The calibration of magnetometers having electromagnets with the help of cylindrical nickel reference samples
Tracing back the indication of a magnetometer directly to the basic SI units requires considerable effort and complicated equipment which is not always to hand. It is often preferable, therefore, to calibrate the measuring apparatus with the help of reference samples, the relevant magnetic properties of which have been determined by a standards laboratory which is properly equipped for such experiments. In particular it is common to calibrate magnetometers having an iron core electromagnet with the help of cylindrical reference samples. The studies presented here show that the calibration process for these magnetometers has certain problems such as the effects of air gaps, field gradients, magnetic hardness of the reference sample and temperature variations, all of which influence the accuracy of this procedure. These problems were studied on four cylindrical nickel samples which were produced earlier for the European Communities' Bureau of Reference (BCR). In particular, it was found that the magnetic hardness affects the accuracy of the calibration significantly, but proper annealing turns the samples into usable reference standards.
Bibliographic Reference: EUR 14149 EN (1991) 29 pp., MF, ECU 4
Record Number: 199210926 / Last updated on: 1994-12-02
Original language: en
Available languages: en