1、 TECHNICAL REPORT IEC TR 62331 First edition2005-02 Pulsed field magnetometry Reference number IEC/TR 62331:2005(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Publication numbering As from 1 January 1997 all IEC publications are is
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7、for further information.Customer Service Centre If you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.ch Tel:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THI
8、S LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.TECHNICAL REPORT IECTR 62331 First edition2005-02 Pulsed field magnetometry PRICE CODE IEC 2005 Copyright-all rights reserved No part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photoc
9、opying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.ch W For price,see current catalogue Commission
10、Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 TR 62331 IEC:2005(E)CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope and object.7 2 Normative references.7 3 Pulsed fi
11、eld magnetometer(PFM).7 3.1 General principles.8 3.2 Size of test specimen.10 4 Field generator.10 4.1 General.10 4.2 Power supply.10 4.3 Magnetizing solenoid.14 5 Polarization and magnetic field strength sensors(pick-up coils).14 5.1 General.14 5.2 The polarization sensor(J coil).15 5.3 The magneti
12、c field strength sensor(H coil).16 6 Transient instrumentation and digitizing hardware.16 6.1 General.16 6.2 Analogue integration and digitization.17 6.3 Digitization and numerical integration.17 6.4 Digitization rate.17 7 Data processing.17 7.1 Data processing elements.18 7.2 Temperature.23 7.3 Mag
13、netic viscosity.25 7.4 Calibration.25 8 Comparison of measurements.29 8.1 Permeameter,“large magnet“comparison.29 8.2 Extraction method,”small”test specimen comparison.30 8.3 Comparative measurement conclusions.33 9 Conclusion.33 Bibliography.34 Figure 1 M and H time traces for a permanent magnet.9
14、Figure 2 J(H)and B(H)loop for a permanent magnet.9 Figure 3 Sine wave(decaying)electrical configuration.11 Figure 4 Unidirectional pulses(1/2 sine wave)electrical configuration.12 Figure 5 Unidirectional pulses(decaying)electrical configuration.12 Figure 6 Three arrangements of J coil assembly confi
15、gurations (drawing with permission of EMAJ ref.30.15 Figure 7 M and H time traces and(H)plot of a“zero signal”.19 Figure 8 J(H)loops of a sintered NdFeB permanent magnet.23 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.TR 62331 IEC:2
16、005(E)3 Figure 9 J(H)loop including eddy currents of a conductive bulk nickel specimen measurement result from a PFM system.27 Figure 10 Copper specimen eddy current measurement result.27 Figure 11 J(H)loop for eddy current“corrected”nickel specimen.28 Figure 12 Results of a permeameter and a PFM measurement of a“large”specimen.29 Figure 13 Detail of the 1st and 2nd quadrants of the measurement results shown in Figure 12“large magnet”.29 Figure 14 Comparison of a“small magnet”measured in a super