well as baseline variations were considered and different transfer functions among components were analyzed to achieve higher accuracy.
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Geodetic and Geophysical Research Institute of the Hungarian Academy of Sciences (ed.); [1212 p.]; 2009; [1 p.]; International Association of Geomagnetism and Aeronomy IAGA 11. Scientific Assembly; Sopron (Hungary); 23-30 Aug 2009; Available from http://www.iaga2009sopron.hu
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William Worthington, E.; Tim White; Sauter, E.A.; Stewart, D.C.
International Association of Geomagnetism and Aeronomy IAGA 11. Scientific Assembly2009
International Association of Geomagnetism and Aeronomy IAGA 11. Scientific Assembly2009
AbstractAbstract
[en] Complete text of publication follows. The U. S. Geological Survey Geomagnetism Program is now collecting one-second triaxial fluxgate magnetometer data at its observatories. Extensive testing is being done to validate the data and document its resolution and timing accuracy. Magnetometer resolution is evaluated by examining the second-to-second differences of each individual component to estimate the noise level. The noise level is determined for the data acquisition system itself and then at each observatory site. Timing accuracy is tested by using the one pulse per second (PPS) output from a GPS clock to trigger a pulse generator with delay. Through this test we are able to quantify the delay introduced by each component of our data acquisition system, including the fluxgate magnetometer and A/D converter. As a second test of timing accuracy, a sine wave is used to examine the delay in the analog output from the fluxgate. The results of these tests are compared with the standards of 0.01 nT resolution and 10 millisecond time accuracy as proposed by Intermagnet in 2008.
Primary Subject
Source
Geodetic and Geophysical Research Institute of the Hungarian Academy of Sciences (ed.); [1212 p.]; 2009; [1 p.]; International Association of Geomagnetism and Aeronomy IAGA 11. Scientific Assembly; Sopron (Hungary); 23-30 Aug 2009; Available from http://www.iaga2009sopron.hu
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AbstractAbstract
[en] We report the design, fabrication, and characterization of a new system that combines the performances of two different types of magnetic characterization systems, Alternating Gradient Force Magnetometers (AGFM) and susceptometers. The flexibility of our system is demonstrated by its capability to be used as any of them, AGFM or susceptometer, without any modification in the experimental set-up because of the electronics we have developed. Our system has a limit of sensitivity lower than 5 × 10−7 emu. Moreover, its main advantage is demonstrated by the possibility of measuring small quantities of materials under DC or AC magnetic fields that cannot properly be measured with a commercial vibrating sample magnetometers or AGFM
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(c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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Ripka, Pavel, E-mail: ripka@feld.cvut.cz2000
AbstractAbstract
[en] Although fluxgates may have a resolution of 50 pT and an absolute precision of 1 nT, their accuracy is often degraded by crossfield response, non-linearities, hysteresis and perming effects. The trends are miniaturization, lower power consumption and production cost, non-linear tuning and digital processing. New core shapes and signal-processing methods have been suggested
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S0304885300002730; Copyright (c) 2000 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Journal of Magnetism and Magnetic Materials; ISSN 0304-8853;
; CODEN JMMMDC; v. 215-216(3); p. 735-739

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Kubota, Yusuke; Obayashi, Haruo; Miyahara, Akira; Ohno, Kazuko; Nakamura, Kouichi; Horii, Kenzi.
National Inst. for Fusion Science, Nagoya (Japan)1991
National Inst. for Fusion Science, Nagoya (Japan)1991
AbstractAbstract
[en] A computer-driven, three-dimensional magnetic fluxmeter to be used also for magnetic field dosimetry has been developed. A magnetic monitor applicable to this object should be measurable to an absolute value of local magnetic field strength and also be able to record its time integration as a measure of exposed dose to the magnetic field. The present fluxmeter consists of signal amplifiers, rectifiers, an A/D converter, and a pocket computer (PC). The signal outputs from the sensors are processed with the PC to compose an absolute strength of magnetic flux density and its time-integrated value. The whole system is driven by a battery and is quite compact in size to be used as a handy portable system. Further details of the design, idea, construction, specification, and testing result of the fluxmeter are described. The measurable range are from 0.4G to 20,000G in normal mode and 8mG to 400G in high-sensitivity AC mode, and the sensitivity is well independent of the magnetic field direction. These measured data are displayed in real time on the LCD panel of the PC and memorized in RAM files. Possible application of the fluxmeter are discussed with special attention to the search of the leakage and/or disturbing error fields around LHD (large Helical Device) and other magnetic systems, the individual dose control to the workers in strong magnetic fields, and the evaluation of the effects of long irradiation of magnetic fields. (author)
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Jul 1991; 48 p
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Baranov, P; Baranova, V.; Kolomeytsev, A; Zatonov, I, E-mail: bpf@tpu.ru2018
AbstractAbstract
[en] One of the obvious applications of magnetometers is a system of magnetic vacuum which is able to minimize the influence of external magnetic fields on the operation of electronic instrumentation. In magnetic field systems, fluxgate magnetometers are commonly used in the capacity of absolute magnetic field sensors. However, the quality improvement of magnetic vacuum requires the improvement of the fluxgate performance, in particular, its sensitivity. (paper)
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IMEKO 2018: 22. World Congress of the International Measurement Confederation; Belfast (United Kingdom); 3-6 Sep 2018; Available from http://dx.doi.org/10.1088/1742-6596/1065/5/052020; Country of input: International Atomic Energy Agency (IAEA)
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Journal of Physics. Conference Series (Online); ISSN 1742-6596;
; v. 1065(5); [4 p.]

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Rivkin, L.; Vollenweider, Ch.; Zichy, J.A.; Korchuganov, V.N.; Mikhailov, S.F.; Churkin, I.N.; Steshov, A.G.; Semenov, E.P.; Ogurtsov, A.B.; Golubenko, O.B.; Antohin, E.I.; Demenev, V.V.
17. Conference on the charged particle accelerators. Collection of reports in two volumes. Vol. 12000
17. Conference on the charged particle accelerators. Collection of reports in two volumes. Vol. 12000
AbstractAbstract
[en] The multipoles for SLS Storage Ring having very hard requirements to the manufacture and the alignment of the multipoles relative to the ideal axes were manufactures and magnetic measured by the Budker Institute of Nuclear Physics. The Rotating Coil Systems (RCS) for the precise magnetic measurements are described in the paper. The main RCS parameters are discussed. Such precision magnetic measurement system as RCS permits obtaining the harmonic coefficients, axis position and roll angle with high accuracy
[ru]
Мультиполи для накопительного кольца СЛС предъявляют очень жесткие требования к их изготовлению и к их юстировке относительно идеальных осей. Их изготовление и магнитные измерения осуществлялись в Институте ядерной физики им. Будкера. Описываются измерительные системы с вращающейся катушкой (СВК), обеспечивающие высокую точность магнитных измерений. Обсуждаются основные параметры СВК. Показано, что такие СВК позволяют получить высокую точность измерения гармонических коэффициентов магнитного поля, положения оси и угла вращения магнитной осиPrimary Subject
Source
Rossijskaya Akademiya Nauk, Moscow (Russian Federation); Ministerstvo Promyshlennosti, Nauki i Tekhnologij RF, Moscow (Russian Federation); Ministerstvo RF po Atomnoj Ehnergii, Moscow (Russian Federation); Ob''edinennyj Inst. Yadernykh Issledovanij, Dubna (Russian Federation); Gosudarstvennyj Nauchnyj Tsentr RF Inst. Fiziki Vysokikh Ehnergij, Protvino, Moskovskaya Oblast' (Russian Federation); 447 p; ISBN 5-88738-035-7;
; ISBN 5-88738-034-9;
; 2000; p. 29-33; 17. Conference on the charged particle accelerators; 17. Soveshchanie po uskoritelyam zaryazhennykh chastits; Protvino (Russian Federation); 17-20 Oct 2000; 4 refs., 3 tabs.


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