K. Weyand

Physikalisch-Technische Bundesanstalt

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G.-D. Willenberg

Physikalisch-Technische Bundesanstalt

Rainer Ketzler

Physikalisch-Technische Bundesanstalt

Manfred Kitschke

Physikalisch-Technische Bundesanstalt

Joachim Lüdke

Physikalisch-Technische Bundesanstalt

J. Kupec

Český Metrologický Institut

H. Ahlers

Physikalisch-Technische Bundesanstalt

V. Ya. Shifrin

D.I. Mendeleyev All-Russian Institute for Metrology

J H Belliss

Middlesex University

Stephen H. Bryant

University of Cincinnati

Gerd‐Dietmar Willenberg

Physikalisch-Technische Bundesanstalt

Cooperative Institutions

Physikalisch-Technische Bundesanstalt

Polish Botanical Society

Technische Universität Braunschweig

All-Russian research Institute of metrological service

National Physical Laboratory

Český Metrologický Institut

B. Braun (Germany)

Technion – Israel Institute of Technology

D.I. Mendeleyev All-Russian Institute for Metrology

All-Russian Scientific Research Institute of Butter and Cheese Making

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Three-dimensional positioning setup for magnetometer sensors

IEEE Transactions on Instrumentation and Measurement (1997)

G.-D. Willenberg K. Weyand

As the sensors of many magnetometers, such as SQUID magnetometers, are not directly accessible, their spatial location is often known only approximately. To be able to position such sensors more accurately, a novel measuring setup has been developed to determine the sensor location by means of magnetic measurements. The system has a resolution of better than 0.1 mm. It can be used with virtually any magnetometer that is capable of working in inhomogeneous fields. Measurements with SQUIDs inside two different commercial Dewars yielded out-of-axis sensor displacements of 1.6 mm and 7.5 mm, which show clearly that the performing of such measurements is essential in experiments where the exact sensor location could be crucial.

Position (finance)

Biomagnetism

Position sensor

10.1109/19.571939

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Citations (1)

First results of the γ<sub>p</sub> experiment at the PTB

IEEE Transactions on Instrumentation and Measurement (1985)

K. Weyand

A γ _p,low experiment based on a novel method of determining the coil constant has yielded preliminary results. The coil constant is found by measuring the flux profile along the axis of the windings. When the NMR experiment is performed in the free precession mode, the value of γ _p amounts to γ _p = 2.675 143 × 10 ₈ (/spl I.chemo/ 3.4 × 10 _-6 ) T _-1PTB · s _-1 with a (1 σ) uncertainty.

10.1109/tim.1985.4315293

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Citations (9)

Maintenance and dissemination of the magnetic field unit at PTB

IEEE Transactions on Instrumentation and Measurement (2001)

K. Weyand

The different methods which are used at PTB to disseminate the unit of flux density are presented and compared with respect to their uncertainties. A DC flux density range from 10 /spl mu/T to 2 T is covered with the lowest relative uncertainty of 10/sup -6/ at fields of 1 mT to 2 mT. In case of AC fields, field coils are used as standards, the frequency response of which is checked by means of a simple but very reliable inductive measuring technique. A relative uncertainty of 3/spl middot/10/sup -3/ or even less is typically achieved for frequencies below 30 kHz.

10.1109/19.918168

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Citations (20)

Locating Magnetic Sensor Elements Inside Their Casing

IEEE Transactions on Instrumentation and Measurement (2007)

K. Weyand Joachim Lüdke Manfred Kitschke

A setup has been developed for determining the axial position of the active magnetic sensor element inside its case with respect to a reference face at the outside of the sensor case. For an axial Hall-sensor providing a sensitivity of 1 mV/muT, an uncertainty in the order of 6 mum is achieved, i.e., the uncertainty of the distance between reference point and Hall element, as specified by the producer, can be reduced by a factor of about 50. For a fluxgate sensor having two rods of 5 mm in length, it is possible to localize its axial magnetic center within nearly the same uncertainty

Fluxgate compass

Rod

Position (finance)

Hall effect sensor

10.1109/tim.2007.890786

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Compensation of the Temperature Coefficient of Magnetic Field Coils

IEEE Transactions on Instrumentation and Measurement (2005)

K. Weyand

A simple, but very effective, method has been developed for compensating the temperature coefficient of the coil constant of any magnetic dc field coil to an almost negligible order. The method is useful for precise single-layer standard coils as well as for multilayer high-field coils. The effect of the coil constant temperature coefficient has been successfully reduced up to two orders.

Constant (computer programming)

Temperature coefficient

10.1109/tim.2004.843076

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Citations (4)

Final Report of CCEM Key Comparison CCEM.M-K1: Magnetic flux density by means of transfer standard coil

Metrologia (2005)

K. Weyand

The delegates of the CCEM discussion meeting on international comparisons in magnetism recommended in May 2000 in Sydney that a worldwide intercomparison of magnetic flux density by means of a transfer standard coil should be proposed in addition to and in accordance with the EUROMET project No?446. A field coil of the Garret type was prepared and provided as transfer standard by PTB acting again as pilot laboratory. The single layer coil produces a field with a flux density of about 2?mT if it carries the maximum permitted current of 1?A. This standard was circulated in 2001 and 2002 to nine other national metrology institutes worldwide. The standard coil has also be used to compare the ac field calibration set-ups of the various laboratories. In order to provide a frequency response different to that of the standard used for the EUROMET comparison, the current distribution network at both flanges of the standard coil had been modified with the result that the frequency dependence of the coil constant shows a minimum at f?=?4?kHz. Each participant was asked to apply the measuring methods and to use the equipment as available for his daily work to tranfer the unit of magnetic dc and ac flux density. So, quite different methods have been applied within the intercomparison. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the Mutual Recognition Arrangement (MRA).

10.1088/0026-1394/42/1a/01006

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Citations (2)

The Proposed Ampere Experiment at the PTB

IEEE Transactions on Instrumentation and Measurement (1985)

K. Weyand Gerd‐Dietmar Willenberg

The ampere may be realized by combining the results of two different NMR experiments. In contrast to the well-known methods, we describe here a novel approach whereby the first-order influence of the geometrical dimensions of the coils is eliminated by using one coil for weighing and for producing a magnetic flux density to which that of the low-field experiment is related.

Ampere

Biomagnetism

10.1109/tim.1985.4315299

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Citations (1)

Error Analysis of Energy Absorption based NMR-Magnetometer

Conference on Precision Electromagnetic Measurements (2004)

K. Weyand Joachim Lüdke H. Ahlers

The uncertainty of magnetic fields measurement by means of NMR magnetometer has proved to be considerably larger than expected from the magnetometer specifications. Possible error sources have been analysed using a PC-aided marginal oscillator providing a resolution of less than 0.1 muT

Error Analysis

10.1109/cpem.2004.305274

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Citations (1)

Intercomparison of magnetic flux density by means of field coil transfer standard

K. Weyand

The coil constant k/sub 0/-i.e. the quotient of magnetic flux density in the coil centre over the coil current-of a Garrett type field coil has been determined in units as maintained by various standard laboratories. Most of the laboratories have also measured the coil constant k(f) as function of frequency up to f=15 kHz.

Search coil

Constant (computer programming)

10.1109/cpem.2000.850968

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Citations (2)

Realization of the Ampere Based on High- and Low-Field NMR Experiments

Metrologia (1986)

K. Weyand G.-D. Willenberg

The SI unit of current, the ampere, may be realized by combining the results of two different NMR experiments observing the precession frequencies of some nuclei. In contrast to the well-known methods used in some metrology institutes we suggest referring the magnetic flux densities produced by quite different coil arrangements in the two experiments to one coil, thus eliminating the first-order influence of its geometrical dimensions.

Ampere

Realization (probability)

Precession

10.1088/0026-1394/22/3/017

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Citations (3)