GB901829A - Improvements relating to nuclear magnetic resonance apparatus - Google Patents
Improvements relating to nuclear magnetic resonance apparatusInfo
- Publication number
- GB901829A GB901829A GB20902/58A GB2090258A GB901829A GB 901829 A GB901829 A GB 901829A GB 20902/58 A GB20902/58 A GB 20902/58A GB 2090258 A GB2090258 A GB 2090258A GB 901829 A GB901829 A GB 901829A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- generator
- coil
- tuned
- coupled
- 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
Classifications
-
- 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
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3628—Tuning/matching of the transmit/receive coil
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/261—Amplifier which being suitable for instrumentation applications
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
901,829. Nuclear resonance-testing apparatus. FAIREY CO. Ltd. Oct. 14, 1958 [June 30, 1958], No. 20902/58. Class 37. A nuclear magnetic resonance detector comprises a test coil in a transverse magnetic field and adapted to receive a test specimen the test coil being coupled to a radio frequency generator and forming part of a tuned circuit in a feed-back loop which increase the effective Q of the tuned circuit. In Fig. 1, a specimen 11 is inserted in a coil 10 located in the field of a magnet 12 and coupled to a R.F. generator circuit 13. The coil being tuned by capacitors 18 and 19 and coupled to a detector circuit 20, 40, 41, 42, 43. The magnetizing current of the magnet 12 is varied in saw-tooth fashion by means of a generator 16 so that the nuclear resonance frequency is varied through a range which includes the frequency of an R.F. generator. When the two frequencies are the same, energy is absorbed from the R.F. generator 13 and a corresponding indication is obtained in the meter 43 or a cathode-ray tube circuit connected in its place. The tuned circuit 10, 18, 19 is connected to the valve 20, in Colpitts fashion so as to provide positive feed-back and so increase the effective Q of the circuit and the sensitivity of the apparatus. A negative feed-back resistor 24 is provided to stabilize the circuit and this is adjustable to enable the gain to be set to a value just below that which causes the circuit to oscillate. In an alternative circuit (Fig. 3, not shown), the adjustment is effected by varying the screen potential of valve 20. The Specification also describes a circuit as disclosed in Specification 901,827 in which a different method of detecting nuclear resonance is used, the detector coil being connected in a circuit similar to Fig. 1 (Fig. 2, not shown). The radiofrequency generator may be crystal-controlled and may provide a harmonic series of frequencies so that a single crystal may be used to cover a wide frequency range, interpolation between the harmonics being effected by a magnetic shunt, as described in. Specification 901,828.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB20902/58A GB901829A (en) | 1958-06-30 | 1958-06-30 | Improvements relating to nuclear magnetic resonance apparatus |
FR777045A FR1220024A (en) | 1958-06-30 | 1958-10-20 | Improvements to nuclear magnetic resonance detectors |
CH359299D CH359299A (en) | 1958-06-30 | 1958-10-21 | Nuclear magnetic resonance detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB20902/58A GB901829A (en) | 1958-06-30 | 1958-06-30 | Improvements relating to nuclear magnetic resonance apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB901829A true GB901829A (en) | 1962-07-25 |
Family
ID=10153711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20902/58A Expired GB901829A (en) | 1958-06-30 | 1958-06-30 | Improvements relating to nuclear magnetic resonance apparatus |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH359299A (en) |
FR (1) | FR1220024A (en) |
GB (1) | GB901829A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100372501C (en) * | 2005-07-11 | 2008-03-05 | 华东师范大学 | Testing method for magnetic resonance imaging system |
-
1958
- 1958-06-30 GB GB20902/58A patent/GB901829A/en not_active Expired
- 1958-10-20 FR FR777045A patent/FR1220024A/en not_active Expired
- 1958-10-21 CH CH359299D patent/CH359299A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100372501C (en) * | 2005-07-11 | 2008-03-05 | 华东师范大学 | Testing method for magnetic resonance imaging system |
Also Published As
Publication number | Publication date |
---|---|
FR1220024A (en) | 1960-05-20 |
CH359299A (en) | 1961-12-31 |
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