US3753097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gyromagnetic resonance spectrometers
Assignee: Thales SA
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Filing: 1971-12-03
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Granted: 1973-08-14
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Expires: 1991-12-03
Abstract
Abstract In a gyromagnetic resonance spectrometer where the specimen is rotated about an axis, and where the polarization field is modulated at a low angular frequency Omega , the synchronous detection of the HF components, in phase with the excitation, of the output signals from the resonant detector circuit gives a signal at the frequency Omega , a d.c. component, and a component at the rotation speed which, by means of filters, are respectively directed to the recorder, to a circuit correcting the resonance frequency of, or the coupling in, the resonant detector circuit, and to a rotation speed measurement system.
Inventors
- 👤 J Dunand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:46
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/30; G01R33/307; G01R33/32; G01R33/36; G01R33/3607; G01R33/44; G01R33/46
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
A gyromagnetic resonance spectrometer comprising : a resonant detector circuit for receiving a specimen, means for generating a magnetic polarization field in said detector circuit, and a high frequency generator for generating an electromagnetic field in said detector circuit, said detector circuit delivering output signals comprising HF in-phase and quadrature components relatively to the HF excitation of said detector circuit ; means for rotating said specimen about an axis; a high frequency synchronous detector having a first input coupled to said detector circuit for receiving the output signal thereof, and a second input coupled to said high frequency generator for receiving a reference signal for detecting the HF in-phase components of said output signals; band-pass filtering means coupled to the output of said synchronous detector for selecting that low frequency component of the output signal of said synchronous detector which has a frequency equal to that of the rotation frequency of said specimen; and means for measuring the frequency of said low frequency component.
Claim 2
Dependent Claim
164 words
A gyromagnetic resonance spectrometer comprising : a resonant detector circuit for receiving a specimen, means for generating a magnetic polarization field in said detector circuit, and a high frequency generator for generating an electromagnetic field in said detector circuit, said detector circuit delivering output signals comprising HF in-phase and quadrature components relatively to the HF excitation of said detector circuit ; means for rotating said specimen about an axis; a high frequency synchronous detector having a first input coupled to said detector circuit for receiving the output signal thereof, and a second input coupled to said high frequency generator for receiving a reference signal for detecting the HF in-phase components of said output signals; band-pass filtering means coupled to the output of said synchronous detector for selecting that low frequency component of the output signal of said synchronous detector which has a frequency equal to that of the rotation frequency of said specimen; and means for measuring the frequency of said low frequency component.
Claim 3
Dependent Claim
41 words
A gyromagnetic resonance spectrometer as claimed in claim 1, further comprising means for deriving an error signal representative of the difference between the frequency of said rotation signal and an assigned frequency, and applying said error signal to said rotating means.
Claim 4
Dependent Claim
103 words
A gyromagnetic resonance spectrometer as claimed in claim 1, further comprising : a low frequency generator for modulating said polarization field at an angular frequency Omega ; a low frequency synchronous detector for detecting that component of the output signal from said high frequency detector which is at said frequency Omega ; a low pass filter connected to the output from said high frequency synchronous detector; and correcting means, fed by said low pass filter, for acting on a high frequency element of said gyromagnetic device so as to minimize the d.c. component of the output signal from said high frequency synchronous detector.
Claim 5
Dependent Claim
32 words
A gyromagnetic resonance spectrometer as claimed in claim 3 , wherein said resonant detector circuit comprises a variable capacity element, and wherein said correcting means are coupled to said variable capacity element.
Claim 6
Dependent Claim
57 words
A gyromagnetic resonance spectrometer as claimed in claim 3, wherein said resonant detector circuit comprises a pair of Bloch coils, and a paddle inserted between the coils of said pair for adjusting the phase of the leakage between said coils, and wherein said correcting means comprise a motor controlled by said low-pass filter and controlling said paddle.
References Cited (Backward Citations)
US2908858A
Cited
US3462677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |