NMR Probe
First Claim
1. An NMR probe comprising:
- a resonant circuit resonating with first RF waves, the resonant circuit including a sample coil having a first and a second ends, a first transmission line having a first end and a second end grounded, and a second transmission line having a first end and a second end grounded, the sample coil being made of a conductor, the first end of the first transmission line being connected with the first end of the sample coil, the first end of the second transmission line being connected with the second end of the sample coil;
a first connector for entering and extracting the first RF waves; and
a first matching circuit connected between the first connector and the resonant circuit;
wherein the total transmission line length of the conductor of the sample coil, the first transmission line, and the second transmission line is set to a value at which standing waves given by
λ
+(n−
1)×
λ
/2are produced, where % is the wavelength of the first RF waves applied to the resonant circuit and n is a positive integer; and
wherein the sample coil is placed at a position where the strength of a produced magnetic field is maximized.
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Accused Products
Abstract
An NMR (nuclear magnetic resonance) probe is offered which produces a magnetic field strength adapted for producing an NMR signal within a sample coil. The probe has a resonant circuit including a sample coil, a first transmission line, and a second transmission line. The resonant circuit is designed taking account of the transmission line length Ls of the coil, the transmission line length La of the first line, and the transmission line length Lb of the second line. The coil is placed in a position where the magnetic field strength is maximized. Where the electrical characteristics of the resonant circuit are varied by connection of the coil and transmission lines, the transmission line lengths are corrected according to the variations.
9 Citations
12 Claims
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1. An NMR probe comprising:
-
a resonant circuit resonating with first RF waves, the resonant circuit including a sample coil having a first and a second ends, a first transmission line having a first end and a second end grounded, and a second transmission line having a first end and a second end grounded, the sample coil being made of a conductor, the first end of the first transmission line being connected with the first end of the sample coil, the first end of the second transmission line being connected with the second end of the sample coil; a first connector for entering and extracting the first RF waves; and a first matching circuit connected between the first connector and the resonant circuit; wherein the total transmission line length of the conductor of the sample coil, the first transmission line, and the second transmission line is set to a value at which standing waves given by
λ
+(n−
1)×
λ
/2are produced, where % is the wavelength of the first RF waves applied to the resonant circuit and n is a positive integer; and wherein the sample coil is placed at a position where the strength of a produced magnetic field is maximized. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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2. An NMR probe comprising:
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a resonant circuit resonating with first RF waves, the resonant circuit including a sample coil having a first and a second ends, a first transmission line having a first end and a second end grounded, and a second transmission line having a first end and a second end electrically opened, the sample coil being made of a conductor, the first end of the first transmission line being connected with the first end of the sample coil, the first end of the second transmission line being connected with the second end of the sample coil; a first connector for entering and extracting the first RF waves; and a first matching circuit connected between the first connector and the resonant circuit; wherein the total transmission line length of the conductor of the sample coil, the first transmission line, and the second transmission line is set to a value at which standing waves given by
(¾
)λ
+(n−
1)×
λ
/2are produced, where λ
is the wavelength of the first RF waves applied to the resonant circuit and n is a positive integer; andwherein the sample coil is placed at a position where the strength of a produced magnetic field is maximized.
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3. An NMR probe comprising:
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a resonant circuit resonating with first RF waves, the resonant circuit including a sample coil having a first and a second ends, a first transmission line having a first end and a second end electrically opened, and a second transmission line having a first end and a second end electrically opened, the sample coil being made of a conductor, the first end of the first transmission line being connected with the first end of the sample coil, the first end of the second transmission line being connected with the second end of the sample coil; a first connector for entering and extracting the first RF waves; and a first matching circuit connected between the first connector and the resonant circuit; wherein the total transmission line length of the conductor of the sample coil, the first transmission line, and the second transmission line is set to a value at which standing waves given by (n/2)λ
are produced, where λ
is the wavelength of the first RF waves applied to the resonant circuit and n is a positive integer; andwherein the sample coil is placed at a position where the strength of a produced magnetic field is maximized.
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4. An NMR probe comprising:
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a resonant circuit resonating with first RF waves, the resonant circuit including a sample coil having a first and a second ends, a first transmission line having a first end connected with the first end of the sample coil, and a second transmission line having a first end connected with the second end of the sample coil, the sample coil being made of a conductor, second ends of the first and second transmission lines being connected together; a first connector for entering and extracting the first RF waves; and a first matching circuit connected between the first connector and the resonant circuit; wherein the total transmission line length of the conductor of the sample coil, the first transmission line, and the second transmission line is set to a value at which standing waves given by nλ
are produced, where λ
is the wavelength of the first RF waves applied to the resonant circuit and n is a positive integer; andwherein the sample coil is placed at a position where the strength of a produced magnetic field is maximized.
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Specification