Title :
An NMR marginal oscillator for measuring magnetic fields below 50 mT
Author_Institution :
Phys.-Tech. Bundesanstalt, Braunschweig, West Germany
fDate :
4/1/1989 12:00:00 AM
Abstract :
A marginal oscillator, developed to measure or control magnetic fields in the flux-density range from 50 mT down to 1 mT by using nuclear magnetic resonance (NMR), is described. This provides additional signal-dependent modulation of the feedback conductance, considerably increasing the signal-to-noise ratio. Observing proton resonance in an aqueous CuSO4 solution, a sample volume of about 2 cm3 has led to a signal-to-noise ratio of 50 dB obtained in a field with a flux density of 15 mT
Keywords :
copper compounds; magnetic field measurement; nuclear magnetic resonance spectroscopy; oscillators; proton magnetic resonance; CuSO4; NMR marginal oscillator; aqueous solution; feedback conductance; magnetic field control; nuclear magnetic resonance; proton resonance; signal-dependent modulation; signal-to-noise ratio; Absorption; Density measurement; Frequency; Magnetic field measurement; Magnetometers; Nuclear magnetic resonance; Nuclear measurements; Oscillators; Pulse measurements; Volume measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
