The principle of Nuclear Magnetic Resonance has, for many years, been applied to the measurement of the earth's magnetic field. Of the magnetometers based on this principle, the Free Precession Magnetometer gives the best absolute accuracy available today. Disadvantages of this device are its comparatively slow data rate and transients created by the polarizing current pulses. The application of the Overhauser Effect, or Dynamic Polarization, to a nuclear resonance magnetometer offers advantages in increased data rate and accuracy. Such magnetometers have been limited by the short lifetime of the sample material. Three devices, in which dynamic polarization is used, are described. One of these, a maser oscillator, seems particularly promising. Also included is a study of the requirements for long-lifetime materials suitable for use in a magnetometer.http://www.archive.org/details/applicationofdyn00burcLieutenant, United States Nav
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