STUDY AND INVESTIGATION OF A PROTON MASER ANTENNA.
NATIONAL CO INC MELROSE MASS
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A new concept in a low frequency magnetic field sensor the proton maser antenna is presented. The basic theory of the Promant operation is explored and calculations are given for the threshold sensitivity in terms of the system parameters. The response of the Promant was studied in the frequency range from dc to 1000 cs. The general details of the theoretically predicted behavior were realized with a breadboard model Promant. Although the Promant was tested within a screen room, which provided a 23db attenuation of external low frequency magnetic fields, indications are that the ambient noise background of the industrial environment was so high as to affect the measurements of ultimate sensitivity. With broad band filtering spurious responses are often obvious and can be disregarded. However, as more restricted bandwidths are employed the problem of discerning between internal noise and external activity becomes impossible. Under such conditions with a .08cs bandwidth at 40cs, a test signal of .0051 could be observed against the total background. The present research effort has shown that Promant is an extremely sensitive low frequency magnetic field sensor. Author