Patent US3725773A successfully refreshed from Google Patents.
US3725773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
An rf spectrometer having means for exciting rf resonance of a plurality of resonance lines simultaneously using a high speed scanning means
Assignee: Varian Medical Systems Inc
•
Filing: 1971-04-19
•
Granted: 1973-04-03
•
Expires: 1991-04-19
Abstract
Abstract In a Fourier transform spectrometer the sample is immersed in a polarizing magnetic field of intensity H0 and is irradiated with radio frequency energy of a frequency omega . The ratio of omega to H0 is rapidly and repetitively scanned over a range of values to repetitively excite resonance of a plurality of resonance lines within the sample. The scanning repetition frequency is sufficiently high to sustain simultaneous resonance of the plurality of excited resonance lines. A signal representative of the composite resonance signal emanating from the sample and containing the plurality of simultaneous excited signals is complex multiplied by a signal representative of said scan frequency.
Inventors
- 👤 F Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:48
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/46
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
224 words
In a radio frequency spectrometer, means for exciting radio frequency resonance of a plurality of resonance lines simultaneously in a sample of matter under investigation immersed in a polarizing magnetic field H0 to produce a composite resonance line signal, means for receiving the composite resonance line signal emanating from the sample and containing the simultaneously excited plural resonance line signals within the sample of matter under analysis, the improvement wherein, said means for exciting radio frequency resonance of the plural resonance line simultaneously includes, means for irradiating the sample in the poLarizing magnetic field with radio frequency energy of a frequency omega which is related to the intensity H0 of the polarizing magnetic field such that the ratio of omega /H0 is a value to excite resonance of the resonance lines, means for repetitively scanning the ratio of omega /H0 over a range of values to initially excite each said resonance line at a different time, said means for scanning having a scanning rate sufficiently high to excite simultaneous resonance of the plural resonance lines within the scanned range of values for the ratio omega /H0, and computer means, said computer means connected to said receiver means, said computer means including means for time-averaging and means for separating the individual resonance lines within the spectrum under analysis and means for displaying said separated lines.
Claim 2
Dependent Claim
224 words
In a radio frequency spectrometer, means for exciting radio frequency resonance of a plurality of resonance lines simultaneously in a sample of matter under investigation immersed in a polarizing magnetic field H0 to produce a composite resonance line signal, means for receiving the composite resonance line signal emanating from the sample and containing the simultaneously excited plural resonance line signals within the sample of matter under analysis, the improvement wherein, said means for exciting radio frequency resonance of the plural resonance line simultaneously includes, means for irradiating the sample in the poLarizing magnetic field with radio frequency energy of a frequency omega which is related to the intensity H0 of the polarizing magnetic field such that the ratio of omega /H0 is a value to excite resonance of the resonance lines, means for repetitively scanning the ratio of omega /H0 over a range of values to initially excite each said resonance line at a different time, said means for scanning having a scanning rate sufficiently high to excite simultaneous resonance of the plural resonance lines within the scanned range of values for the ratio omega /H0, and computer means, said computer means connected to said receiver means, said computer means including means for time-averaging and means for separating the individual resonance lines within the spectrum under analysis and means for displaying said separated lines.
Claim 3
Dependent Claim
34 words
The apparatus of claim 1 wherein said scanning means repetitively scans said ratio of omega /H0 at a repetition rate sufficiently high to sustain simultaneous resonance of the plural resonance lines between successive scans.
Claim 4
Dependent Claim
29 words
The apparatus of claim 1 wherein said means for repetitively scanning the ratio of omega /H0 includes, means for repetitively scanning the frequency omega of the radio frequency energy.
Claim 5
Dependent Claim
29 words
The apparatus of claim 1 wherein said means for repetitively scanning the ratio of omega /H0 includes, means for repetitively scanning the intensity H0 of the polarizing magnetic field.
Claim 6
Dependent Claim
27 words
The apparatus of claim 1 wherein said means for separating includes, first means for Fourier analyzing the received composite resonance signal, said first means having an output.
Claim 7
Dependent Claim
62 words
The apparatus of claim 5 wherein said means for separating further including a second means for Fourier analyzing a signal responsive to said means for repetitively scanning the ratio of omega /H0, said second means having an output, and a complex multiplier for complex multiplying the output of said first Fourier analyzer means times said output of said second Fourier analyzer means.
Claim 8
Dependent Claim
44 words
The apparatus of claim 1 wherein said means for separating comprises a cross-correlator coupled to said receiver and to a signal responsive to said means for repetitively scanning the ratio of omega /Ho for cross-correlating said received composite resonant signal with said scanning signal.
Claim 9
Dependent Claim
199 words
In a method for deriving a resonance spectrum of a sample under analysis the steps of, exciting radio frequency resonance of a plurality of resonance lines simultaneously in the sample of matter under investigation immersed in a polarizing magnetic field H0 to produce a composite resonance line signal, receiving the composite resonance signal emanating from the sample and containing the simultaneously excited plural resonance line signal within the sample of matter under analysis, the improvement wherein, said step of exciting radio frequency resonance of the plural resonance lines simultaneously includes the step of, irradiating the sample in the polarizing magnetic field with radio frequency energy of a frequency omega which is related to the intensity H0 of the polarizing magnetic field such that the ratio of omega /H0 is scanned over a range of values with a scanning rate high enough to excite simultaneous resonance of the plural resonance line within the scanned range of values for the ratio of omega /H0, and wherein the step of receiving the composite resonance line signal includes the step of, time-averaging and separating the individual resonance lines from the composite resonance line signal to obtain a spectrum of the sample under analysis.
Claim 10
Dependent Claim
199 words
In a method for deriving a resonance spectrum of a sample under analysis the steps of, exciting radio frequency resonance of a plurality of resonance lines simultaneously in the sample of matter under investigation immersed in a polarizing magnetic field H0 to produce a composite resonance line signal, receiving the composite resonance signal emanating from the sample and containing the simultaneously excited plural resonance line signal within the sample of matter under analysis, the improvement wherein, said step of exciting radio frequency resonance of the plural resonance lines simultaneously includes the step of, irradiating the sample in the polarizing magnetic field with radio frequency energy of a frequency omega which is related to the intensity H0 of the polarizing magnetic field such that the ratio of omega /H0 is scanned over a range of values with a scanning rate high enough to excite simultaneous resonance of the plural resonance line within the scanned range of values for the ratio of omega /H0, and wherein the step of receiving the composite resonance line signal includes the step of, time-averaging and separating the individual resonance lines from the composite resonance line signal to obtain a spectrum of the sample under analysis.
Claim 11
Dependent Claim
39 words
The method of claim 8 wherein the step of repetitively scanning the ratio of omega /H0 includes the step of, scanning with a repetition rate sufficiently high to sustain simultaneous resonance of the plural resonance lines between successive scans.
Claim 12
Dependent Claim
30 words
The method of claim 8 wherein the step of repetitively scAnning the ratio of omega /H0 includes the step of, repetitively scanning the frequency omega of the radio frequency energy.
Claim 13
Dependent Claim
30 words
The method of claim 8 wherein the step of repetitively scanning the ratio of omega /H0 includes the step of, repetitively scanning the intensity H0 of the polarizing magnetic field.
Claim 14
Dependent Claim
41 words
The method of claim 8 wherein the inverse of the scanning repetition frequency is less than three times the characteristic transverse relaxation time T2 of the resonance lines being excited, whereby simultaneous resonance is sustained of the plural excited resonance lines.
Claim 15
Dependent Claim
40 words
The method of claim 8 wherein the step of receiving the composite resonance line signal includes the step of, complex multiplying a signal representative of said composite resonant line signal times a signal representative of said scanned ratio omega /Ho.
References Cited (Backward Citations)
US3475680A
Cited
US3461381A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |