A pulsed field magnetometer for the quality control of permanent magnets

被引:16
作者
Dudding, J
Knell, PA
Cornelius, RN
Enzberg-Mahlke, B
Fernengel, W
Grössinger, R
Küpferling, M
Lethuillier, P
Reyne, G
Taraba, M
Toussaint, JC
Wimmer, A
Edwards, D
机构
[1] Hirst Magnet Instruments Ltd, Falmouth TR11 4SN, Cornwall, England
[2] Magnetfab Schramberg, Schramberg Sulgen, Germany
[3] VAC, Hanau, Germany
[4] Tech Univ Vienna, Inst Expt Phys, Vienna, Austria
[5] CNRS, Grenoble, France
[6] Univ Grenoble 1, ENSIEG, LEG, F-38402 St Martin Dheres, France
[7] Mecelec Developments Ltd, Gloucester, England
关键词
magnetic measurement; hysteresis loop; eddy currents;
D O I
10.1016/S0304-8853(01)01247-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A pulsed field magnetometer (PFM) for industrial applications was developed. The system has it capacitor bank of 5 mF for energy storage, which can be charged up to 3000 V. The pulse magnet has it bore of 30 mm (including the pickup coil), which is subdivided into two coils and produces a maximum field of 5T with pulse frequencies of 17.5 and 25 Hz. The magnetisation is measured with a well balanced and temperature stabilised coaxial pickup system. The signal is integrated with a stable analogue integrator with selectable time constants. The signals are connected to a 14bit 5M sample/s two-channel ADC in a computer. For the data handling it C++-based computer program was written. The effects of eddy currents on the metallic samples are corrected by using the so-called f/2f method. Here two hysteresis measurements with two different time constants are used to measure the eddy current error. The function and reliability of the system is demonstrated by measuring the hysteresis of standard permanent magnets in the PFM and in a static system. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1402 / 1404
页数:3
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