Spin resonance spectra detonator system - uses decoupling signal pulse groups in async. relation to signal scanning

摘要

The spins of one nuclear type of a specimen, located in a magnetic field, are energised by pulsed h.f. signals. The relaxation oscillations of the spin are repeatedly scanned in preset time intervals and recorded. A h.f. decoupling signal is applied to the specimen, in order to reduce a coupling with spins of other nuclear types. The signal consists of a periodical train of pulse groups, each containing at least one pulse. The pulses of a group are rated to provide together a rotation of the spin movements by n x 360 deg., n being an integral number or zero. The pulses are so short that their frequency spectrum, based on Fourier analysis, covers, the entire resonance region of the other nuclear type. The pulse groups of the decoupling signals are asynchronous in relation to the signal scanning.