IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0700921
(2011-05-26)
|
등록번호 |
US-8590396
(2013-11-26)
|
우선권정보 |
FR-10 54250 (2010-06-01) |
국제출원번호 |
PCT/EP2011/058683
(2011-05-26)
|
§371/§102 date |
20130211
(20130211)
|
국제공개번호 |
WO2011/151257
(2011-12-08)
|
발명자
/ 주소 |
- Pinton, Jean-Francois
- Plihon, Nicolas
- Verhille, Gautier
- Miralles, Sophie
|
출원인 / 주소 |
- Ecole Normale Superieure de Lyon
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
5 |
초록
▼
This velocimeter for measuring the speed of flow of an electrically conducting fluid comprises: —two sensors (16, 19) disposed in such a way that, in the absence of flow of the electrically conducting fluid (4), the difference between the current strengths measured by the two sensors (16, 19) is non
This velocimeter for measuring the speed of flow of an electrically conducting fluid comprises: —two sensors (16, 19) disposed in such a way that, in the absence of flow of the electrically conducting fluid (4), the difference between the current strengths measured by the two sensors (16, 19) is non zero, —a processing unit (18) is able to calculate the speed of flow of the fluid in a direction parallel to the first measurement direction (7) on the basis of the difference between the current strengths measured by the two sensors (16, 19).
대표청구항
▼
1. An apparatus for measuring flow speed of an electrically conducting fluid, said apparatus comprising a velocimeter, wherein said velocimeter comprises a source of a primary magnetic field, said primary magnetic field having field lines that pass through said electrically conducting fluid, first a
1. An apparatus for measuring flow speed of an electrically conducting fluid, said apparatus comprising a velocimeter, wherein said velocimeter comprises a source of a primary magnetic field, said primary magnetic field having field lines that pass through said electrically conducting fluid, first and second magnetic field sensors, each of which measures corresponding first and second intensities of said magnetic field in a first measurement direction, said first and second magnetic field sensors being disposed such that, in absence of flow of said electrically conducting fluid, a difference between said first and second intensities is non-zero, and a processing unit adapted to calculate, based at least in part on said difference, a flow speed of said electrically conducting fluid in a direction parallel to said first measurement direction. 2. The apparatus of claim 1, wherein said first and second magnetic field sensors are disposed such that, in absence of flow of said electrically conducting fluid, said difference between said first and second intensities is greater than the smaller of said first and second intensities. 3. The apparatus of claim 1, wherein said source has a magnetization axis, and wherein said first and second magnetic field sensors are disposed on the same side of a plane containing said magnetization axis. 4. The apparatus of claim 1, wherein said first magnetic field sensor is situated at a first distance from said source and said second magnetic field sensor is situated at a second distance from said source, and wherein an absolute value of a difference between said first and second distances is greater than the smaller of said first and second distances. 5. The apparatus of claim 1, further comprising a magnetic disturber disposed closer to said first magnetic field sensor than to said second magnetic field sensor so that, in the absence of flow of said electrically conducting fluid, said first intensity is at least double said second intensity. 6. The apparatus of claim 5, wherein said first and second magnetic field sensors are equidistant from said source. 7. The apparatus of claim 1, wherein said velocimeter comprises a third magnetic field sensor, said third magnetic field sensor being adapted to measure a magnetic field in said first measurement direction, said third magnetic field sensor being disposed relative to said source so that intensities measured by said first magnetic field sensor and said third magnetic field sensor are equal in the absence of flow, and wherein said processing unit is adapted to calculate a speed of flow of said electrically conducting fluid based at least in part on a sum of a first difference and a second difference, said first difference being a difference between intensities measured by said first and second magnetic field sensors, and said second difference being a difference between intensities measured by said second and third magnetic field sensors. 8. The apparatus of claim 7, wherein said velocimeter comprises a fourth magnetic field sensor and a fifth magnetic field sensor for measuring an intensity of said magnetic field in at least one second measurement direction intersecting said first measurement direction, and wherein said processing unit is adapted to calculate a speed of flow of said electrically conducting fluid in said second measurement direction of said fourth and fifth magnetic field sensors based at least in part on a difference between intensities measured by said fourth and fifth magnetic field sensors. 9. The apparatus of claim 1, wherein said source comprises an alternating magnetic field source. 10. The apparatus of claim 1, wherein said primary magnetic field is modulated by a predetermined modulating signal and wherein said intensities measured by said magnetic field sensors are demodulated with the aid of said predetermined modulating signal. 11. A method of measuring the speed of flow of an electrically conducting fluid through which field lines of a primary magnetic field pass, said method comprising measuring an intensity of said magnetic field in a first measurement direction using first and second magnetic field sensors disposed so that, in absence of flow of said electrically conducting fluid, a difference between intensities measured by said first and second magnetic field sensors is non-zero, and calculating a speed of flow from a difference between said intensities measured by said first and second magnetic field sensors.
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