GB985208A - Gyromagnetic resonance method and apparatus - Google Patents
Gyromagnetic resonance method and apparatusInfo
- Publication number
- GB985208A GB985208A GB34083/61A GB3408361A GB985208A GB 985208 A GB985208 A GB 985208A GB 34083/61 A GB34083/61 A GB 34083/61A GB 3408361 A GB3408361 A GB 3408361A GB 985208 A GB985208 A GB 985208A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- resonance
- field
- modulated
- audio output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000009774 resonance method Methods 0.000 title 1
- 230000003321 amplification Effects 0.000 abstract 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 2
- 238000001514 detection method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/26—Automatic control of frequency or phase; Synchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/389—Field stabilisation, e.g. by field measurements and control means or indirectly by current stabilisation
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Gyroscopes (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
985,208. Gyromagnetic resonance apparatus. VARIAN ASSOCIATES. Sept. 22, 1961 [Sept. 22, 1960], No. 34083/61. Addition to 939,258. Heading H3B. A gyromagnetic resonance oscillator comprises a sideband resonance system in which the driving radio-frequency magnetic field or the polarizing magnetic field is modulated at a frequency lower than the driving radio frequency to produce side-band resonance, the arrangement being made self-sustaining by selecting one of the frequencies produced and applying it in its correct sense after amplification and detection to effect the said modulation. The transmitter coil 28, Fig. 4, of a crossed coil system is energized by a signal of frequency or from an R.F. oscillator 27 through an attenuator 29, and the R.F. output (# ; #+# 1 , #+2 #1 ) (where # 1 is the modulating frequency), from coil 32 is, after amplification, mixed with oscillations from oscillator 27 in a mixer 34, a filter 35 being provided to select the modulating frequency. The selected frequency is applied to field modulating coil 38 through an audioamplifier 36 and a circuit 37, including a limiter to prevent saturation, the circuit serving to hold constant the amplitude of the resonance signal. A phase shifting network may be included. A single coil system is described with reference to Fig. 5 (not shown.) In an alternative arrangement, Fig. 7, the R.F. driving field is frequency modulated in a unit 56 by the audio output from the resonance system, the audio output being detected by an amplitude detector 61 and being applied also via a discriminator 69 and coils 67 to compensate for field drift. The F.M. signal is limited in a limiter 58 before application to the sample. In a modification of the arrangement of Fig. 7 described with reference to Fig. 8 (not shown), the driving field is amplitude modulated and frequency variation in the gyromagnetic output is detected by a discriminator to produce the modulating frequency. These two systems are insensitive to changes in R.F. gain or to transmitter/receiver coil unbalance. In a further single coil system, Fig. 9 (not shown), wherein the polarizing field is modulated by the audio output, the audio output is used also to control the magnetizing power supply, a frequency discriminator being included in the control circuit, and the arrangement serving to compensate for drift. A sideband resonance electron-paramagnetic oscillator in which the field through a cavity resonator containing the substance is modulated by the detected audio output from a bridge including the cavity in one arm, and energized by a klystron is described with reference to Fig. 10 (not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US5779360A | 1960-09-22 | 1960-09-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB985208A true GB985208A (en) | 1965-03-03 |
Family
ID=22012800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB34083/61A Expired GB985208A (en) | 1960-09-22 | 1961-09-22 | Gyromagnetic resonance method and apparatus |
Country Status (5)
Country | Link |
---|---|
CH (1) | CH419253A (en) |
DE (1) | DE1416453C3 (en) |
FR (1) | FR1397909A (en) |
GB (1) | GB985208A (en) |
NL (1) | NL269488A (en) |
-
0
- NL NL269488D patent/NL269488A/xx unknown
-
1961
- 1961-09-14 DE DE1416453A patent/DE1416453C3/en not_active Expired
- 1961-09-22 GB GB34083/61A patent/GB985208A/en not_active Expired
- 1961-09-22 CH CH1107961A patent/CH419253A/en unknown
- 1961-09-22 FR FR873916A patent/FR1397909A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1397909A (en) | 1965-05-07 |
CH419253A (en) | 1966-08-31 |
DE1416453C3 (en) | 1975-02-13 |
NL269488A (en) | |
DE1416453A1 (en) | 1968-10-03 |
DE1416453B2 (en) | 1972-08-03 |
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