The drive is used to operate and control the overhauser magnetometer and produce the proton precession signal. It is used to deflect the increased proton magnetization into the plane of precession and after the deflection pulse, the frequency measurement is done. And, while the existing deflected magnetization is precessing and being measured, a new one is being created by the Overhauser effect. After the frequency determination has been completed, we can apply another 90degree pulse and

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... e the measurements faster than would be possible with the classical proton magnetometer.