US3603871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nuclear magnetic resonance probe
Assignee: PerkinElmer Ltd
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Filing: 1969-08-04
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Granted: 1971-09-07
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Expires: 1989-08-04
Abstract
Abstract A predetermined amount of electromagnetic intercoupling is provided between segments of a transmitter winding and a receiver winding in a probe for a nuclear magnetic resonance apparatus. Circuit means are provided for adjusting the amplitude and phase of voltages induced in the receiver winding by each transmitter winding segment causing the induced voltages to oppose and to thereby reduce a standing signal in the receiver winding.
Inventors
- 👤 Jeffrey Malcolm Caunter
- 👤 Peter Higham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:48
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/36; G01R33/3621; G01R33/30; G01R33/3628
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
182 words
A probe arrangement for a Nuclear Magnetic Resonance apparatus comprising: a receiver winding positioned adjacent a sample under analysis and coupled to indicating means for sensing and indicating nuclear magnetic resonance of the sample; a transmitter winding having first and second spaced segments arranged about said receiver winding; means electrically coupling said winding segments in parallel to a source of irradiating RF potential; said transmitter winding segments positioned with relation to said receiver winding for establishing a predetermined electromagnetic coupling between each of said segments and the receiver winding for causing a voltage of substantially equal amplitude and of opposite polarity to be induced in said receiver winding by each of said winding segments; circuit means coupled to said winding segments of varying the amplitude and the phase of the Rf potential applied to each of said segments; said circuit means arranged for varying the voltages induced in the receiver winding by the two segments of the transmitter winding by an amount for reducing a standing signal in the receiver winding to a desired level in the absence of an NMR resonance.
Claim 2
Dependent Claim
182 words
A probe arrangement for a Nuclear Magnetic Resonance apparatus comprising: a receiver winding positioned adjacent a sample under analysis and coupled to indicating means for sensing and indicating nuclear magnetic resonance of the sample; a transmitter winding having first and second spaced segments arranged about said receiver winding; means electrically coupling said winding segments in parallel to a source of irradiating RF potential; said transmitter winding segments positioned with relation to said receiver winding for establishing a predetermined electromagnetic coupling between each of said segments and the receiver winding for causing a voltage of substantially equal amplitude and of opposite polarity to be induced in said receiver winding by each of said winding segments; circuit means coupled to said winding segments of varying the amplitude and the phase of the Rf potential applied to each of said segments; said circuit means arranged for varying the voltages induced in the receiver winding by the two segments of the transmitter winding by an amount for reducing a standing signal in the receiver winding to a desired level in the absence of an NMR resonance.
Claim 3
Dependent Claim
21 words
the probe arrangement as claimed in claim 9, wherein said transmitter winding segments are shaped to provide said predetermined electromagnetic coupling.
Claim 4
Dependent Claim
60 words
The probe arrangement as claimed in claim 2, wherein said transmitter winding segments are each shaped in the general configuration of a trapezium having two oppositely spaced sides of unequal length and are symmetrically mounted around a longitudinal axis of the probe, and wherein the two opposite unequal sides of the trapezium are each equidistantly spaced from said longitudinal axis.
Claim 5
Dependent Claim
28 words
The probe arrangement as claimed in claim 3, including a cylindrical former having an outer surface and wherein all sides of the trapezium are positioned on said surface.
Claim 6
Dependent Claim
30 words
The probe arrangement as claimed in claim 4, including a second cylindrical former and said receiver winding is mounted on said second cylindrical former and positioned within said first former.
Claim 7
Dependent Claim
51 words
The probe arrangement as claimed in claim 1, wherein said transmitter winding segments are of rectangular shape having two shorter sides and are symmetrically positioned about a longitudinal axis of the probe, said two shorter sides of said rectangular-shaped winding segment each spaced from the longitudinal axis by a different distance.
Claim 8
Dependent Claim
75 words
The probe arrangement as claimed in claim 1, wherein said circuit means for varying phase and amplitude of the RF signals applied to the transmitter winding segments include circuit means paired and arranged for differential phase control operation with a single control and circuit means paired and arranged for differential amplitude control operation with a single control whereby an instrument user adjusts one control with one hand and the other control with the other hand.
Claim 9
Dependent Claim
61 words
The probe arrangement as claimed in claim 7, wherein said circuit means for varying phase and amplitude of the RF signal applied to the transmitter winding signals include circuit elements having a characteristic thereof for varying in magnitude in response to a varying DC potential applied thereto and the probe is thereby remotely balanced with lead lines carrying a DC voltage.
Claim 10
Dependent Claim
21 words
The probe arrangement as claimed in claim 1, wherein said winding segments each comprise substantially a half of the transmitter winding.
References Cited (Backward Citations)
US2908858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |