Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1989-01-23
1990-04-24
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01R 3320
Patent
active
049203177
ABSTRACT:
An oscillator is provided whose oscillation frequency is substantially proportional to the intensity of the ambient magnetic field, and which is used for measuring said magnetic field, and comprising a magnetic resonance magnetrometric probe for detecting a signal at the frequency of said magnetic resonance in response more particularly to a low frequency excitation signal and means for generating said low frequency excitation signal in response to the detected signal, said generation means comprising a loop for locking the phase of said low frequency excitation signal to the phase of said detected signal, and initialization means so that said low frequency excitation signal sweeps a range of frequencies when said loop is not locked.
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K. H. Carpenter and M. K. daSilva "Phase-Locked Yttrium Iron Garnet Magnetometer for Remote Measurement of Small Field Changes in a Fluctuating Background", Rev of Sci Instru (No. 9 (9/82), pp. 1414-1417.
Crouzet (Societe Anonyme francaise)
Tokar Michael J.
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