Method for reducing the coupling between excitation and receive coils of a nuclear quadrupole resonance detection system
First Claim
1. A method for reducing coupling in a nuclear quadrupole resonance detection system that is comprised of at least one excitation coil and at least one high temperature superconductor receive coil, the excitation coil and the receive coil each being tuned to the same resonance frequency, wherein the method comprises shifting, during excitation, the resonance frequency of the receive coil to a different resonance frequency thereby to reduce coupling between the excitation coil and the receive coil.
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Abstract
This invention relates to a method for improving the performance of a nuclear quadrupole resonance detection system by reducing the coupling between one or more excitation coils that provide a radio frequency magnetic field that excites quadrupole nuclei, and one or more high temperature superconductor receive coils that detect the resulting nuclear quadrupole resonance signal.
111 Citations
18 Claims
- 1. A method for reducing coupling in a nuclear quadrupole resonance detection system that is comprised of at least one excitation coil and at least one high temperature superconductor receive coil, the excitation coil and the receive coil each being tuned to the same resonance frequency, wherein the method comprises shifting, during excitation, the resonance frequency of the receive coil to a different resonance frequency thereby to reduce coupling between the excitation coil and the receive coil.
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11. A method for reducing coupling of coils in a nuclear quadrupole resonance detection system that is comprised of one or more excitation coils and one or more high temperature superconductor receive coils, wherein the method comprises the step of:
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shifting, during excitation, the resonance frequency of the receive coil(s) to thereby reduce coupling between the excitation coil(s) and the receive coil(s), wherein the step of shifting the resonance frequency of a receive coil itself comprises the step of; providing for that coil a resonance frequency-shifting circuit associated with that coil, the resonance frequency-shifting circuit comprising; (a) a single loop or coil inductively coupled to the receive coil; (b) a reactance in series with the single loop or coil; and (c) means to connect the reactance to, and disconnect the reactance from, the single loop or coil, wherein the means to connect the reactance to, and disconnect the reactance from, the single loop or coil comprises a cross-diode pair switch. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification