NMR systems employing inverted variable capacitors

Details NMR systems employing inverted variable capacitors NMR systems employing inverted variable capacitors

2006-04-04

2006-04-04

Shrivastav, Brij B. (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

C324S322000

Reexamination Certificate

active

07023210

ABSTRACT:
According to some embodiments, NMR (nuclear magnetic resonance) circuits include one or more variable capacitors each having two concentric cylindrical conductors. The inner conductor is connected to an upper external contact disposed closer to the NMR sample coil than the outer conductor. The inner conductor and upper contact are generally exposed to higher voltages than the outer conductor, and the upper contact is shorter than the outer conductor. Capacitance adjustment is performed by moving the inner conductor longitudinally within the outer conductor. Using a relatively short contact for the higher-voltage capacitor node allows reducing the surface area most conducive to arcing, and allows reducing lead lengths and stray capacitances. Shorting the capacitor may be performed by moving the inner conductor to contact a capacitor base situated opposite the upper external contact.

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Brochure by Voltronics Corporation entitled Voltronics Non-Magnetic Trimmer Capacitors, catalog was published in 1999 and became available to Applicant in 2001.

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