[특허]Guided wave radar level gauging with probe retaining element

Rosemount Tank Radar AB

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특허 상세정보

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Guided wave radar level gauging with probe retaining element

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01F-023/284 G01S-007/02 G01S-013/02
출원번호	US-0138611 (2013-12-23)
등록번호	US-9541443 (2017-01-10)
발명자 / 주소	Edvardsson, Olov
출원인 / 주소	Rosemount Tank Radar AB
대리인 / 주소	Westman, Champlin & Koehler, P.A.
인용정보	피인용 횟수 : 0 인용 특허 : 12

초록
▼

A GWR level gauge system for determining a filling level in a tank. The system comprises a tank, a transceiver, a surface waveguide comprising a single conductor transmission line probe, connected to the transceiver, arranged extending vertically into the tank and configured to guide the electromagnetic transmission signals towards the surface and to guide the reflected electromagnetic signals back to the transceiver; processing circuitry connected to the transceiver and configured to determine the filing level based on received reflected electromagnetic signals; a plurality of retaining elements arranged in fixed positions in relation to an inside of the tank and spaced apart along the probe, wherein each of the retaining elements circumscribes the probe, and is configured to allow movement of the probe in a vertical direction relative the retaining element, and to restrict movement of the probe in a horizontal direction relative the retaining element.

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청구항
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1. A guided wave radar level gauge system for determining a filling level of a product contained in a tank, which level gauge system comprises: a tank having an inside wall, a roof, a bottom;a transceiver for transmitting electromagnetic transmission signals and receiving reflected electromagnetic signals reflected at a surface of said product;a surface waveguide comprising a single conductor transmission line probe, connected to said transceiver, arranged extending vertically into said tank and configured to guide said electromagnetic transmission signals towards said surface and to guide said reflected electromagnetic signals back to said transceiver;processing circuitry connected to said transceiver and configured to determine said filing level based on received reflected electromagnetic signals;a plurality of retaining elements arranged in fixed positions in relation to an inside of said tank and spaced apart along said probe,wherein each of said retaining elements circumscribes said probe, and is configured to allow movement of said probe in a vertical direction relative said retaining element, and to restrict movement of said probe in a horizontal direction relative said retaining element. 2. The guided wave radar level gauge according to claim 1, wherein at least one of said plurality of retaining elements is attached to a support structure extending substantially in parallel with said probe. 3. The guided wave radar level gauge according to claim 2, wherein said support structure is a support tower being attached to and extending substantially vertically from said roof of said tank. 4. The guided wave radar level gauge according to claim 2, wherein said retaining element comprises an electrically insulating clamping portion fixedly attached to said probe and a flexible portion attached to said support structure, wherein said flexible portion is flexible at least in a direction parallel to the vertical extension of said probe. 5. The guided wave radar level gauge according to claim 2, wherein said support structure is said tank wall. 6. The guided wave radar level gauge according to claim 1, wherein said retaining element comprises an electrically insulating material. 7. The guided wave radar level gauge according to claim 1, wherein said probe is a flexible wire probe. 8. The guided wave radar level gauge according to claim 1, wherein each retaining element comprises at least a first electrically insulating contacting portion and a second electrically insulating contacting portion, vertically spaced in relation to said probe, wherein each contacting portion is configured to make contact with said probe at a contact location along said probe, and wherein a distance between adjacent contact locations is approximately equal to a quarter of a wavelength of said transmission signal. 9. The guided wave radar level gauge according to claim 8, wherein each contacting portion is configured to reflect a portion of said transmission signal to form a reflection signal, such that an accumulated reflected signal, resulting from a superposition of a plurality of reflection signals, has an amplitude lower than each of said reflection signals. 10. The guided wave radar level gauge according to claim 8, wherein: said first contacting portion is configured to reflect a portion of said transmission signal to form a first reflection signal;said second contacting portion is configured to reflect a portion of said transmission signal to form a second reflection signal; said retaining element further comprising:a third contacting portion, arranged below said second contacting portion at a distance approximately equal to a quarter of a wavelength of said transmission signal, and configured to reflect a portion of said transmission signal to form a third reflection signal;wherein said contacting portions are further configured such that an amplitude of each of said first and third reflection signals is approximately half of an amplitude of said second reflection signal. 11. The guided wave radar level gauge according to claim 8, wherein: said first contacting portion is configured to reflect a portion of said transmission signal to form a first reflection signal;said second contacting portion is configured to reflect a portion of said transmission signal to form a second reflection signal; said retaining element further comprising:a third contacting portion, arranged below said second contacting portion at a distance approximately equal to a quarter of a wavelength of said transmission signal, and configured to reflect a portion of said transmission signal to form a third reflection signal;a fourth contacting portion, arranged below said third contacting portion at a distance approximately equal to a quarter of a wavelength of said transmission signal, and configured to reflect a portion of said transmission signal to form a fourth reflection signal;wherein said contacting portions are configured such that an amplitude of said first reflection signal is equal to an amplitude of said fourth reflection signal, an amplitude of said second reflection signal is equal to an amplitude of said third reflection signal, and said amplitude of said first and fourth reflection signals is approximately one third of said amplitude of said second and third reflection signals. 12. The guided wave radar level gauge according to claim 1, wherein said retaining element comprises a plurality of pins spaced apart in the vertical direction and arranged such that in a projection on the horizontal plane each pin overlaps at least one other pin. 13. The guided wave radar level gauge according to claim 12, wherein each of said pins is enclosed by a ceramic housing. 14. The guided wave radar level gauge according to claim 13, wherein a flexible material is arranged between said pin and said ceramic housing. 15. The guided wave radar level gauge according to claim 1, wherein a first portion of said retaining element is spaced apart in the vertical direction with respect to a second portion of said retaining element to form an opening between the first portion and the second portion such that said probe may be laterally inserted through said opening into an area circumscribed by said retaining element. 16. The guided wave radar level gauge according to claim 15, wherein said retaining element has the form of a helix. 17. The guided wave radar level gauge according to claim 1, wherein said probe is attached to the bottom of said tank. 18. The guided wave radar level gauge according to claim 1, wherein said probe comprises a bottom weight attached to an end portion of said probe. 19. A method for arranging a probe in a guided wave radar level gauge system for determining a filling level of a product contained in a tank, which level gauge system comprises: a tank having an inside wall, a roof, a bottom;a transceiver for transmitting electromagnetic transmission signals and receiving reflected electromagnetic signals reflected at a surface of said product;a surface waveguide comprising a single conductor transmission line probe, connected to said transceiver;processing circuitry connected to said transceiver and configured to determine said filing level based on received reflected electromagnetic signals; said method comprising:arranging a plurality of retaining elements in fixed positions in relation to an inside of said tank and spaced apart along said probe, wherein each of said retaining elements circumscribes said probe, and is configured to allow movement of said probe in a vertical direction relative said retaining element, and to restrict movement of said probe in a horizontal direction relative said retaining element; andarranging said probe to extend vertically into said tank and to extend through each of said retaining elements.

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Guided wave radar level gauging with probe retaining element

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Guided wave radar level gauging with probe retaining element

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