METHODS OF MEASURING WEAK MAGNETIC FIELDS BY NUCLEAR INDUCTION
The frequency of nuclear precession of the protons in a liquid sample that contains parametric impurities is measured. The line of electronic resonance of the impurity, which exhibits hyperfine structure, is saturated by applying a strong field perpendicular to the field to be measured. The high frequency of oscillation of the electronic resonance greatly increases the polarization of the nuclear spins. A measurable amplitude of the Larmor frequency of nuclear precession is obtained by first applying a h-f a-c voltage to the first of mutually perpendicular windings to produce saturation of the electronic resonance line and then a direct voltage to the second winding to produce a weak polarizing magnetic field. The polarizing magnetic field is then rapidly suppressed, and the second winding is immediately connected to a frequency-measuring instrument. (R.E.U.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-18-004068
- OSTI ID:
- 4128377
- Report Number(s):
- GB 941310
- Country of Publication:
- United Kingdom
- Language:
- English
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