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1. (WO1990007128) SYNTONISATION D'UNE SONDE D'UNE LIGNE DE TRANSMISSION A DISTANCE EFFICACE POUR UN APPAREIL DE RESONANCE MAGNETIQUE NUCLEAIRE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS
What is claimed is:
1. An NMR apparatus for exciting and detecting rf resonance of gyromagnetic resonators in a sample, comprising:
polarizing magnet means for establishing magnetic field wherein said resonantors precess,
rf source means for furnishing an rf magnetic field for applications at precessing resonators, thereby to transfer energy to said resonators through an excitation process,
rf receiver means for acquiring from said resonators a transient signal corresponding to a de-excitation process,
probe means comprising rf coil means for transferring rf power between said rf source and said sample, said probe means comprising an rf coil disposed proximate said sample and a transmission line means for transport of rf power between said rf coil and said rf source,
fixed local tuning means disposed between said coil and said transmission line means for partially matching the transmission line means to the rf coil and approximately tuning said rf coil to a resonant condition at a preselected frequency, said partial matching characterized by a reflection coefficient no greater than substantially 0.9,
remote variable tuning means disposed between said transmission line and said rf source, said remote variable tuning means for further tuning said rf coil to said resonant condition, whereby the "approximate tuning is supplemented by said remote variable tuning means to closely approach an exact resonant condition for dissipation of rf power in said rf coil.