US3826972A
Expired / Lapsed
US
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Method and apparatus for detecting nuclear magnetic resonance
Assignee: Leland Stanford Junior University
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Filing: 1973-08-17
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Granted: 1974-07-30
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Expires: 1993-08-17
Abstract
Abstract Apparatus for detecting nuclear magnetic resonance in which the sample is subjected to a high magnetic field in one direction to polarize the nuclear spins, then an alternating radio frequency magnetic field is applied to the sample and varied from a frequency below the resonant frequency of interest of the sample to a frequency above the resonant frequency, or vice versa, at a rate which provides adiabatic fast passage. A detector detects the change in the magnetization parallel to the direction of the magnetic field during said adiabatic fast passage. The method of detecting nuclear magnetic resonance which comprises polarizing the sample, changing the steady state value of the longitudinal magnetization and detecting the change in the steady state value of the longitudinal magnetization.
Inventors
- 👤 E Day
- 👤 W Fairbank
- 👤 J Opfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:30
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/30; G01R33/31; G01R33/44; G01R33/46
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
80 words
Apparatus for detecting nuclear resonance in a sample comprising means for generating a highly stable uni-directional magnetic field, means for placing a sample in said magnetic field to polarize the nuclear spins, means for applying alternating magnetic field to the sample at a frequency which is variable at a predetermined rate from below the resonant frequency tO above the resonant frequency to cause adiabatic fast passage, and means for detecting the change in longitudinal magnetization during the adiabatic fast passage.
Claim 2
Dependent Claim
80 words
Apparatus for detecting nuclear resonance in a sample comprising means for generating a highly stable uni-directional magnetic field, means for placing a sample in said magnetic field to polarize the nuclear spins, means for applying alternating magnetic field to the sample at a frequency which is variable at a predetermined rate from below the resonant frequency tO above the resonant frequency to cause adiabatic fast passage, and means for detecting the change in longitudinal magnetization during the adiabatic fast passage.
Claim 3
Dependent Claim
22 words
Apparatus as in claim 1 wherein said means for generating a highly stable uni-directional magnetic field comprises a superconducting persistent mode solenoid.
Claim 4
Dependent Claim
28 words
Apparatus as in claim 1 wherein said means for detecting the adiabatic fast passage comprises a pick-up coil disposed with its axis parallel to the uni-directional magnetic field.
Claim 5
Dependent Claim
21 words
Apparatus as in claim 3 including a magnetometer connected to said coil adapted to indicate the detection of adiabatic fast passage.
Claim 6
Dependent Claim
18 words
Apparatus as in claim 1 wherein said means for detecting the change in longitudinal magnetization includes a magnetometer.
Claim 7
Dependent Claim
10 words
Apparatus as in claim 5 wherein said magnetometer is superconducting.
Claim 8
Dependent Claim
14 words
Apparatus as in claim 4 in which the pick-up coil and magnetometer are superconducting.
Claim 9
Dependent Claim
53 words
Apparatus as in claim 1 wherein said highly stable uni-directional magnetic field is available at one region of said apparatus and wherein said means for causing the adiabatic fast passage and the means for detecting the change in longitudinal magnetization are disposed in another region of the apparatus separate from said first region.
Claim 10
Dependent Claim
48 words
Apparatus as in claim 8 including means for moving a sample between said first and second regions whereby the sample is polarized in the first region, moved to the second region where it is subjected to an adiabatic fast passage and the change in longitudinal magnetization is detected.
Claim 11
Dependent Claim
44 words
Apparatus as in claim 1 wherein said means for detecting the change in longitudinal magnetization is spaced from said means for generating the highly stable uni-directional magnetic field and the means for applying alternating magnetic field to the sample to cause adiabatic fast passage.
Claim 12
Independent Claim
86 words
The method of detecting nuclear resonance in a sample comprising the steps of subjecting the sample to a highly stable uni-directional magnetic field to polarize the nuclear spins, applying an alternating magnetic field to the sample at a frequency omega and varying said frequency from a first frequency below the resonant frequency of interest to above the resonant frequency of interest at a rate which provides adiabatic fast passage, and detecting the resultant change in magnetization parallel to the direction of the highly stable magnetic field.
Claim 13
Independent Claim
86 words
The method of detecting nuclear resonance in a sample comprising the steps of subjecting the sample to a highly stable uni-directional magnetic field to polarize the nuclear spins, applying an alternating magnetic field to the sample at a frequency omega and varying said frequency from a first frequency below the resonant frequency of interest to above the resonant frequency of interest at a rate which provides adiabatic fast passage, and detecting the resultant change in magnetization parallel to the direction of the highly stable magnetic field.
Claim 14
Dependent Claim
40 words
The method as in claim 11 wherein the nuclear spins are polarized in a first region, the sample is moved to a second region where it is subjected to the alternating magnetic field and detection of the change in magnetization.
Claim 15
Dependent Claim
58 words
The method as in claim 11 wherein the sample continuously moves through the apparatus and is subjected to a high magnetic field in one region of the apparatus for a predetermined time and selectively subjected to an adiabatic fast passage in said region and thereafter detected to detect the change in magnetization during said selected adiabatic fast passage.
References Cited (Backward Citations)
US3191119A
Cited
US3419794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |