Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1996-07-17
1998-05-19
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01V 300
Patent
active
057540489
ABSTRACT:
A method and apparatus precisely controlling the periodic motion of an object is specifically applicable to the control of the rotation of a nuclear magnetic resonance (NMR) spectrometer rotor, and uses a fluid source having a fluid output with a time-varying magnitude. The output of the fluid source is coupled to a stator housing within which the rotor is rotatably disposed such that the time varying fluid pressure from the fluid source impinges upon a plurality of vanes located about a circumference of the rotor. The coupling of the fluid flow to the rotor results in a periodicity of the rotor rotation being proportional to a periodicity of the time varying magnitude of the fluid flow. This, in turn, creates a plurality of stable equilibrium rotation rates at which a frequency locking effect is achieved that tends maintain the rotor periodicity at a predetermined rate, thereby achieving particularly precise and stable rotor rotation.
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Arana Louis M.
Bruker Instruments, Inc.
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