Magnetic inductive flow measurement device and method with reduced electrochemical interference voltage
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01F-001/58
G01F-001/60
출원번호
US-0896200
(2014-06-04)
등록번호
US-10151609
(2018-12-11)
우선권정보
DE-10 2013 105 832 (2013-06-06)
국제출원번호
PCT/EP2014/061534
(2014-06-04)
국제공개번호
WO2014/195338
(2014-12-11)
발명자
/ 주소
Wolff, Marcus
Buhns, Henry
출원인 / 주소
EICON GmbH
대리인 / 주소
Stein IP, LLC
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
The invention relates to a measuring device for measuring a flow rate of an electrically conducting medium in a volume which is permeated by a magnetic field, comprising a device for producing the magnetic field, at least one resistor, at least two electrodes, the at least two electrodes being elect
The invention relates to a measuring device for measuring a flow rate of an electrically conducting medium in a volume which is permeated by a magnetic field, comprising a device for producing the magnetic field, at least one resistor, at least two electrodes, the at least two electrodes being electrically interconnected via the at least one resistor, and an evaluation unit for evaluating the measurement signal of the electrodes measured in parallel to the at least one resistor, and for calculating the flow rate.
대표청구항▼
1. A measuring device for measuring a flow rate of an electrically conductive medium inside a measuring tube and permeated by a magnetic field, comprising: at least one permanent magnet to generate the magnetic field;at least one electrical resistor;at least two electrodes situated inside the measur
1. A measuring device for measuring a flow rate of an electrically conductive medium inside a measuring tube and permeated by a magnetic field, comprising: at least one permanent magnet to generate the magnetic field;at least one electrical resistor;at least two electrodes situated inside the measuring tube and electrically connected to each other via the at least one electrical resistor and providing a measurement signal; andan evaluation unit to evaluate the measurement signal from the electrodes which is measured in parallel to the at least one resistor to calculate the flow rate. 2. The measuring device as claimed in claim 1, wherein the least one resistor has a value of 10 to 200 kohm. 3. The measuring device as claimed in claim 1, wherein the evaluation unit comprises a recording device which records a temporal profile of the measurement signal. 4. The measuring device as claimed in claim 3, wherein the evaluation of the flow rate by the evaluation unit is based on the fact that temporal profiles of voltage induced by the flow and of electrochemical interference voltage differ. 5. The measuring device as claimed in claim 4, wherein the evaluation unit comprises a measuring circuit which selectively records a proportion of the voltage induced by the flow to the recording device. 6. The measuring device as claimed in claim 1, wherein a line which conducts the medium is grounded. 7. The measuring device as claimed in claim 1, further comprising a battery to provide an operating voltage. 8. The measuring device as claimed in claim 1, wherein the electrodes are formed in at least one of sections and at least partially, from at least one of: an inert material or are coated with the material;an electrically conductive polymer;electrically conductive ceramic; andcarbon nanotubes. 9. A measuring method to measure a flow rate of an electrically conductive medium in a volume permeated by a magnetic field, using the measuring device as claimed in claim 1, comprising: generating the magnetic field;measuring the measurement signal parallel to the at least one electrical resistor; andevaluating the measured measurement signal in order to determine the flow rate. 10. The measuring method as claimed in claim 9, wherein the at least two electrodes are in direct contact with the electrically conductive medium. 11. The measuring method as claimed in claim 9, wherein the magnetic field is generated by at least one permanent magnet. 12. The measuring method as claimed in claim 9, wherein: the at least two electrodes are connected, in addition and parallel to the resistor connection, to a switch which is designed to short-circuit the electrodes; the switch in the open state has a resistance of at least 10 Gohm; and/orthe switch in the switched-on state has a resistance of at most 1 ohm. 13. The measuring method as claimed in claim 12, wherein: the open and short-circuit times of the switch are controlled; the switch is short-circuited for a first period and then opened for a second period for measuring, the first period comprising to 200 ms and the second period comprising 1 to 40 ms. 14. The measuring method as claimed in claim 13, further comprising recording a temporal profile of the measurement signal. 15. The measuring method as claimed in claim 14, the evaluating of the flow rate is based on the fact that temporal profiles of a voltage induced by the flow and of an electrochemical interference voltage differ. 16. The measuring method as claimed in claim 15, wherein a line which conducts the medium is grounded. 17. The measuring method as claimed in claim 16, further comprising providing an operating voltage using a battery. 18. The measuring method as claimed in claim 17, wherein the electrodes are formed in at least one of sections and partially, from at least one of: an inert material, or are coated with the material;an electrically conductive polymer;an electrically conductive ceramic; and carbon nanotubes. 19. The measuring device according to claim 1, wherein the at least one permanent magnet comprises a pair of permanent magnets positioned such that an imaginary line between the pair of permanent magnets is parallel to the flow direction. 20. The measuring device according to claim 1, wherein the at least one permanent magnet is situated in the measuring tube and comprises a pair of permanent magnets positioned such that an imaginary line between the pair of permanent magnets is parallel to the flow direction. 21. The measuring device according to claim 1, wherein the at least one resistor is a permanent resistor. 22. A measuring device for measuring a flow rate of an electrically conductive medium in a volume permeated by a magnetic field, comprising: at least one permanent magnet to generate the magnetic field,at least one electrical resistor;at least two electrodes electrically connected via the at least one electrical resistor; andan evaluation unit to evaluate a measurement signal from the electrodes and which is measured parallel to the at least one resistor to calculate the flow rate; a switch to provide a second electrical connection to short-circuit the at least two electrodes, the second electrical connection being formed in addition and parallel to the first electrical connection of the at least one electrical resistor; wherein:the switch in at least one of: the open state has a resistance of at least 10 Gohm; andin the switched-on state has a resistance of at most 1 ohm. 23. The measuring device as claimed in claim 22, wherein the evaluation unit comprises a timer to control open and short-circuit times of the switch, wherein the timer short-circuits the switch for a first period of 40 to 200 ms and then opens the switch for a second period of 1 to 40 ms to measure.
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이 특허에 인용된 특허 (10)
Thorn Gernot (Hanau DEX), Apparatus and process for the non-destructive measurement of the ohmic resistance of a thin layer using eddy currents.
McHale Edward J. (Medfield MA) Hussain Yousif A. (Horley GB2) Sanderson Michael L. (Stockport GB2) Hemp John (Cranfield GB2), Capacitively-coupled magnetic flowmeter.
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