Multiple-tuned circuit and probe for NMR spectrometer
AssigneeJEOL Ltd.
InventorKenichi Hasegawa
Life of this patent
Estimating the term…
Abstract
A multiple-tuned circuit and a probe for use in a nuclear magnetic resonance (NMR) spectrometer. The multiple-tuned circuit having improved power capacity, thus permitting injection of high electric power. The multiple-tuned circuit and probe improve the resonance frequencies at higher and lower frequencies. Instead of the prior art coaxial resonator that is an unbalanced circuit, a balanced resonator circuit is used. A tuning circuit and a matching circuit for a higher frequency is connected in an intermediate position in the balanced resonator circuit. A tuning capacitive element for a lower frequency is inserted between the balanced resonator circuit and a sample coil or in an intermediate position in the balanced resonator circuit.
Claims19
A multiple-tuned circuit for use in a nuclear magnetic resonance spectrometer, comprising:
- a sample coil having ends A and B;
- a first conductor having one end connected with the end A of the sample coil and another end connected to ground via a capacitive element or directly;
- a second conductor having one end connected with the end B of the sample coil and another end connected to ground via a capacitive element or directly;
- a tuning capacitive element for a second frequency, said tuning capacitive element being inserted in at least one of a first junction at the end A of the sample coil and said first conductor, a given position closer to said first conductor than said first junction, a second junction at the end B of the sample coil and said second conductor, and a given position closer to said second conductor than said second junction;
- a matching circuit and a tuning circuit for a first frequency;
- and
- a matching circuit for said second frequency.
A probe for use in an NMR spectrometer, said probe including a multiple-tuned circuit comprising:
- a sample coil having ends A and B;
- a first conductor having one end connected with the end A of the sample coil and another end connected to ground via a capacitive element or directly;
- a second conductor having one end connected with the end B of the sample coil and another end connected to ground via a capacitive element or directly;
- a tuning capacitive element for a second frequency, said tuning capacitive element being inserted in at least one of a first junction of the end A of the sample coil and said first conductor, a given position closer to the first conductor than said first junction, a second junction of the end B of the sample coil and said second conductor, and a given position closer to the second conductor than said second junction;
- a matching circuit and a tuning circuit for a first frequency;
- a matching circuit for said second frequency;
- and
- a tubular electrode surrounding at least outer surfaces of electrical circuit portions of the multiple-tuned circuit, said tubular electrode being used as a grounding electrode for said multiple-tuned circuit.
Dependencies are inferred from the claim text.