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1.发明授权公开(公告)号：US12104943B2
公开(公告)日：2024-10-01
申请号：US17122252
申请日：2020-12-15
发明人： Mikael Eriksson
IPC分类号： G01F23/284 , G01S13/10 , G01S13/24 , G01S13/88 , H01Q1/22
CPC分类号： G01F23/284 , G01S13/103 , G01S13/24 , G01S13/88 , H01Q1/225
摘要： A guided wave radar level gauge for determining a fill level of a product contained in a tank comprising: a transceiver configured to provide a transmit signal, Tx-signal, in the form of a pulse train, having a controllable pulse repetition frequency fTx, and to receive a reflected signal resulting from a reflection of the transmit signal at a surface of the product; a probe connected to the transceiver and configured to propagate the Tx-signal towards the surface and to return the reflected signal to the transceiver, the probe having a known length; and control circuitry configured to determine the fill level based on the received reflected signal, wherein the control circuitry is further configured to set the pulse repetition frequency based on the length of the probe.
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公开(公告)号：US11920970B2
公开(公告)日：2024-03-05
申请号：US18321024
申请日：2023-05-22
发明人： Christer Frövik , Olov Edvardsson
IPC分类号： G01F23/284 , G01F25/20 , G01S7/00 , G01S7/02 , G01S7/40 , G01S13/08 , G01S13/42 , G01S13/46 , G01S13/88 , H01Q1/22
CPC分类号： G01F23/284 , G01F25/20 , G01S7/003 , G01S7/025 , G01S7/4008 , G01S7/4021 , G01S7/4026 , G01S7/403 , G01S13/08 , G01S13/426 , G01S13/46 , G01S13/88 , H01Q1/225
摘要： A method of determining a filling level of a product in a tank having a tank wall, the method comprising: generating and transmitting an electromagnetic first transmit signal; propagating the first transmit signal through a tank atmosphere towards a corner reflector formed by the surface of the product and the tank wall where the surface of the product meets the tank wall, the corner reflector being at a known horizontal distance from the radar level gauge system; receiving an electromagnetic first reflection signal resulting from reflection of the first transmit signal at the corner reflector; determining a measure indicative of a propagation direction of the first reflection signal; and determining the filling level based on the measure indicative of the propagation direction of the first reflection signal and the known horizontal distance between the radar level gauge system and the corner reflector.
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公开(公告)号：US11860024B2
公开(公告)日：2024-01-02
申请号：US17156883
申请日：2021-01-25
IPC分类号： G01F23/28 , G01F23/284 , F16K37/00
CPC分类号： G01F23/284 , F16K37/00
摘要： A valve arrangement for a guided wave radar level gauge including a valve housing holding a movable valve element having a through-opening, the movable valve element being configured to be movable between an open position and a closed position. A probe section arranged in the through-opening of the movable valve element. Upper and lower probe sections are located on respective sides of the movable valve element. A spring-loaded connection assembly is configured to form an electrical connection between the upper and the lower probe section via the probe section in the movable valve element when the movable valve element is in an open position.
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公开(公告)号：US20230280201A1
公开(公告)日：2023-09-07
申请号：US18168648
申请日：2023-02-14
发明人： Leif Nilsson , Tobias Lilja , Hans Arkesten
IPC分类号： G01F23/284 , G01D21/02
CPC分类号： G01F23/284 , G01D21/02
摘要： A field device comprising measurement circuitry; loop current circuitry; voltage measurement circuitry; and a controller configured to: acquire a first value of a process variable; determine if the voltage received by the field device is sufficient to support a first loop current; control, when the voltage is insufficient to support the first loop current, the loop current to an alarm current lower than a predefined alarm threshold current; acquire a second value of the process variable and a present voltage received by the field device; determine a second loop current; determine, based on the present voltage and an estimation of a loop impedance, whether or not the present voltage is sufficient for supporting the second loop current; and control, when it is determined that the present voltage received by the field device from the current loop is sufficient, the loop current from the alarm current to the second loop current.
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公开(公告)号：US20230003571A1
公开(公告)日：2023-01-05
申请号：US17834311
申请日：2022-06-07
IPC分类号： G01F23/284
摘要： A filling level determination system, for determining a filling level of a product in a tank, comprising a measurement unit for arrangement at a measurement position, the measurement unit including a transceiver; and an antenna arrangement coupled to the transceiver for radiating an electromagnetic transmit signal generated by the transceiver from the measurement position towards a target position on the tank wall, and for returning an electromagnetic first reflection signal resulting from reflection of the transmit signal at the target position back towards the transceiver; and processing circuitry coupled to the transceiver of the measurement unit and being configured to determine the filling level based on tank deformation data indicative of a known relation between the level of the product in the tank and deformation of the tank at the first target position, and a timing relation between the first transmit signal and the first reflection signal.
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公开(公告)号：US20220074783A1
公开(公告)日：2022-03-10
申请号：US17417164
申请日：2019-02-07
发明人： Stig Larsson
IPC分类号： G01F23/284 , H01Q1/22 , H01Q1/00 , G01S13/88
摘要： A radar level gauge system includes a transceiver; an antenna; a hollow waveguide for guiding the transmit signal from a first end facing the transceiver towards a second end facing the antenna; a housing including a heat-dissipating structure arranged at a first distance from the second end; a first thermal connection between the hollow waveguide and the heat-dissipating structure; and a second thermal connection between the hollow waveguide and the housing arranged at a second distance, shorter than the first distance, from the second end. The first and second thermal connection are arranged such that a thermal resistance of a first heat conduction path from the second end of the hollow waveguide through the first thermal connection to the heat-dissipating structure, is lower than a thermal resistance of a second heat conduction path from the second end of the hollow waveguide through the second thermal connection to the housing.
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公开(公告)号：US10948332B2
公开(公告)日：2021-03-16
申请号：US15349062
申请日：2016-11-11
发明人： Mikael Kleman
IPC分类号： G01F23/284 , G01S7/35 , G01S13/34 , G01S13/10
摘要： A radar level gauge comprising transceiver circuitry, a propagation device and processing circuitry for determining a value of the process variable based on a relationship between a transmit signal and a return signal. The gauge has a DC/DC converter connected to a power supply interface, and configured to convert a first voltage to a second voltage, lower than the first voltage, and an energy storage. The gauge further has a switch, connected between the DC/DC converter and the energy storage, the switch having a non-conducting state for disconnecting the energy storage from the DC/DC converter when the transceiver circuitry is active, and a conducting state for connecting the energy storage to the DC/DC converter only when the transceiver circuitry is inactive.
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公开(公告)号：US10942057B2
公开(公告)日：2021-03-09
申请号：US16018258
申请日：2018-06-26
发明人： Olov Edvardsson , Anders Jirskog
IPC分类号： G01F23/284 , G01F25/00 , G01S13/88
摘要： A radar level gauge having a wave guiding structure arranged to guide a measurement signal towards the surface and to return the reflected signal, and an electromagnetic wave transducer arranged to emit the measurement signal into the wave guiding structure as electromagnetic waves. The electromagnetic wave transducer has a plurality of radiating elements arranged in N−1 concentric feeder rings, where a radius of each feeder ring coincides with a radial zero of an electrical field of the H0N-mode, and feeding circuitry connected to feed the measurement signals from the transceiver circuitry to the radiating elements, thereby causing the electromagnetic wave transducer to excite electromagnetic waves in the H01-mode.
With this choice of feeder ring radii, the H0N mode will not be excited.-
公开(公告)号：US10816384B2
公开(公告)日：2020-10-27
申请号：US15798677
申请日：2017-10-31
发明人： Christer Frövik , Anders Friedmann
IPC分类号： G01F23/284 , G01S7/292 , G01S7/00
摘要： A method of determining at least a first interface level of a first interface in a tank containing a stratified substance composition, comprising the steps of generating and transmitting an electromagnetic transmit signal; guiding the transmit signal at least partly through the stratified substance composition; returning an electromagnetic reflection signal resulting from reflection of the transmit signal; receiving, the reflection signal; determining, based on the reflection signal and a timing relation between the reflection signal and the transmit signal, an echo signal exhibiting an echo signal strength as a function of a propagation parameter indicative of position along the probe; and determining, the first interface level based on a first propagation parameter value indicative of a first threshold position for which the echo signal has reached a predetermined first threshold signal strength, and a first offset indicative of a first offset distance from the first threshold position.
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公开(公告)号：US10801873B2
公开(公告)日：2020-10-13
申请号：US16140783
申请日：2018-09-25
发明人： Jan Westerling , Håkan Nyberg
IPC分类号： G01F23/284 , G01S13/88 , G01S7/02
摘要： A radar level gauge system comprising a first transceiver; a second transceiver; an antenna arranged to radiate a first transmit signal generated by the first transceiver and a second transmit signal generated by the second transceiver, and to receive a first reflection signal and a second reflection signal; a tubular waveguide to guide the transmit signals towards the interface, and to guide the reflection signals back towards the antenna; a plurality of signal interacting structures arranged at different levels along a the tubular waveguide, to selectively interact with the second transmit signal to contribute to the second reflection signal; and processing circuitry to determine a level of the interface between liquid phase product and vapor phase product based on a relation between the first transmit signal and the first reflection signal, and a density distribution based on a relation between the second transmit signal and the second reflection signal.
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