WO2017044437A1 - An apparatus and method to detect liquid material at the end of the waveguide in a guided wave radar system - Google Patents
An apparatus and method to detect liquid material at the end of the waveguide in a guided wave radar system Download PDFInfo
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- WO2017044437A1 WO2017044437A1 PCT/US2016/050457 US2016050457W WO2017044437A1 WO 2017044437 A1 WO2017044437 A1 WO 2017044437A1 US 2016050457 W US2016050457 W US 2016050457W WO 2017044437 A1 WO2017044437 A1 WO 2017044437A1
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- probe
- level
- signal
- process fluid
- transceiver
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
Definitions
- This disclosure relates generally to guided wave radar systems. More specifically, this disclosure relates to an apparatus to detect liquid material at the end of a waveguide in a guided wave radar system.
- This disclosure provides a modified waveguide design to detect liquid material at the end of a waveguide in a guided wave radar system.
- an apparatus in a first embodiment, includes a transceiver configured to generate a signal and receive a plurality of reflected signals for measurement of a level of a process fluid in a tank.
- the apparatus also includes a waveguide that includes a probe and a buoyant part.
- the probe is configured to guide the signal from the transceiver and the plurality of reflected signals to the transceiver.
- the buoyant part is configured to move with the level of the process fluid at an end of the probe and produce a secondary signal representing the level of the process fluid when a level signal of the process fluid is within an end signal representing the end of the probe.
- a waveguide in a second embodiment, includes a probe and a buoyant part.
- the probe is configured to guide the signal from the transceiver and the plurality of reflected signals to the transceiver.
- the buoyant part is configured to move with a level of a process fluid at an end of the probe and produce a secondary signal representing the level of the process fluid when a level signal of the process fluid is within an end signal representing the end of the probe.
- a method in a third embodiment, includes generating a signal from a transceiver along a probe for measuring a level of a process fluid. The method also includes reflecting a secondary signal representing the level of the process fluid that is produced from the signal reflecting off a buoyant part of an end of the probe. The method further includes receiving the secondary signal at the transceiver.
- FIGURE 1 illustrates an example guided wave radar (GWR) level sensor according to this disclosure:
- FIGURES 2A, 2B and 2C illustrate sample transmitted pulses that have been received after reflection according to this disclosure
- FIGURES 3A, 3B, 3C, 3D, 3E and 3F illustrate different modifications of the end weight according to this disclosure.
- FIGURE 4 illustrates an example method for detecting process fluids at the end of a waveguide in a guided wave radar system according to this disclosure.
- FIGURES 1 through 4 discussed below, aid the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed, in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any type of suitably arranged device or system.
- the measurement is performed along a probe.
- the ability to make an accurate measurement ends nearly at the end of the probe.
- the signal reflection such as an electromagnetic wave reflection
- the signal reflection from the end of the probe is significantly stronger than the signal reflection from the medium approaching the end of the probe.
- the signal reflection such as an electromagnetic wave reflection
- the signal reflection from the medium approaching the end of the probe is significantly stronger than the signal reflection from the medium approaching the end of the probe.
- the liquid in the storage tank is almost depleted or at a level within the end weight, the smaller reflection from the liquid is more difficult to detect over the greater reflection of the end of the probe.
- This situation makes reliable detection and tracking of the level reflection difficult when the level of the liquid is close to the end of the probe. This is especially true for low DC liquids such as oils, fuels, liquefied gasses, etc.
- the measurements at this level can also be erratic.
- FIGURE 1 illustrates an example guided wave radar (GWR) level sensor 100 according to this disclosure.
- the level sensor 100 utilizes a transceiver 105 to send transmitted pulses 110 through a modified waveguide 115.
- the probe 185 extends through an interior space 160 of a process fluid reservoir, tank 155, process fluid chamber, or other space into a process fluid 120 (sometimes under pressure).
- the modified waveguide 1 15 includes a probe 185 that can be a flexible wire, a rigid rod, or a coaxial cable.
- the probe 185 will be described as a flexible wire with an end weight at the end 125 of the probe 185.
- both are rigid enough that the end 125 of the probe 185 can be unattached or attached to the bottom 165 of the tank 155.
- the end 125 of the probe 185 produces a stronger reflected signal than the surface of the fluid with low DC.
- the probe 185 When the probe 185 is a flexible wire, the probe 185 is held tight by an end weight, which assists keeping the probe 185 straight and vertical for increasing the reliability of the level measurements. At least some of the transmitted pulses 110 are reflected from the surface 140 of the process fluid 120 and travel back as reflected pulses 130 to the transceiver 105 along the probe 185.
- the transceiver 105 receives the reflected pulses 130, and the level sensor 100 calculates the fluid level 145 or height of the process fluid 120 in the space 160. For instance, the level sensor 100 could perform time-of-flight or other calculations to identify a distance 150 from the transceiver 105 to the level 145 of the process fluid 120.
- the level sensor 100 can use the calculated level 145 of the process fluid 120 in any suitable manner, such as by communicating the calculated distance to a control system 180 or other destination(s) over at least one signaling medium 135. While the signaling medium 135 is shown here as a wired connection, other types of signaling media (such as wireless connections) could be supported by the level sensor 100.
- the dielectric constant of the process fluid 120 causes a variation in the impedance seen by the transmitted pulses 110 along the probe 185, which causes the reflected pulses 1 30 to return along the probe 185.
- the level sensor 100 can be employed to measure the level 145 of each layer within the process fluid 120.
- the end weight can be a part of the modified waveguide 115 or an additional piece. Gravity and buoyancy are taken into consideration when deciding the shape and material of the end weight.
- the end weight can include different configurations that react to the buoyancy of the process fluid 120 in order to strengthen the reflected pulse 130 at the surface 140 when the fluid level 145 approaches the end weight.
- a guide wire serves as the probe 185 in the example of FIGURE 1 and extends into the interior 160 of the tank 155 (often but not necessarily from the top of the tank 155) toward the bottom 165 of the tank 155. Since the probe 185 should extend into the process fluid 120, the probe 185 could extend far enough through the interior 160 of the tank 155 so that its bottom end 125 is close to the bottom surface 165 of the tank 155.
- the probe 185 is either a rigid rod or coaxial cable, a buoyant part can be mounted at the end of the probe 185 without a need for an end weight.
- a process connector 170 connects the modified waveguide 115 to the transceiver 105.
- the process connector 170 is mounted on a bulkhead 175 over an opening in the tank 155, although the process connector 170 could be used or mounted in other ways.
- the transceiver 105 is communicably coupled by the signaling medium 135 to the control system 180.
- the signaling medium 135 could denote any suitable analog or digital signaling media, including wired and wireless connections.
- the control system 180 could communicate control signals to the level sensor 100 and receive level measurements from the level sensor 100 via the signaling medium 135.
- Transmitted pulses 110 from the transceiver 105 travel along the probe 185 to a location at which the probe 185 passes through the top surface 140 of the process fluid 120.
- Reflected pulses 130 reflect at the surface 140 of the process fluid 120 and are received by the transceiver 105.
- Logic (implemented within the level sensor 100, at the control system 180, or at other location(s)) can be employed to determine the level 145 of the process fluid 120.
- FIGURE 1 illustrates one example of a GWR level sensor 100
- the GWR level sensor 100 could be used with other types of level sensors or other devices where at least one electrical connection is needed or desired.
- the GWR level sensor 100 could be used to allow an electrical connection between an antenna within a tank and a transceiver or other circuitry outside the tank.
- FIGURE 1 shows the use of a flexible wire as the probe 185, other types of probes 185 could be used.
- FIGURES 2A-2C illustrate sample transmitted pulses that have been received after reflection according to the various embodiments of the present disclosure.
- FIGURES 2A-2C depict the bottom portions of a level sensor 200 along with the signal 205 received corresponding to the depth of the reading.
- the embodiments shown in FIGURES 2A-2C may be associated with the GWR level sensor 100 1 . Additionally or alternatively, the embodiments shown in
- FIGURES 2A-2C may be associated any other suitable sensor or system.
- FIGURE 2A depicts a level 210 of the process fluid above an end weight 215.
- the le vel 210 of the process fluid is determined from a level signal 220 received by a transceiver, such as the transceiver 105. Because the process fluid has a low dielectric constant, the amplitude 225 of the level signal 220 is tiny compared to the amplitude 230 of the end weight signal 235.
- FIGURE 2B depicts a level 210 of the process fluid where the level signal 220 is within the end weight signal 235. In this situation, the level signal 220 is more difficult to determine, leading to false or erratic level readings.
- FIGURE 2C depicts a modified end weight 240.
- the modified end weight 240 includes two buoyant arms 245 that are slidably coupled to the end weight 240.
- the top portion 250 of the buoyant arms 245 produces a secondary signal 255 that is greater than the level signal.
- the top portion 250 of the buoyant arms 245 are arranged to float on the surface of the process fluid, so that the secondary signal 255 can be used to determine the level 210 of the process fluid.
- FIGURES 3A-3F illustrate different modifications of an end weight according to this disclosure.
- Each modified end weight includes a weighted portion for providing tension on the flexible wire probe for keeping the probe vertical, and a buoyant part configured to produce a secondary signal representing the level of the process fluid.
- the modified end weights 300, 305, 310, 315, 320, 325 include various components that allow reflection of at least one signal, and could be employed as the end weight in FIGURE 1.
- FIGURES 3 A, 3B, and 3C illustrate modified end weights 300, 305, 310 with flexible arms 330 coupled to a main body 340.
- the modified end weights 300, 305, 310 includes the main body 340 with two flexible arms 330 that are connected to floats 335 made of a material with a high reflectivity or containing high reflectivity inserts. The inserts provide a high reflectivity for the electromagnetic signal used for measurement by the guided wave radar.
- the main body 340 is the weighted part of the modified end weights 300, 305, 310 that creates tension in the probe to enhance the accuracy of the level reading, and the floats 335 are the buoyant part of the modified end weights 300, 305, 310.
- the flexible arms 330 are coupled to the mam body 340 of the modified end weight 300 using a bolt 345.
- the flexible arms 330 remain in an upright position due to the floats 335, while the level 350 of the process fluid is above the modified end weight 300.
- the flexible arms 330 bend to allo the floats 335 to remain at the surface of the process fluid.
- the high reflectivity inserts in the floats 335 produce a secondary signal that corresponds with the level 350 of the process fluid.
- the flexible arms 330 are coupled to the main body 340 of the modified end weight 305.
- the floats 335 are shaped differently than the floats 335 in FIGURE 3A, comprising flat surfaces at the top and sides.
- the flexible arms 330 remain in an upright position due to the floats 335, while the level 350 of the process fluid is above the modified end weight 305.
- the flexible arms 330 bend to allow the floats 335 to remain at the surface of the process fluid.
- the high reflectivity inserts produce a secondary signal that corresponds with the level 350 of the process fluid.
- the flexible arms 330 are coupled to the top of the main body 340 of the modified end weight 310.
- the floats 335 remain in a spread position whil e the level 350 of the process fluid is above the modified end weight 310.
- the flexible arms 330 drop into a downward position due to the floats 335.
- the flexible arms 330 bend to allow the float 335 to remain at the surface of the process fluid.
- the high reflectivity inserts produce a secondaiy signal that corresponds with the level 350 of the process fluid.
- FIGURES 3D, 3E, and 3F illustrate modified end weights 315, 320, 325 with a weighted part 355 connected to a buoyant part 360.
- the weighted part 355 creates tension in the flexible wire probe, while the buoyant part. 360 enhances the reflected signal at the surface of the process fluid by creating a secondary signal .
- the buoyant part 360 changes the signal reflected from the end of the probe by getting closer to the weighted part 355 when the level of the process fluid reaches the end of the probe.
- FIGURE 3D illustrates a modified end weight 315 having a weighted part 355 connected to a buoyant part 360 by a wire 365.
- FIGURE 3E illustrates a modified end weight 320 having a weighted part 355 connected to a buoyant part 360 by a spring 370.
- FIGURE 3F illustrates a modified end weight 325 having a weighted part 355 connected to a buoyant part 360 by a polymer accordion 375.
- FIGURES 3A-3F illustrate examples of modified end weights
- various changes may be made to FIGURES 3A-3F.
- the relative sizes and shapes of different components within the connectors are for illustration only.
- the modification can be mounted directly at the end of the probe.
- the modification of the other probes may include a buoyant part that can move in relation to the end of the probe by means of flexible arms, sliding, mo vement of springs, accordions, or other components.
- FIGURE 4 illustrates an example method 400 for detecting process fluids at the end of a probe in a guided wave radar system according to this disclosure.
- the method 400 is described in connection with the level sensor 100 of FIGURE 1. and the modified end weights 300, 305, 310, 315, 320, 325 of FIGURE 3.
- the method 400 could involve the use of any other suitable components or devices.
- a transceiver In operation 402, a transceiver generates a signal along a probe for measuring a level of a process fluid. In operation 404, when the level signal from the reflection of the signal at the surface of the process fluid is within the end signal, a secondary signal is produced from the signal reflecting off the buoyant part of the end weight. In operation 406, the transceiver receives the secondary signal.
- FIGURE 4 illustrates one example of a method 400 for detecting process fluids at the end of a probe in a guided wave radar system
- various changes may be made to FIGURE 4.
- steps shown in FIGURE 4 could overlap, occur in parallel, occur in a different order, or occur any number of times.
- various functions described in this patent document are implemented or supported by a computer program that is formed from computer readable program code and that is embodied in a computer readable medium.
- the phrase "computer readable program code" includes any type of computer code, including source code, object code, and executable code.
- computer readable medium includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory.
- ROM read only memory
- RAM random access memory
- CD compact disc
- DVD digital video disc
- a "non-transitory” computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals.
- a non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device.
- phrases "at least one of,” when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one item in the list may be needed.
- “at least one of: A, B, and C” includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.
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Abstract
An apparatus (100) includes a transceiver (105) configured to generate a signal (110) and receive a plurality of reflected signals (130) for measurement of a level (145) of a process fluid (120) in a tank (155). The apparatus also includes a waveguide (115) comprising a probe (185) and a buoyant part (360). The probe is configured to guide the signal from the transceiver and the plurality of reflected signals to the transceiver. The buoyant part is configured to move with the level of the process fluid at an end (125) of the probe and produce a secondary signal (255) representing the level of the process fluid when a level signal (220) of the process fluid is within an end signal (235) representing the end of the probe.
Description
AN APPARATUS AND METHOD TO DETECT LIQUID MATERIAL AT THE END OF THE WAVEGUIDE IN A GUIDED WAVE RADAR SYSTEM
TECHNICAL FIELD
[00Θ1] This disclosure relates generally to guided wave radar systems. More specifically, this disclosure relates to an apparatus to detect liquid material at the end of a waveguide in a guided wave radar system.
BACKGROUND
[0002] Accuracy and consistency for level measurements is of great importance to different industries. Level measurements are taken and used for both processes and storage tanks for inventory and control. The reliable measurement and reporting of fluid level is often critical to a process efficiency and safety of a storage tank. The end of measurement range or the bottom of the tank receives special attention to reliably detect the emptiness or nearly emptiness of a product in a storage tank.
[0003] For non-contact level measurement methods employing time of flight methods, such as ultrasound, radar, and laser, the measurement extends nearly to the bottom of the tank with some margin defined by the manufacturer. Even then, the measurement is usually not possible or not reliable to the absolute bottom of the tank.
SUMMARY
[0004J This disclosure provides a modified waveguide design to detect liquid material at the end of a waveguide in a guided wave radar system.
[0005] In a first embodiment, an apparatus includes a transceiver configured to generate a signal and receive a plurality of reflected signals for measurement of a level of a process fluid in a tank. The apparatus also includes a waveguide that includes a probe and a buoyant part. The probe is configured to guide the signal from the transceiver and the plurality of reflected signals to the transceiver. The buoyant part is configured to move with the level of the process fluid at an end of the probe and produce a secondary signal representing the level of the process fluid when a level signal of the process fluid is within an end signal representing the end of the probe.
[ΘΘ06] In a second embodiment, a waveguide includes a probe and a buoyant part. The probe is configured to guide the signal from the transceiver and the plurality of reflected signals to the transceiver. The buoyant part is configured to move with a level of a process fluid at an end of the probe and produce a secondary signal representing the level of the process fluid when a level signal of the process fluid is within an end signal representing the end of the probe.
[0007] In a third embodiment, a method includes generating a signal from a transceiver along a probe for measuring a level of a process fluid. The method also includes reflecting a secondary signal representing the level of the process fluid that is produced from the signal reflecting off a buoyant part of an end of the probe. The method further includes receiving the secondary signal at the transceiver.
[0008] Other technical features may be readily apparent to one skilled in the art from the following figures, descriptions, and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009J For a more complete understanding of this disclosure, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:
[0010] FIGURE 1 illustrates an example guided wave radar (GWR) level sensor according to this disclosure:
[0011] FIGURES 2A, 2B and 2C illustrate sample transmitted pulses that have been received after reflection according to this disclosure;
[0012] FIGURES 3A, 3B, 3C, 3D, 3E and 3F illustrate different modifications of the end weight according to this disclosure; and
[0013] FIGURE 4 illustrates an example method for detecting process fluids at the end of a waveguide in a guided wave radar system according to this disclosure.
DETAILED DESCRIPTION
[0014J FIGURES 1 through 4, discussed below, aid the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed, in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any type of suitably arranged device or system.
[0015] In contacting level measurement methods, like guided wave radar, the measurement is performed along a probe. Typically, the ability to make an accurate measurement ends nearly at the end of the probe. In the case of measurements of liquid materials with a low dielectric constant (DC), the signal reflection (such as an electromagnetic wave reflection) from the end of the probe is significantly stronger than the signal reflection from the medium approaching the end of the probe. In other words, when the liquid in the storage tank is almost depleted or at a level within the end weight, the smaller reflection from the liquid is more difficult to detect over the greater reflection of the end of the probe. This situation makes reliable detection and tracking of the level reflection difficult when the level of the liquid is close to the end of the probe. This is especially true for low DC liquids such as oils, fuels, liquefied gasses, etc. The measurements at this level can also be erratic.
[0016] FIGURE 1 illustrates an example guided wave radar (GWR) level sensor 100 according to this disclosure. As shown in FIGURE I, the level sensor 100 utilizes a transceiver 105 to send transmitted pulses 110 through a modified waveguide 115. The probe 185 extends through an interior space 160 of a process fluid reservoir, tank 155, process fluid chamber, or other space into a process fluid 120 (sometimes under pressure). The modified waveguide 1 15 includes a probe 185 that can be a flexible wire, a rigid rod, or a coaxial cable. For convenience of discussion, the probe 185 will be described as a flexible wire with an end weight at the end 125 of the probe 185. When the probe is a rigid rod or a coaxial cable, both are rigid enough that the end 125 of the probe 185 can be unattached or attached to the bottom 165 of the tank 155. The end 125 of the probe 185 produces a stronger reflected signal than the surface of the fluid with low DC.
[0017] When the probe 185 is a flexible wire, the probe 185 is held tight by an end weight, which assists keeping the probe 185 straight and vertical for increasing the reliability of the level measurements. At least some of the transmitted pulses 110 are
reflected from the surface 140 of the process fluid 120 and travel back as reflected pulses 130 to the transceiver 105 along the probe 185. The transceiver 105 receives the reflected pulses 130, and the level sensor 100 calculates the fluid level 145 or height of the process fluid 120 in the space 160. For instance, the level sensor 100 could perform time-of-flight or other calculations to identify a distance 150 from the transceiver 105 to the level 145 of the process fluid 120. The level sensor 100 can use the calculated level 145 of the process fluid 120 in any suitable manner, such as by communicating the calculated distance to a control system 180 or other destination(s) over at least one signaling medium 135. While the signaling medium 135 is shown here as a wired connection, other types of signaling media (such as wireless connections) could be supported by the level sensor 100.
[0018] The dielectric constant of the process fluid 120 causes a variation in the impedance seen by the transmitted pulses 110 along the probe 185, which causes the reflected pulses 1 30 to return along the probe 185. When several process fluids have different dielectric constants and form multiple layers within the process fluid 120 (such as when an oil-based fluid, an emulsion or surfactant layer, and a water-based fluid are present), the level sensor 100 can be employed to measure the level 145 of each layer within the process fluid 120.
[0019] The end weight can be a part of the modified waveguide 115 or an additional piece. Gravity and buoyancy are taken into consideration when deciding the shape and material of the end weight. The end weight can include different configurations that react to the buoyancy of the process fluid 120 in order to strengthen the reflected pulse 130 at the surface 140 when the fluid level 145 approaches the end weight.
[0020] A guide wire serves as the probe 185 in the example of FIGURE 1 and extends into the interior 160 of the tank 155 (often but not necessarily from the top of the tank 155) toward the bottom 165 of the tank 155. Since the probe 185 should extend into the process fluid 120, the probe 185 could extend far enough through the interior 160 of the tank 155 so that its bottom end 125 is close to the bottom surface 165 of the tank 155. When the probe 185 is either a rigid rod or coaxial cable, a buoyant part can be mounted at the end of the probe 185 without a need for an end weight.
[0021] A process connector 170 connects the modified waveguide 115 to the transceiver 105. In this example, the process connector 170 is mounted on a bulkhead
175 over an opening in the tank 155, although the process connector 170 could be used or mounted in other ways. The transceiver 105 is communicably coupled by the signaling medium 135 to the control system 180. Note that while depicted as a simple twisted pair of conductors, the signaling medium 135 could denote any suitable analog or digital signaling media, including wired and wireless connections. As those skilled in the art will recognize, the control system 180 could communicate control signals to the level sensor 100 and receive level measurements from the level sensor 100 via the signaling medium 135.
[0022 J Transmitted pulses 110 from the transceiver 105 travel along the probe 185 to a location at which the probe 185 passes through the top surface 140 of the process fluid 120. Reflected pulses 130 reflect at the surface 140 of the process fluid 120 and are received by the transceiver 105. Logic (implemented within the level sensor 100, at the control system 180, or at other location(s)) can be employed to determine the level 145 of the process fluid 120.
[0023] Although FIGURE 1 illustrates one example of a GWR level sensor 100, various changes may be made to FIGURE 1. For example, the GWR level sensor 100 could be used with other types of level sensors or other devices where at least one electrical connection is needed or desired. As a particular example, the GWR level sensor 100 could be used to allow an electrical connection between an antenna within a tank and a transceiver or other circuitry outside the tank. Also, while FIGURE 1 shows the use of a flexible wire as the probe 185, other types of probes 185 could be used.
[0024J FIGURES 2A-2C illustrate sample transmitted pulses that have been received after reflection according to the various embodiments of the present disclosure. FIGURES 2A-2C depict the bottom portions of a level sensor 200 along with the signal 205 received corresponding to the depth of the reading. The embodiments shown in FIGURES 2A-2C may be associated with the GWR level sensor 100 1 . Additionally or alternatively, the embodiments shown in
FIGURES 2A-2C may be associated any other suitable sensor or system.
[0025J FIGURE: 2A depicts a level 210 of the process fluid above an end weight 215. The le vel 210 of the process fluid is determined from a level signal 220 received by a transceiver, such as the transceiver 105. Because the process fluid has a low dielectric constant, the amplitude 225 of the level signal 220 is tiny compared to the
amplitude 230 of the end weight signal 235. FIGURE 2B depicts a level 210 of the process fluid where the level signal 220 is within the end weight signal 235. In this situation, the level signal 220 is more difficult to determine, leading to false or erratic level readings. FIGURE 2C depicts a modified end weight 240. The modified end weight 240 includes two buoyant arms 245 that are slidably coupled to the end weight 240. The top portion 250 of the buoyant arms 245 produces a secondary signal 255 that is greater than the level signal. The top portion 250 of the buoyant arms 245 are arranged to float on the surface of the process fluid, so that the secondary signal 255 can be used to determine the level 210 of the process fluid.
[00261 FIGURES 3A-3F illustrate different modifications of an end weight according to this disclosure. Each modified end weight includes a weighted portion for providing tension on the flexible wire probe for keeping the probe vertical, and a buoyant part configured to produce a secondary signal representing the level of the process fluid. As shown in FIGURES 3A-3F, the modified end weights 300, 305, 310, 315, 320, 325 include various components that allow reflection of at least one signal, and could be employed as the end weight in FIGURE 1.
[00271 FIGURES 3 A, 3B, and 3C illustrate modified end weights 300, 305, 310 with flexible arms 330 coupled to a main body 340. The modified end weights 300, 305, 310 includes the main body 340 with two flexible arms 330 that are connected to floats 335 made of a material with a high reflectivity or containing high reflectivity inserts. The inserts provide a high reflectivity for the electromagnetic signal used for measurement by the guided wave radar. The main body 340 is the weighted part of the modified end weights 300, 305, 310 that creates tension in the probe to enhance the accuracy of the level reading, and the floats 335 are the buoyant part of the modified end weights 300, 305, 310.
[0028] As shown in FIGURE 3A, the flexible arms 330 are coupled to the mam body 340 of the modified end weight 300 using a bolt 345. The flexible arms 330 remain in an upright position due to the floats 335, while the level 350 of the process fluid is above the modified end weight 300. When the level 350 of the process fluid falls below the top of the modified end weight 300, the flexible arms 330 bend to allo the floats 335 to remain at the surface of the process fluid. The high reflectivity inserts in the floats 335 produce a secondary signal that corresponds with the level 350 of the process fluid.
[0029] As shown in FIGURE 3B, the flexible arms 330 are coupled to the main body 340 of the modified end weight 305. The floats 335 are shaped differently than the floats 335 in FIGURE 3A, comprising flat surfaces at the top and sides. The flexible arms 330 remain in an upright position due to the floats 335, while the level 350 of the process fluid is above the modified end weight 305. When the level 350 of the process fluid falls below the top of the modified end weight 305, the flexible arms 330 bend to allow the floats 335 to remain at the surface of the process fluid. The high reflectivity inserts produce a secondary signal that corresponds with the level 350 of the process fluid.
[00301 As shown in FIGURE 3C, the flexible arms 330 are coupled to the top of the main body 340 of the modified end weight 310. The floats 335 remain in a spread position whil e the level 350 of the process fluid is above the modified end weight 310. As the process fluid level 350 drops below the top of the modified end weight 310, the flexible arms 330 drop into a downward position due to the floats 335. When the level 350 of the process fluid falls below the top of the modified end weight 300, the flexible arms 330 bend to allow the float 335 to remain at the surface of the process fluid. The high reflectivity inserts produce a secondaiy signal that corresponds with the level 350 of the process fluid.
[0031] FIGURES 3D, 3E, and 3F illustrate modified end weights 315, 320, 325 with a weighted part 355 connected to a buoyant part 360. The weighted part 355 creates tension in the flexible wire probe, while the buoyant part. 360 enhances the reflected signal at the surface of the process fluid by creating a secondary signal . The buoyant part 360 changes the signal reflected from the end of the probe by getting closer to the weighted part 355 when the level of the process fluid reaches the end of the probe. FIGURE 3D illustrates a modified end weight 315 having a weighted part 355 connected to a buoyant part 360 by a wire 365. FIGURE 3E illustrates a modified end weight 320 having a weighted part 355 connected to a buoyant part 360 by a spring 370. FIGURE 3F illustrates a modified end weight 325 having a weighted part 355 connected to a buoyant part 360 by a polymer accordion 375.
[0032] Although FIGURES 3A-3F illustrate examples of modified end weights, various changes may be made to FIGURES 3A-3F. For example, the relative sizes and shapes of different components within the connectors are for illustration only. For other probes (e.g., coaxial cable or rigid rod) that do not use an end weight, the
modification can be mounted directly at the end of the probe. Similar to the flexible wire probe, the modification of the other probes may include a buoyant part that can move in relation to the end of the probe by means of flexible arms, sliding, mo vement of springs, accordions, or other components.
[0033] FIGURE 4 illustrates an example method 400 for detecting process fluids at the end of a probe in a guided wave radar system according to this disclosure. For ease of explanation, the method 400 is described in connection with the level sensor 100 of FIGURE 1. and the modified end weights 300, 305, 310, 315, 320, 325 of FIGURE 3. However, the method 400 could involve the use of any other suitable components or devices.
[0034] In operation 402, a transceiver generates a signal along a probe for measuring a level of a process fluid. In operation 404, when the level signal from the reflection of the signal at the surface of the process fluid is within the end signal, a secondary signal is produced from the signal reflecting off the buoyant part of the end weight. In operation 406, the transceiver receives the secondary signal.
[0035] Although FIGURE 4 illustrates one example of a method 400 for detecting process fluids at the end of a probe in a guided wave radar system, various changes may be made to FIGURE 4. For example, various steps shown in FIGURE 4 could overlap, occur in parallel, occur in a different order, or occur any number of times. [ΘΘ36] In some embodiments, various functions described in this patent document are implemented or supported by a computer program that is formed from computer readable program code and that is embodied in a computer readable medium. The phrase "computer readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer readable medium" includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory. A "non-transitory" computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals. A non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device.
[0037] It may be advantageous to set forth definitions of certain words and phrases
used throughout this patent document. The terms "transmit," "receive," and '"communicate," as well as derivatives thereof, encompasses both direct and indirect communication. The terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation. The term "or" is inclusive, meaning and/or. The phrase "associated with," as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, have a relationship to or with, or the like. The phrase "at least one of," when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one item in the list may be needed. For example, "at least one of: A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.
[0038] The description in the present application should not be read as implying that any particular element, step, or function is an essential or critical element that must be included in the claim scope. The scope of patented subject matter is defined only by the allowed claims. Moreover, none of the claims is intended to invoke 35 U.S.C. § 112(f) with respect to any of the appended claims or claim elements unless the exact words "means for" or "step for" are explicitly used in the particular claim, followed by a participle phrase identifying a function. Use of terms such as (but not limited to) "mechanism," "module," "device," "unit," "component," "element," "member," "apparatus," "machine," "system," "processor," or "controller" within a claim is understood and intended to refer to structures known to those skilled in the relevant art, as further modified or enhanced by the features of the claims themsel ves, and is not intended to invoke 35 U.S.C. § 112(f).
[0039] While this disclosure has described certain embodiments and generally associated methods, alterations and permutations of these embodiments and methods will be apparent to those skilled in the art. Accordingly, the above description of example embodiments does not define or constrain this disclosure. Other changes, substitutions, and alterations are also possible without departing from the spirit and scope of this disclosure, as defined by the following claims.
Claims
1. An apparatus (100) comprising:
a transceiver (105) configured to generate a signal (110) and receive a plurality of reflected signals (130) for measurement of a level (145) of a process fluid (120) in a tank (155);
a waveguide (115) comprising:
a probe (185) configured to guide the signal from the transceiver and the plurality of reflected signals to the transceiver; and
a buoyant part (360) configured to move with the level of the process fluid at an end (125) of the probe and produce a secondary signal (255) representing the level of the process fluid when a level signal (220) of the process fluid is within an end sign al (235) representing the end of the probe.
2. The apparatus of Claim 1, wherein the buoyant part comprises a high reflectivity material configured to produce the secondary signal.
3. The apparatus of Claim 1, wherein the buoyant part comprises one or more floats (335) at an end of one or more flexible arms (330).
4. The apparatus of Claim 1 , wherein the buoyant part is siidably coupled to sides of the end of the probe.
5. The apparatus of Claim I, wherein the probe comprises a flexible wire, a rigid rod, or a coaxial cable.
6. The apparatus of Claim 5, further comprising a weighted part (355) when the probe is a flexible wire.
7. The apparatus of Claim 6, wherein the weighted part and the buoyant part are connected by one of a spring (370) or a polymer accordion (375).
8. A waveguide (115) comprising:
a probe (185) configured to guide a signal (110) from a transceiver (105) and a
plurality of reflected signals to the transceiver; and
a buoyant part (360) configured to move with a level (145) of a process fluid (120) at an end (125) of the probe and produce a secondaiy signal (255) representing the level of the process fluid when a level signal (220) of the process fluid is within an end sign al (235) representing the end of the probe.
9. The waveguide of Claim 8, wherein the buoyant part comprises a high reflectivity material configured to produce the secondary signal.
10. The waveguide of Claim 8, wherein the probe comprises a flexible wire, a rigid rod, or a coaxial cable.
1 1. A method comprising:
generating a signal (1 10) from a transceiver (105) along a probe (185) for measuring a level (145) of a process fluid (120):
reflecting a secondaiy signal (255) representing the level of the process fluid that is produced from the signal reflecting off a buoyant part (360) at an end (125) of the probe; and
receiving the secondary signal at the transceiver.
12. The method of Claim 15, wherein the buoyant part comprises a high reflectivity material configured to produce the secondaiy signal.
13. The method of Claim 15, wherein the probe comprises a flexible wire, a rigid rod, or a coaxial cable.
Priority Applications (2)
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CN201680052393.8A CN108139467B (en) | 2015-09-11 | 2016-09-07 | Apparatus and method for detecting liquid material at the end of a waveguide in a guided wave radar system |
EP16844943.7A EP3347733B1 (en) | 2015-09-11 | 2016-09-07 | An apparatus and method to detect liquid material at the end of the waveguide in a guided wave radar system |
Applications Claiming Priority (2)
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US14/851,766 | 2015-09-11 | ||
US14/851,766 US10444055B2 (en) | 2015-09-11 | 2015-09-11 | Apparatus and method to detect liquid material at the end of the waveguide in a guided wave radar system |
Publications (1)
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WO2017044437A1 true WO2017044437A1 (en) | 2017-03-16 |
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PCT/US2016/050457 WO2017044437A1 (en) | 2015-09-11 | 2016-09-07 | An apparatus and method to detect liquid material at the end of the waveguide in a guided wave radar system |
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US (1) | US10444055B2 (en) |
EP (1) | EP3347733B1 (en) |
CN (1) | CN108139467B (en) |
WO (1) | WO2017044437A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10634542B2 (en) | 2016-06-22 | 2020-04-28 | Honeywell International Inc. | Adaptive sync control in radar level sensors |
CN108955816B (en) * | 2018-09-28 | 2024-05-14 | 优必得石油设备(苏州)有限公司 | Tension stabilizing device for probe waveguide wire |
CN109540266B (en) * | 2019-01-17 | 2023-11-07 | 北京锐达仪表有限公司 | Magnetostrictive liquid level meter and liquid level measurement method |
CN110346016A (en) * | 2019-08-14 | 2019-10-18 | 中广核研究院有限公司北京分公司 | Anti-radiation guide wave radar liquid level gauge |
CN111549865B (en) * | 2020-05-25 | 2021-06-22 | 张素平 | Anti-overflow water device with time measuring function |
US11391616B2 (en) * | 2020-08-21 | 2022-07-19 | Ametek Magnetrol Usa, Llc | Redundant level measuring system |
CN113108864A (en) * | 2021-03-31 | 2021-07-13 | 宝力马(苏州)传感技术有限公司 | Liquid level meter based on transmission and reflection characteristics of signal in variable impedance medium |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040093942A1 (en) * | 2001-02-07 | 2004-05-20 | Brun Per Morten | Level gauge for measuring the amount of liquid in a tank |
US20050241391A1 (en) | 2004-04-29 | 2005-11-03 | K-Tek, L.L.C. | Targeted guided wire level measuring device |
US20060169039A1 (en) * | 2005-02-01 | 2006-08-03 | Veeder-Root Company | Fuel density measurement device, system, and method |
US20060266113A1 (en) | 2005-05-31 | 2006-11-30 | Veeder-Root Company | Fuel density measuring device, system, and method using magnetostrictive probe bouyancy |
US7461550B2 (en) * | 2005-06-08 | 2008-12-09 | Lumenite Control Technology, Inc. | Self-calibrating liquid level transmitter |
US20140207395A1 (en) * | 2013-01-22 | 2014-07-24 | Ambroise Prinstil | Fuel Storage Tank Water Detector With Triggered Density |
US20150011953A1 (en) * | 2013-07-03 | 2015-01-08 | Dornoch Medical Systems, Inc. | Fluid level sensor cover for a medical waste fluid collection and disposal system |
Family Cites Families (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4158964A (en) * | 1978-05-10 | 1979-06-26 | The Foxboro Company | Method and apparatus for determining liquid level |
JPH0792252A (en) | 1993-09-22 | 1995-04-07 | Japan Radio Co Ltd | Radar transmitter for vessel |
US5421193A (en) * | 1993-12-30 | 1995-06-06 | Proeco, Inc. | Method and apparatus for leak detection with float excitation and self-calibration |
US5524487A (en) * | 1994-04-19 | 1996-06-11 | Liu; Paul | Level measuring device with an armless float |
US5656774A (en) * | 1996-06-04 | 1997-08-12 | Teleflex Incorporated | Apparatus and method for sensing fluid level |
US5900546A (en) * | 1997-07-24 | 1999-05-04 | Electromechanical Research Laboratories, Inc. | Liquid level indicator for storage tank |
EP1004858A1 (en) * | 1998-11-27 | 2000-05-31 | Endress + Hauser GmbH + Co. | Filling level gauge |
US6229476B1 (en) * | 1998-11-27 | 2001-05-08 | Endress+ Hauser Gmbh+ Co. | Liquid level meter |
DE10220073A1 (en) | 2002-05-04 | 2003-11-13 | Bosch Gmbh Robert | Short-range radar system with variable pulse duration |
US20040046572A1 (en) * | 2002-09-09 | 2004-03-11 | Champion James Robert | Determining levels of substances using multistatic probes |
US6802218B2 (en) * | 2002-09-09 | 2004-10-12 | Ametek, Inc. | Flexible level detection apparatus |
US7367231B1 (en) * | 2005-07-06 | 2008-05-06 | K-Tek, Corp. | Flexible guided wave level meter probe |
US7800528B2 (en) | 2007-07-31 | 2010-09-21 | Rosemount Tank Radar Ab | Radar level gauge with variable pulse parameters |
US20090085794A1 (en) * | 2007-09-28 | 2009-04-02 | Rosemount Tank Radar Ab | Radar level gauge system |
US8171786B2 (en) * | 2007-11-19 | 2012-05-08 | Petroleum Recovery Services, LLC | Fuel inventory monitoring system |
US20090265132A1 (en) * | 2008-04-18 | 2009-10-22 | Fafnir Gmbh | Device and method for determining the density of a fluid |
JP4712826B2 (en) | 2008-05-15 | 2011-06-29 | 古河電気工業株式会社 | Pulse Doppler radar device |
EP2166336B1 (en) * | 2008-09-18 | 2011-11-16 | FAFNIR GmbH | Method for monitoring the quality of a fuel containing alcohol in a storage tank |
US8656774B2 (en) * | 2009-11-24 | 2014-02-25 | Veeder-Root Company | Phase separation detector for fuel storage tank |
TWM394456U (en) * | 2010-06-25 | 2010-12-11 | Univ Vanung | Low water-level detector |
US20120137767A1 (en) * | 2010-12-06 | 2012-06-07 | Atek Products, Llc | Time domain reflectometry device and method |
US8902012B2 (en) | 2012-08-17 | 2014-12-02 | Honeywell International Inc. | Waveguide circulator with tapered impedance matching component |
US9105952B2 (en) | 2012-10-17 | 2015-08-11 | Honeywell International Inc. | Waveguide-configuration adapters |
US9217659B2 (en) | 2012-10-17 | 2015-12-22 | Magnetrol International, Incorporated | Guided wave radar probe with leak detection |
US8957741B2 (en) | 2013-05-31 | 2015-02-17 | Honeywell International Inc. | Combined-branched-ferrite element with interconnected resonant sections for use in a multi-junction waveguide circulator |
US9322699B2 (en) * | 2013-07-03 | 2016-04-26 | Rosemount Tank Radar Ab | Radar level gauge and methods of testing radar level gauge and system |
US9406987B2 (en) | 2013-07-23 | 2016-08-02 | Honeywell International Inc. | Twist for connecting orthogonal waveguides in a single housing structure |
US8803628B1 (en) | 2013-07-24 | 2014-08-12 | Honeywell International Inc. | Circulator with ferrite element attached to waveguide sidewalls |
HUE039331T2 (en) * | 2013-12-16 | 2018-12-28 | Grieshaber Vega Kg | Weight apparatus for a waveguide and method for producing a weight apparatus |
US9841307B2 (en) * | 2014-09-30 | 2017-12-12 | Rosemount Inc. | Multivariable guided wave radar probe |
US9518858B2 (en) * | 2014-10-14 | 2016-12-13 | Rosemount Tank Radar Ab | Guided wave radar level gauge system with reduced end of probe reflection |
-
2015
- 2015-09-11 US US14/851,766 patent/US10444055B2/en active Active
-
2016
- 2016-09-07 EP EP16844943.7A patent/EP3347733B1/en active Active
- 2016-09-07 WO PCT/US2016/050457 patent/WO2017044437A1/en active Application Filing
- 2016-09-07 CN CN201680052393.8A patent/CN108139467B/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040093942A1 (en) * | 2001-02-07 | 2004-05-20 | Brun Per Morten | Level gauge for measuring the amount of liquid in a tank |
US20050241391A1 (en) | 2004-04-29 | 2005-11-03 | K-Tek, L.L.C. | Targeted guided wire level measuring device |
US20060169039A1 (en) * | 2005-02-01 | 2006-08-03 | Veeder-Root Company | Fuel density measurement device, system, and method |
US20060266113A1 (en) | 2005-05-31 | 2006-11-30 | Veeder-Root Company | Fuel density measuring device, system, and method using magnetostrictive probe bouyancy |
US7461550B2 (en) * | 2005-06-08 | 2008-12-09 | Lumenite Control Technology, Inc. | Self-calibrating liquid level transmitter |
US20140207395A1 (en) * | 2013-01-22 | 2014-07-24 | Ambroise Prinstil | Fuel Storage Tank Water Detector With Triggered Density |
US20150011953A1 (en) * | 2013-07-03 | 2015-01-08 | Dornoch Medical Systems, Inc. | Fluid level sensor cover for a medical waste fluid collection and disposal system |
Non-Patent Citations (1)
Title |
---|
See also references of EP3347733A4 |
Also Published As
Publication number | Publication date |
---|---|
EP3347733B1 (en) | 2020-11-04 |
US20170074709A1 (en) | 2017-03-16 |
EP3347733A4 (en) | 2019-05-29 |
CN108139467B (en) | 2022-09-20 |
US10444055B2 (en) | 2019-10-15 |
EP3347733A1 (en) | 2018-07-18 |
CN108139467A (en) | 2018-06-08 |
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