WO1994006029A1 - Procede de mesure de l'induction d'un champ magnetique - Google Patents
Procede de mesure de l'induction d'un champ magnetique Download PDFInfo
- Publication number
- WO1994006029A1 WO1994006029A1 PCT/RU1992/000124 RU9200124W WO9406029A1 WO 1994006029 A1 WO1994006029 A1 WO 1994006029A1 RU 9200124 W RU9200124 W RU 9200124W WO 9406029 A1 WO9406029 A1 WO 9406029A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ποlya
- field
- ποle
- variable
- frequency
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
Definitions
- the invention is subject to the scope of magnetic measurements and may be used to measure a fixed, variable and pulsed high frequency.
- the invention may be used for exploration and exploitation of useful minerals, in automatic systems, in the medical and medical sciences, for the study of medicine
- the signal in the second harmonic is allocated by a narrow amplifier and a sync detector. 0 value of the field is judged on the basis of measuring the voltage at the output of the synchronous detector ⁇ ⁇ -mule & -? . . where & is the induction of a magnetic field, ⁇ is the conversion factor / I /.
- the disadvantages of this method are: a narrow frequency range of the variable fields, a low koe- coefficient of conversion, temporary instability, significant high-noise.
- the purpose iz ⁇ b ⁇ e ⁇ eniya yavlyae ⁇ sya increase ⁇ chn ⁇ s ⁇ i izme ⁇ e- Nij and ⁇ asshi ⁇ eniya chas ⁇ n ⁇ g ⁇ dia ⁇ az ⁇ na izme ⁇ yaem ⁇ g ⁇ magni ⁇ n ⁇ g ⁇ ⁇ lya ⁇ u ⁇ em ⁇ lucheniya uz ⁇ y line magni ⁇ n ⁇ g ⁇ ⁇ ez ⁇ nansa in weak b ⁇ m ⁇ s ⁇ yann ⁇ m magni ⁇ n ⁇ m ⁇ le and vys ⁇ g ⁇ ⁇ e ⁇ itsien ⁇ a ⁇ e ⁇ b- ⁇ az ⁇ vaniya in shi ⁇ m dia ⁇ az ⁇ e chas ⁇ ,
- the goal is achieved in that a magnetic core in the form of a plate with a small negative force and with a low value of saturation induction is placed in a large volume . And is induction of the heartland greater than 3? . It receives a variable high-frequency magnetic field at the center with a constant frequency of the magnetic resonance and a non-return line.
- the Fig. ⁇ / 3 shows the sharpest: I - dependence ⁇ from 8, 2 - line of the magnetic resonance, 3 - direct response of the resonance.
- the inconsistent frequency depends on the measured field and field anisotropy of the core and is 16-25 MHz.
- the diagnostic response may be obtained from the user in a regular manner, as well as in the event that it is not necessary to
- the width at the highest resonance line for some amorphous alloys is between 500-2000 nl. This allows you to get high sensitivity and low error in setting the moment of resonance based on the expression:
- ⁇ ⁇ _ is the width of the line of the magnetic resonance
- s is the noise voltage
- & 0 is the constant field input
- & ** is the amplitude of the induction field for the modulation
- £ ⁇ is the signal voltage.
- Fig. 2/3 shows the changes in the permanent field in the rings of Helmholtz by 0.01 nl with a constant registration time of 2 s. It is obvious that the signal increases noise by 10-15 times, i.e. Selling sensitivity is 1-2 times. Variable voltage is measured in the range of 1-2.10 Hz with a threshold sensitivity of I or less.
- the figure 3/3 shows the scheme ... of the implementation of the related method: I - source of continuous voltage; 2 - digital analyzer; 3 - modulation signal generation; 4 - amount ⁇ ; 5 - feedback communication toolkit; 6 - ferromagnetic core; 7 - bailer of the car; 8 - one; 9 - sync detector; 10 - DEVICES FOR OPERATING CONTROL; II - ⁇ igge ⁇ ; 12,13 - key devices; 14 - logical level; 15 - a recessive counter of impulses; 16 - integrate; 17 - frequency; 18 - filter of the upper part; 19 - exit to the open field; 20 - exit at a variable field; 21 - reset button; 22 - operating mode switch.
- the source of heavy voltage I has two outputs with different values of heavy voltage.
- the first exit is connected to the non-investing input of the integrator 16, the second - to the output of the voltage ⁇ -2.
- the digital inputs of ⁇ -2 are connected to the outputs of the reverse pulse counter 15, by a / 7-single bus.
- the output of the CPU-2 and the output of the modulation signal generator 3 are connected to the outputs of the sum 4. Switching the switch 21 to the operating mode changes the voltage (is unused)
- a further use of this circuit breaker is in accordance with the variable magnetic field.
- ⁇ ab ⁇ a us ⁇ ys ⁇ va of ⁇ ezhime izme ⁇ eniya ⁇ e ⁇ emenn ⁇ g ⁇ magni ⁇ - n ⁇ g ⁇ ⁇ lya za ⁇ lyuchae ⁇ sya in ⁇ m
- ch ⁇ is ⁇ chni ⁇ m ⁇ n ⁇ g ⁇ na ⁇ yazhe- Nia I and ⁇ m in ⁇ eg ⁇ a ⁇ a 16 ⁇ a ⁇ ush ⁇ e ⁇ b ⁇ a ⁇ n ⁇ y connection 5 us ⁇ a- navlivae ⁇ sya ⁇ , s ⁇ zdayuschy ⁇ s ⁇ yann ⁇ e magni ⁇ n ⁇ e ⁇ le s ⁇ ve ⁇ - s ⁇ vuyuschee naib ⁇ lshey ⁇ u ⁇ izne / 1 ⁇ (&) heart 6 »Variable field does not affect the indus- trial and accessory of the car 7 of the auto-converter of the car. There is modulation of the generation of autodyne
- the operation of the device in the mode of measuring a fixed field starts with the button of reset. With this ⁇ SI- ⁇ 5 and trigger II, they are set to the zero position. Key 12 and the counting pulses are sent to the operational input SSI-5. The signal level at the output of the inputs & the logical level of 14 is compliant with the SSI- ⁇ 5 summation mode. The linear increase in voltage at the output of the ⁇ -2 reaches the level, and at the analogous output of the driver 8 there is a positive signal output frequency. Changing the voltage level at the output of the synchro- nous detector 9 leads to the operation of the circuit for connecting 10 to the output connected to the II circuit.
- SEX has a cutoff frequency above the modulation frequency.
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
L'invention concerne les mesures magnétiques et peut être utilisée pour mesurer un champ magnétique statique, variable et pulsé avec une précision élevée. Le procédé consiste à effectuer une excitation par résonance magnétique dans un noyau ferromagnétique à l'aide d'un champ variable, à une fréquence égale à la fréquence de résonance du champ statique, l'induction dépassant l'induction de saturation du noyau, après quoi on obtient une courbe de résonance, on module un champ statique à l'aide d'une fréquence inférieure à la fréquence de résonance, on obtient la dérivé de la courbe de résonance, on mesure la fréquence de résonance et on détermine la valeur du champ statique au moyen de la formule: B1 = K1 f0. On procéde à la mesure du champ variable et pulsé en fonction de la perméabilité du noyau dans le champ magnétique, et on détermine la valeur du champ au moyen de la formule: B2 = K2 U.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/RU1992/000124 WO1994006029A1 (fr) | 1992-06-25 | 1992-06-25 | Procede de mesure de l'induction d'un champ magnetique |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/RU1992/000124 WO1994006029A1 (fr) | 1992-06-25 | 1992-06-25 | Procede de mesure de l'induction d'un champ magnetique |
Publications (1)
Publication Number | Publication Date |
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WO1994006029A1 true WO1994006029A1 (fr) | 1994-03-17 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/RU1992/000124 WO1994006029A1 (fr) | 1992-06-25 | 1992-06-25 | Procede de mesure de l'induction d'un champ magnetique |
Country Status (1)
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WO (1) | WO1994006029A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2810754A1 (fr) | 2000-06-22 | 2001-12-28 | Guy Ferrand | Dispositif de securite annulant l'effet de traction mecanique lineaire, par rupture en un point de la ligne de traction, par un principe de repulsion de champ magnetique |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU828133A1 (ru) * | 1979-07-10 | 1981-05-07 | Предприятие П/Я А-1742 | Способ измерени магнитной индукции |
SU832501A1 (ru) * | 1979-03-27 | 1981-05-23 | Предприятие П/Я А-1742 | Способ возбуждени феррозонда |
EP0256659A1 (fr) * | 1986-07-31 | 1988-02-24 | Security Tag Systems, Inc. | Détection de la variation du champ magnétique d'un courant continu |
-
1992
- 1992-06-25 WO PCT/RU1992/000124 patent/WO1994006029A1/fr active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU832501A1 (ru) * | 1979-03-27 | 1981-05-23 | Предприятие П/Я А-1742 | Способ возбуждени феррозонда |
SU828133A1 (ru) * | 1979-07-10 | 1981-05-07 | Предприятие П/Я А-1742 | Способ измерени магнитной индукции |
EP0256659A1 (fr) * | 1986-07-31 | 1988-02-24 | Security Tag Systems, Inc. | Détection de la variation du champ magnétique d'un courant continu |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2810754A1 (fr) | 2000-06-22 | 2001-12-28 | Guy Ferrand | Dispositif de securite annulant l'effet de traction mecanique lineaire, par rupture en un point de la ligne de traction, par un principe de repulsion de champ magnetique |
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