论文信息 - Magnetometer calibration setup controlled by nuclear magnetic resonance

Magnetometer calibration setup controlled by nuclear magnetic resonance

For the calibration of magnetometer sensors in the field range from 1 mT to 200 mT, a measuring setup has been developed consisting of a water-cooled multilayer solenoid and a nuclear magnetic resonance (NMR)-magnetometer of the marginal oscillator type. With a coil constant of about 20 mT/A, the field coil provides a field profile with two flat regions, where the field maxima are equal within 10/sup -5/ and with a distance of more than 40 mn so that the magnetometer readings can be compared simultaneously. The NMR-magnetometer operates with water samples having an absorption linewidth of 2 /spl mu/T by adding paramagnetic CuSO/sub 4/-ions. The volume of the samples amounts to 0.8 cm/sup 3/ to 1.5 cm/sup 3/ for fields below 20 mT and 0.08 cm/sup 3/ to 0.5 cm/sup 3/ for higher fields. The uncertainty of detecting the center of the absorption line amounts to less than 0.1 /spl mu/T.

Kurt Weyand | K. Weyand

[1] K Weyand. A digitally programmable modulation and lock-in set-up , 1992 .

[2] W. Gosling,et al. Temperature-compensated precision solenoid , 1975 .

[3] J. Hak. Eisenlose Zylinderspulen mit ungleichmäßiger Windungsdichte zur Erzeugung von homogenen Feldern , 1936 .

[4] K. Weyand. First results of the γp experiment at the PTB , 1985, IEEE Transactions on Instrumentation and Measurement.

[5] K. Weyand. An NMR marginal oscillator for measuring magnetic fields below 50 mT , 1988, 1988 Conference on Precision Electromagnetic Measurements.

[6] Z. Frait,et al. Measurement of the proton NMR field shift in aqueous solutions containing Cu2+, Cr3+, Fe3+ and Mn2+ ions , 1973 .

[7] H. Carr,et al. The Principles of Nuclear Magnetism , 1961 .

[8] Barry N. Taylor,et al. The 1986 adjustment of the fundamental physical constants' prepared by , 1987 .