Multiple tuning NMR probe
AssigneesPhospho-Energetics, Inc., Trustees of the Univ. of Pennsylvania
InventorsMitchell D. Schnall, John S. Leigh, Jr., V. Harihara Subramanian
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Abstract
A multiple tuning NMR probe includes a radio frequency (RF) probe tuned by means of a circuit which creates a multiple pole circuit response in the probe, each of the poles being sufficiently separated from each other as to cause resonance of the probe at distinct frequencies. When tuning for nuclei with resonances substantially apart, this function may be accomplished using a parallel capacitor-inductor (L-C) trap with an impedance matching network. When tuning for nuclei with substantially closely spaced resonances, a tank circuit is used which has a single resonance which is split into two resonances by strongly coupling it to another tank circuit in resonance with the sample coil tank circuit.
Claims19
An NMR probe having an electrical circuit including an alternating current power source, an RF coil driven by said power source, tuning circuit means connected to said RF coil for providing a plurality of resonance frequencies for said RF coil, said tuning circuit means having a transfer function, and a matching impedance means connected to said tuning circuit means for matching the impedance of said tuning circuit to the impedance of said power source,
- wherein said RF coil of said probe is multiply-tuned to a plurality of NMR frequencies for concurrent study of nuclei in a sample as concurrently detected by said RF coil, said transfer function having a plurality of poles in accordance with said plurality of NMR frequencies.
A multiply-tuned radio frequency probe for use in nuclear magnetic resonance (NMR) spectroscopy and imaging, comprising:
- probe means for generating a radio-frequency pulse;
- and
- circuit response means for creating a multiple pole circuit response in said probe means, each said pole being sufficiently separated from one another as to cause resonance of said probe means at distinct frequencies.
Dependencies are inferred from the claim text.