NMR frequency locking circuit

Details NMR frequency locking circuit NMR frequency locking circuit

1990-11-07

1992-11-24

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324307, G01R 3320

Patent

active

051666200

ABSTRACT:
An NMR locking mechanism for use with not only electromagnets, superconducting magnets and permanent magnets, but also with ultrahigh energy product magnets such as neodynium. The circuit utilizes a single conversion superheterodyne receiver with a phase locked loop that forms a locking mechanism that depends upon a variable frequency. The resonant frequency of the nuclei is compared to a variable excitation frequency which is adjusted to maintain a control frequency with one unique value of the control frequency being zero at lock.

REFERENCES:
patent: 4875486 (1989-10-01), Rapoport et al.
"Locked NQR Spectrometer for Pressure Measurements" by R. C. Frisch, Journal of Research NBS, vol. 74C, Nos. 1 & 2, pp. 3-8 (May 18, 1970).
"Locked NQR Spectrometer" by R. J. Vorpicelli et al., The Review of Scientific Instrum., vol. 36, No. 2, Feb. 1965.

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