Patent US3699428A successfully refreshed from Google Patents.
US3699428A
Expired / Lapsed
US
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Nuclear magnetic resonance spectrometer system
Assignee: PerkinElmer Ltd
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Filing: 1969-07-07
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Granted: 1972-10-17
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Expires: 1989-07-07
Abstract
Abstract A nuclear magnetic resonance system is provided which comprises a N.M.R. spectrometer having field modulation and an accessory means adapted to be operationally coupled to the spectrometer for providing alternatively spin decoupling or field locking facilities. The accessory means includes a variable frequency oscillator that is coupled to the field modulation means of the N.M.R. spectrometer through a variable attenuator. The variable frequency oscillator is swept in synchronism with the field modulation means so that a working sideband component exhibiting a fixed frequency is generated during this sweep. The attenuator is adjusted to attenuate the oscillatory signal to one level when the spectrometer is operated in the spin decoupling mode and to attenuate the oscillatory signal to a second level when the spectrometer is operated in the field stabilization mode.
Inventors
- 👤 John Bryant Leane
- 👤 Peter Higham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:39
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/46; G01R33/28; G01R33/38; G01R33/389; G01R33/32; G01R33/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
173 words
A nuclear magnetic resonance analysis apparatus having means for establishing a magnetic polarizing field at a sample station, a means for irradiating the sample station at a relatively high frequency to excite gyromagnetic resonance in a sample of matter located in said sample station, a means providing field modulation of said magnetic polarizing field for generating sidebands one of which being a measuring sideband component, a means for sweeping the field and sensing means for indicating gyromagnetic resonance in a sample located at the sample station, and an accessory means for alternatively selectively providing magnetic field intensity stabilization and decoupling of spin resonance, said accessory means including a variable frequency oscillator, a variable attenuator, means connecting the variable frequency oscillator to the means providing field modulation through said variable attenuator, and means for adjusting said attenuator to attenuate the signal from said variable frequency oscillator to one level in order to operate in a spin decoupling mode and to attenuate said signal to a second level to operate in said field stabilization mode.
Claim 2
Dependent Claim
173 words
A nuclear magnetic resonance analysis apparatus having means for establishing a magnetic polarizing field at a sample station, a means for irradiating the sample station at a relatively high frequency to excite gyromagnetic resonance in a sample of matter located in said sample station, a means providing field modulation of said magnetic polarizing field for generating sidebands one of which being a measuring sideband component, a means for sweeping the field and sensing means for indicating gyromagnetic resonance in a sample located at the sample station, and an accessory means for alternatively selectively providing magnetic field intensity stabilization and decoupling of spin resonance, said accessory means including a variable frequency oscillator, a variable attenuator, means connecting the variable frequency oscillator to the means providing field modulation through said variable attenuator, and means for adjusting said attenuator to attenuate the signal from said variable frequency oscillator to one level in order to operate in a spin decoupling mode and to attenuate said signal to a second level to operate in said field stabilization mode.
Claim 3
Dependent Claim
37 words
The apparatus of claim 1, wherein said means for sweeping the field is coupled to said variable frequency oscillator for varying the frequency thereof to generate a sideband component having a predetermined fixed frequency during field sweep.
Claim 4
Dependent Claim
26 words
The apparatus of claim 2 wherein said field sweep means includes means for synchronously varying said field and altering the frequency of said variable frequency oscillator.
Claim 5
Dependent Claim
29 words
The apparatus of claim 3 that further includes a phase detector coupled to said sensing means for detecting deviations in said field when operated in said field stabilization mode.
Claim 6
Dependent Claim
49 words
The apparatus of claim 4 wherein said nuclear magnetic resonance apparatus further includes a field correction winding; and said phase detector provides a corrective output signal indicative of the deviation of said field intensity of a desired magnitude, and means coupling said output signal to said field correcting winding.
Claim 7
Dependent Claim
13 words
The apparatus of claim 5 wherein said coupling means comprises a DC amplifier.
References Cited (Backward Citations)
US3487293A
Cited
US3500178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |