Method and device for liquid level measurement
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0061355
(2002-02-04)
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우선권정보 |
SE-199902594 (1999-07-02) |
발명자
/ 주소 |
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출원인 / 주소 |
- Saab Marine Electronics AB
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대리인 / 주소 |
Westman, Champlin & Kelly, P.A.
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인용정보 |
피인용 횟수 :
7 인용 특허 :
8 |
초록
A liquid level measuring gauging system including a radar antenna, a plurality of functionally independent radar measuring channels, and a feeder operably connected with the channels and operable to feed microwave signals of the channels to the antenna.
대표청구항
▼
1. A liquid level measuring gauging system, comprising:a radar antenna;a plurality of functionally independent radar measuring channels; anda feeder operably connected with the channels and operable to feed microwave signals of the channels to the antenna. 2. The system according to claim 1, wherein
1. A liquid level measuring gauging system, comprising:a radar antenna;a plurality of functionally independent radar measuring channels; anda feeder operably connected with the channels and operable to feed microwave signals of the channels to the antenna. 2. The system according to claim 1, wherein the feeder comprises a waveguide member for each channel. 3. The system according to claim 2, further comprising:a plurality of transmission lines operable to feed microwave signals of the channels to the waveguide members of the feeder. 4. The system according to claim 3, wherein the transmission lines are galvanically isolated from the waveguide members. 5. The system according to claim 3, further comprising:an electrically insulating washer for galvanically isolating the transmission lines from the waveguide members. 6. The system according to claim 2, further comprising:microwave signal insulation between at least two of the waveguide members. 7. The system according to claim 2, wherein at least adjacent waveguide members are arranged orthogonally with respect to each other. 8. The system according to claim 1, further comprising:a common waveguide outlet for all waveguide members, the common waveguide outlet being arranged at a waveguide interconnection. 9. The system according to claim 1, wherein the microwave signals are indistinguishable from each other. 10. The system according to claim 1, wherein the microwave signals are distinguishable from each other. 11. The system according to claim 1, comprising three channels. 12. The system according to claim 1, wherein one of the channels measures a maximum permitted level and one of the channels measures a level. 13. The system according to claim 12, wherein more than one channel measures a maximum permitted level. 14. The system according to claim 12, wherein more than one channel measures a level. 15. The system according to claim 1, wherein the channels are galvanically isolated from each other. 16. The system according to claim 1, further comprising:coaxial connectors for connecting the channels to the feeder. 17. The system according to claim 1, wherein the radar antenna, radar measuring channels, and feeder are arranged in one aperture in a liquid holding tank. 18. A liquid level measuring gauging system, comprising:a radar antenna;a first radar measuring channel connected to the radar antenna and comprising a transmitter, a receiver and an indicating element; andat least one further radar-measuring channel connected to the radar antenna, the radar waves of the further radar-measuring channel being distinguishable from the radar waves used in the first radar-measuring channel. 19. A liquid level measuring gauging system, comprising:an antenna unit;a feeder operable to feed at least two distinguishable microwave signals to the antenna unit, the feeder comprising at least two waveguide members, each waveguide member operable to receive one of the microwave signals of a transmission line;a plurality of functionally independent channels operable to distribute the microwave signals;a plurality of transmission lines operable to forward the microwave signals of the channels to the waveguide members of the feeder; anda common waveguide outlet for all waveguide members, the common waveguide outlet being arranged at a waveguide interconnection. 20. An antenna feeder, comprising:at least two waveguide members each operable to receive a microwave signal from a transmission line operable to forward the microwave signal of one of a plurality of functionally independent channels to the waveguide members; anda common waveguide outlet for all waveguide members, the common waveguide outlet being arranged at a waveguide interconnection. 21. A method for measuring level in a receptacle, the method comprising:distributing a plurality of distinguishable electromagnetic signals in separate channels;feeding each signal to a separate waveguide member; andtransmitting the signals from each waveguid e member to a common outlet. 22. A method for measuring a level in a receptacle using radar, the method comprising:transmitting electromagnetic waves with radar measuring channels via a single aerial directed down into a receptacle, the waves being distinguishable by a detectable characteristic for each channel;receiving a reflected time-delayed wave; andcalculating a level from the time delay. 23. The method according to claim 22, wherein the waves are distinguishable time-wise. 24. The method according to claim 22, wherein the waves are distinguishable by at least one of modulation and polarization. 25. The method according to claim 22, wherein the waves are used to execute redundant level measurements. 26. The method according to claim 22, wherein a level measurement is executed with one wave that produces a high level alarm. 27. A method in a level measuring gauging system for feeding at least two distinguishable microwave signals distributed in separated channels to a single antenna hardware, the method comprising:providing a waveguide member for each microwave signal;forwarding each microwave signal to an associated waveguide member through a transmission line associated with the signal;galvanically isolating the transmission line from the associated waveguide member; andtransmitting the signals from each waveguide member via an outlet common for all waveguide members. 28. The method according to claim 27, further comprising:galvanically isolating the channels from each other.
이 특허에 인용된 특허 (8)
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Lewis Bernard L. (Oxon Hill MD), Integrated weapon control radar system.
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Edvardsson Kurt O. (Linkping SEX), Method and apparatus for level measurement with microwaves.
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Locke John W. (Tempe AZ), Method and apparatus for material level measurement using stepped frequency microwave signals.
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Dalrymple Thomas H. (Crown Point IN) Jean Buford R. (Round Rock TX) Erb Tom L. (Austin TX) Whitehead Frederick L. (Austin TX), Method and apparatus for monitoring a flowable material in a transportable vessel.
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Mikael Kleman SE, Method and device for liquid level measurement by means of radar radiation.
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Stones David I. ; Lee Alfred E., Monolithic 3D radial power combiner and splitter.
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Brendle Jean-Claude (Brest FRX) Cornic Pascal (St Renan FRX) Crenn Patrice (Brest FRX), Radar method and device for the measurement of distance.
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Bowling Donald R. (Ridgecrest CA) Smith Charles F. (Ridgecrest CA), Symmetric waveguide junction combiner.
이 특허를 인용한 특허 (7)
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Kleman, Mikael, FMCW-type radar level gauge.
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Kise, Masayuki; Muraishi, Akihiro, High liquid-level alarm device.
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Edvardsson, Olov, Multi-channel guided wave radar level gauge.
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Åkerstr��m,Tomas; Welin,Anders, Radar level gauge system with variable alarm limits.
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Nilsson,Valter, Radar level gauge with a galvanically isolated interface.
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Kleman, Mikael; Westerling, Jan, Radar level gauging system.
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Andersson,Agne, Radar level-measuring device.
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