WO2000049422A1 - Fluxgate sensor with racetrack core - Google Patents
Fluxgate sensor with racetrack core Download PDFInfo
- Publication number
- WO2000049422A1 WO2000049422A1 PCT/CZ2000/000005 CZ0000005W WO0049422A1 WO 2000049422 A1 WO2000049422 A1 WO 2000049422A1 CZ 0000005 W CZ0000005 W CZ 0000005W WO 0049422 A1 WO0049422 A1 WO 0049422A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- core
- pick
- racetrack
- cross
- sensor
- Prior art date
Links
- 230000005284 excitation Effects 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 4
- 230000005291 magnetic effect Effects 0.000 description 8
- 238000005259 measurement Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
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
- G01R33/04—Measuring direction or magnitude of magnetic fields or magnetic flux using the flux-gate principle
- G01R33/045—Measuring direction or magnitude of magnetic fields or magnetic flux using the flux-gate principle in single-, or multi-aperture elements
Definitions
- This invention relates to fluxgate sensor with racetrack (oval) core, which is intended for precise measurement of weak magnetic fields.
- Fluxgate sensors are used for measurement of weak magnetic fields in geophysics, medical diagnostics, navigation, and for contactless measurement of electrical currents. Their military application, e.g. for location of unexploded ammunition and bombs, detection of vehicles and guidance of projectiles, is also important. Fluxgate sensors with ring core are the most commonly used ones, fluxgate sensors with racetrack core are used less often.
- the main disadvantage of the fluxgate sensors with ring core is their small sensitivity and small resistance against the influence of the pe ⁇ endicular magnetic field.
- fluxgate sensor with racetrack core which consists of the core with fixed excitation winding and of the pick-up coil.
- the nature of this fluxgate sensor is that the cross-sectional area of at least one of the tracks (arms) of the racetrack core in the pe ⁇ endicular direction to the core longitudinal axis is variable along the length of the mentioned at least one track. In one possible embodiment the cross-sectional area of the individual tracks is increasing in opposite directions. It is advantageous when the pick-up coil is slidably mounted on the racetrack core with excitation winding.
- the advantage of the mentioned setup is that the magnetic circuit of the core has cross- sectional area variable along its length, so that the balance of both the core tracks can be changed by sliding the pick-up coil with respect to the core.
- the position of the pick-up coil corresponding to the best balance of the sensor, i.e. minimum spurious voltage at the output, can be found by means of the mentioned sliding.
- the pick-up coil is then usually fixed in this position.
- the magnetic core of the fluxgate sensor in accordance with the given example has a shape similar to a acetrack, but the width of its tracks I and 2 is slightly changing along the length. While in one direction one of the tracks , 2 is getting wider, the second one is getting narrower.
- the fixed excitation winding which is for clarity not shown in the figure, is positioned in the usual way on the mentioned racetrack core; the pick-up coil 3 is wound over the excitation winding. In one of the preferred embodiment the pick-up coil 3 is made slidable.
- the ratio of effective cross-sections of the core tracks and 2 with respect to the pick-up coil 3 is changing by sliding of the pick-up coil 3; in this way the magnetic symmetry of the fluxgate sensor is adjusted.
- the balance of the two tracks l_and 2 is changing.
- the position corresponding to the best balance of the fluxgate sensor can be found by this way, and the pick-up coil can be fixed in this position.
- the pick-up coil 3 need not to be fixed to be fully_movable, but it is enough to mount it with leaving it the certain degree of freedom in movement in order to enable eventual further balancing.
- Another possibility, how to balance the fluxgate sensor is to change the geometry of the pick-up coil 3 by adding or removing a certain number of turns, eventually by changing the position or location of some turns while preserving their original number.
- the whole process of balancing is performed during the production phase of the fluxgate sensor.
- Fluxgate sensor with racetrack core can be used for example for measurement of weak magnetic fields in navigation, location of ferromagnetic bodies, or for contactless measurement of electric currents.
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CZPV528-99 | 1999-02-17 | ||
| CZ1999528A CZ52899A3 (cs) | 1999-02-17 | 1999-02-17 | Feromagnetická sonda s oválným jádrem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000049422A1 true WO2000049422A1 (en) | 2000-08-24 |
Family
ID=5461863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CZ2000/000005 WO2000049422A1 (en) | 1999-02-17 | 2000-02-10 | Fluxgate sensor with racetrack core |
Country Status (2)
| Country | Link |
|---|---|
| CZ (1) | CZ52899A3 (cs) |
| WO (1) | WO2000049422A1 (cs) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ301546B6 (cs) * | 2005-07-07 | 2010-04-14 | Ceské vysoké ucení technické v Praze, Fakulta elektrotechnická | Feromagnetická sonda |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270648A (en) * | 1990-08-10 | 1993-12-14 | Watson Industries, Inc. | Single core triaxial flux-gate magnetometer |
-
1999
- 1999-02-17 CZ CZ1999528A patent/CZ52899A3/cs not_active IP Right Cessation
-
2000
- 2000-02-10 WO PCT/CZ2000/000005 patent/WO2000049422A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270648A (en) * | 1990-08-10 | 1993-12-14 | Watson Industries, Inc. | Single core triaxial flux-gate magnetometer |
Non-Patent Citations (3)
| Title |
|---|
| HAUSER H ET AL: "FLUXGATE-SENSOREN: FUNKTIONSWEISE, BAUFORMEN, WERKSTOFFE FLUXGATE SENSORS: PRINCIPLE, GEOMETRY, MATERIALS", TECHNISCHES MESSEN TM,DE,R.OLDENBOURG VERLAG. MUNCHEN, vol. 61, no. 6, 1 June 1994 (1994-06-01), pages 235 - 247, XP000456303, ISSN: 0171-8096 * |
| PRIMDAHL F ET AL: "THE SENSITIVITY PARAMETERS OF THE SHORT-CIRCUITED FLUXGATE", MEASUREMENT SCIENCE AND TECHNOLOGY,GB,IOP PUBLISHING, BRISTOL, vol. 2, no. 11, 1 November 1991 (1991-11-01), pages 1039 - 1045, XP000266515, ISSN: 0957-0233 * |
| RIPKA P: "RACE-TRACK FLUXGATE SENSORS", SENSORS AND ACTUATORS A,CH,ELSEVIER SEQUOIA S.A., LAUSANNE, vol. A37-A38, 1 June 1993 (1993-06-01), pages 417 - 421, XP000411421, ISSN: 0924-4247 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CZ286657B6 (cs) | 2000-05-17 |
| CZ52899A3 (cs) | 2000-05-17 |
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