Free nuclear precession gradiometer system

Details Free nuclear precession gradiometer system Free nuclear precession gradiometer system

1983-07-01

1985-10-08

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a magnetometer

G01R 3300

Patent

active

045463174

ABSTRACT:
A free nuclear precession gradiometer uses a fluid sample surrounded by a il the fluid sample containing one or more nuclear species which display a magnetic moment. Current in the coil polarizes the nucleii, which when the current is abruptly terminated precess coherently about the earth's magnetic field. The exact frequency generated is a precise measure of the absolute value of the earth's magnetic field. The signal is in the form of a damped sinusoid with the rate of decay being a function of gradients in the ambient magnetic field. Two vector magnetometers are mounted rigidly on the sensor at the right angles to each other and to the earth's magnetic field. A servo system continuously orients the sensor in a two-axis gimbal system to reduce the output of the vector magnetometers to zero. The instrument is polarized, a counter is triggered to make the frequency measurement, and the signal is analyzed by determining the average amplitude of the signal over a precise interval of time. The result is simultaneous measurement of total intensity and total gradient.

REFERENCES:
patent: 3249856 (1966-05-01), Lemaire
patent: 3373650 (1968-03-01), Killpatrick
patent: 3495160 (1970-02-01), Raffini
patent: 3525928 (1970-08-01), Nagao
patent: 3577068 (1971-05-01), La Force
patent: 3750008 (1973-07-01), Asano
patent: 3886440 (1975-05-01), Berry
patent: 4114087 (1978-09-01), Fry
patent: 4418316 (1983-11-01), Young

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