Multiple tuning circuit and probe having multiple tuning circuit for NMR spectrometer
First Claim
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1. A multiple tuning circuit for use in an NMR spectrometer, said multiple tuning circuit comprising:
- a sample coil having ends A and B, said end A being grounded via a first capacitive element, said end B being grounded via a second capacitive element;
a first inductor having a first end connected with the end A of said sample coil via a third capacitive element, said first inductor having a second end grounded;
a second inductor having a first end connected with the end B of said sample coil via a fourth capacitive element, said second inductor having a second end grounded;
a first set of matching circuit and tuning circuit for supplying first RF to said sample coil; and
a second set of matching circuit and tuning circuit for supplying second RF to said sample coil, wherein said sample coil, first inductor, second inductor, first capacitive element, second capacitive element, third capacitive element, and fourth capacitive element together form a balanced resonant circuit where voltage amplitude becomes zero near a center point of the sample coil.
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Abstract
A multiple tuning circuit is offered which is for use in a nuclear magnetic resonance spectrometer and which has a resonant circuit having improved resistance to RF voltages. If high RF power is injected, electric discharge is unlikely to occur. A sample coil and inductors together form a balanced resonant circuit where the RF amplitude voltage becomes zero near the center point of the sample coil. Each of the inductors is connected with the sample coil via a capacitive element. An RF voltage produced across the sample coil and an RF voltage produced across each inductor are not added up.
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Citations
32 Claims
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1. A multiple tuning circuit for use in an NMR spectrometer, said multiple tuning circuit comprising:
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a sample coil having ends A and B, said end A being grounded via a first capacitive element, said end B being grounded via a second capacitive element;
a first inductor having a first end connected with the end A of said sample coil via a third capacitive element, said first inductor having a second end grounded;
a second inductor having a first end connected with the end B of said sample coil via a fourth capacitive element, said second inductor having a second end grounded;
a first set of matching circuit and tuning circuit for supplying first RF to said sample coil; and
a second set of matching circuit and tuning circuit for supplying second RF to said sample coil, wherein said sample coil, first inductor, second inductor, first capacitive element, second capacitive element, third capacitive element, and fourth capacitive element together form a balanced resonant circuit where voltage amplitude becomes zero near a center point of the sample coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 16)
(A) said third capacitive element connected with the end A of said sample coil is split into at least two parts connected in series; (B) one end of said first capacitive element and one end of said first set of matching circuit and tuning circuit are connected with a junction of these parts connected in series;
(C) another end of said first capacitive element and another end of said first set of matching circuit and tuning circuit are grounded;
(D) said fourth capacitive element connected with the end B of said sample coil is split into at least two parts connected in series;
(E) one end of said second capacitive element for bringing said first RF into resonance is connected with a junction of these parts of said fourth capacitive elements connected in series; and
(F) another end of said second capacitive element is grounded.
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9. A multiple tuning circuit for use in an NMR spectrometer as set forth in any one of claims 1-4, wherein a capacitive element of a variable or fixed capacitance is connected in parallel with at least one of said first and second inductors.
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16. A multiple tuning circuit for use in an NMR spectrometer as set forth in any one of claims 1-4 and 10-12 for analysis of a sample having at least two resonating nuclei resonating at different frequencies, said first RF being the frequency of one resonating nuclei which is higher in frequency than said second RF being the resonant frequency of another resonating nuclei.
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10. A multiple tuning circuit for use in an NMR spectrometer, said multiple tuning circuit comprising:
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a sample coil having ends A and B;
a first inductor having a first end connected with the end A of said sample coil via first and second capacitive elements, said first inductor having a second end grounded;
a second inductor having a first end connected with the end B of said sample coil via third and fourth capacitive elements, said second inductor having a second end grounded;
one or more fifth capacitive elements for connecting a junction of said first and second capacitive elements with a junction of said third and fourth capacitive elements directly or indirectly via ground;
a first matching circuit for supplying first RF to said sample coil; and
a second matching circuit for supplying second RF to said sample coil, wherein said sample coil, first inductor, second inductor, first capacitive element, second capacitive element, third capacitive element, and fourth capacitive element together form a balanced resonant circuit where an amplitude voltage becomes zero near a center point of the sample coil. - View Dependent Claims (11, 12, 13, 14, 15)
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17. A multiple tuning circuit for use in an NMR spectrometer, said multiple tuning circuit comprising:
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a sample coil having ends A and B;
a second inductor having a first end connected with the end A of said sample coil via a first capacitive element, a first inductor, and a second capacitive element, said second inductor having a second end grounded;
a fourth inductor having a first end connected with the end B of said sample coil via a third capacitive element, a third inductor, and a fourth capacitive element, said fourth inductor having a second end grounded;
one or more fifth capacitive elements for connecting a junction of said first inductor and said second capacitive element with a junction of said third inductor and said fourth capacitive element directly or indirectly via ground;
a first matching circuit for supplying first RF to said sample coil;
a second matching circuit for supplying second RF to said sample coil; and
a third matching circuit for supplying third RF to said sample coil, wherein said sample coil, first inductor, second inductor, third inductor, fourth inductor, first capacitive element, second capacitive element, third capacitive element, and fourth capacitive element together form a balanced resonant circuit where an amplitude voltage becomes zero near a center point of said sample coil. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A probe for use in an NMR spectrometer, said probe including a multiple tuning circuit, said multiple tuning circuit comprising:
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a sample coil having ends A and B, said end A being grounded via a first capacitive element, said end B being grounded via a second capacitive element;
a first inductor having a first end connected with the end A of said sample coil via a third capacitive element, said first inductor having a second end grounded;
a second inductor having a first end connected with the end B of said sample coil via a fourth capacitive element, said second inductor having a second end grounded;
a first set of matching circuit and tuning circuit for supplying first RF to said sample coil;
a second set of matching circuit and tuning circuit for supplying second RF to said sample coil; and
an electrical circuit portion whose outside is surrounded by a cylindrical electrode that is used as a grounding electrode of the multiple tuning circuit. - View Dependent Claims (30)
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28. A probe for use in an NMR spectrometer, said probe including a multiple tuning circuit, said multiple tuning circuit comprising:
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a sample coil having ends A and B;
a first inductor having a first end connected with the end A of said sample coil via first and second capacitive elements, said first inductor having a second end grounded;
a second inductor having a first end connected with the end B of said sample coil via third and fourth capacitive elements, said second inductor having a second end grounded;
one or more fifth capacitive elements for connecting a junction of said first and second capacitive elements with a junction of said third and fourth capacitive elements directly or indirectly via ground;
a first matching circuit for supplying first RF to said sample coil;
a second matching circuit for supplying second RF to said sample coil; and
an electrical circuit portion surrounded by a cylindrical electrode that is used as a grounding electrode of the multiple tuning circuit.
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29. A probe for use in an NMR spectrometer, said probe including a multiple tuning circuit, said multiple tuning circuit comprising:
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a sample coil having ends A and B;
a second inductor having a first end connected with the end A of said sample coil via a first capacitive element, a first inductor, and a second capacitive element, said second inductor having a second end grounded;
a fourth inductor having a first end connected with the end B of said sample coil via a third capacitive element, a third inductor, and a fourth capacitive element, said fourth inductor having a second end grounded;
one or more fifth capacitive elements for connecting a junction of said first inductor and said second capacitive element with a junction of said third and fourth capacitive elements directly or indirectly via ground;
a first matching circuit for supplying first RF to said sample coil;
a second matching circuit for supplying second RF to said sample coil;
a third matching circuit for supplying third RF to said sample coil; and
an electrical circuit portion whose outside is surrounded by a cylindrical electrode that is used as a grounding electrode of the multiple tuning circuit.
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31. A magic angle spinning probe for use in an NMR spectrometer, said probe comprising:
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a sample coil having ends A and B;
a first capacitor having a first end connected with the end A of said sample coil, said first capacitor having a second end grounded; and
a second capacitor having a first end connected with the end B of said sample coil, said second capacitor having a second end grounded;
wherein said sample coil, first capacitor, and second capacitor together form a balanced resonant circuit for bringing an RF amplitude voltage near a center point of said sample coil to zero; and
wherein said probe has an electrical circuit portion whose outside is surrounded by a cylindrical electrode that is used as a grounding electrode of this electrical circuit portion. - View Dependent Claims (32)
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Specification