A helium magnetometer that utilizes light-modulation
Aldrich, Robert G.
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The detection of the Zeeman effect by spin precession experiments has led to the development of magnetometers which utilize vapor or gaseous sensing devices capable of high precision. A recent example of this type of instrument is the helium gas magnetometer. The purpose of this paper is to present the background theory of a helium magnetometer which utilizes a modulated pumping light, and to describe the equipment used to construct an experimental magnetometer system. The feasibility of this system as an instrument to measure changes in the earth* s magnetic field is confirmed by comparison with a commercial magnetometer. The author's work on this device was accomplished at the Varian Associates research laboratory at Palo Alto, California, during the period January to March, 1961. The author wishes to express his appreciation for the assistance and encouragement given him by Drs . A. L. Bloom and W. E. Bell of Varian Associates during this period.
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