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CONDITIONS OF MAXIMUM AMPLITUDE OF A NUCLEARRESONANCE SIGNAL IN A FLOW-THROUGH PICKUP,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Considered is the physical aspect of the phenomenon occurring in a flow-through pickup of nuclear magnetic resonance. A liquid polarized in the magnetic field of a polarizing magnet flows into the coil of the pickup having the vector of magnetization of the nuclei M directed parallel to the outer field H sub O in the pickup. If in the coil of the pickup there is an oscillating magnetic field H sub 1 with the frequency omega equals gamma H sub O, then the vector of the magnetization of the nuclei will be inclined to the direction of the internal field, the angle of deviation nutation being theta equals gamma H sub 1 XW, where X is the distance traversed by the liquid in the coil of the pickup, and W is the speed of the liquid. The amplitude of the signal of nuclear resonance inducible in the coil of the circuit by the precessioning nuclei is proportional to the projection of the vector of magnetization directed transversely to the inner magnetic field, i. e., the value M sub 1 M sin theta.
Unedited rough draft trans. of Akademiya Nauk SSSR. Izvestiya. Seriya Fizicheskaya, 1963, v. 27, no. 7, p. 942-944.