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WO1998028598A1 - Sonde de detection de position magnetostrictive avec guide d'ondes reference par rapport a la pointe - Google Patents

Sonde de detection de position magnetostrictive avec guide d'ondes reference par rapport a la pointe Download PDF

Info

Publication number
WO1998028598A1
WO1998028598A1 PCT/US1996/020376 US9620376W WO9828598A1 WO 1998028598 A1 WO1998028598 A1 WO 1998028598A1 US 9620376 W US9620376 W US 9620376W WO 9828598 A1 WO9828598 A1 WO 9828598A1
Authority
WO
WIPO (PCT)
Prior art keywords
assembly
housing
waveguide
probe
tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1996/020376
Other languages
English (en)
Inventor
Richard S. Bulkowski
Mauro G. Togneri
David S. Nyce
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MTS Systems Corp
Original Assignee
MTS Systems Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MTS Systems Corp filed Critical MTS Systems Corp
Priority to PCT/US1996/020376 priority Critical patent/WO1998028598A1/fr
Priority to AU13404/97A priority patent/AU1340497A/en
Publication of WO1998028598A1 publication Critical patent/WO1998028598A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G01F23/30—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 floats
    • G01F23/64—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 floats of the free float type without mechanical transmission elements
    • G01F23/72—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 floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
    • 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
    • G01F23/296—Acoustic waves
    • G01F23/2962—Measuring transit time of reflected waves
    • G01F23/2963—Measuring transit time of reflected waves magnetostrictive
    • 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
    • G01F23/30—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 floats
    • G01F23/64—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 floats of the free float type without mechanical transmission elements
    • G01F23/68—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 floats of the free float type without mechanical transmission elements using electrically actuated indicating means

Definitions

  • the present invention relates to systems for measuring parameters with elongated waveguides in magnetostrictive displacement or distance measuring transducers, and more particularly to housings or probes for magnetostrictive transducers for measuring parameters
  • Magnetostrictive transducers having elongated waveguides that carry torsional strain
  • transducer at the head or mode converter (the converter that converts mechanical action or energy
  • the present invention relates to a rugged magnetostrictive position sensing probe with the waveguide referenced to the tip used for measuring parameters regarding the liquid contained in a storage vessel or other container.
  • the use of a waveguide referenced to the tip is especially useful for more accurate liquid level measurements.
  • the magnetostrictive sensing element is connected at the bottom of the probe and referenced to the bottom, or other reference point to which it may be connected, of the vessel into which the probe is installed. Distance measurements may be made to a float at the liquid surface and, as an option, float(s) at liquid interface(s), such as between the product in the vessel and the water level at the bottom of the vessel.
  • the implementation of the anchoring of the tip may be with any magnetostrictive position sensing device known in the prior art or yet to be determined. Thus no particular magnetostrictive
  • the housing or probe may be made of one or several materials which have different thermal expansion rates from the waveguide that is required for all magnetostrictive sensing devices and other housing materials.
  • long magnetostrictive sensor designs have incorporated a "dead space" at the tip of the probe to allow for differential thermal expansion of components of the probe.
  • the housing or probe for the magnetostrictive device anchors and references the magnetostrictive position sensing device, as more fully described below.
  • "dead space” is eliminated by connecting the waveguide directly or indirectly to the housing material at the bottom of the probe. Differential expansion is accommodated by a spring-loading or other compensation mechanism at the head of the device to allow the mode convertor of the sensor element to float with respect
  • the device has a flexible outer housing for magnetostrictive tank gauging, permitting ease of transport of very long devices. It is also prefabricated for watertight housings and requires no assembly or incorporation of the magnetostrictive sensing element in the assembly at the site except to affix the float, as is well known in the art. Thus, the possibility for leakage is diminished.
  • Fig. 1 A is a side, partial cross-sectional, partial cut away view of the bottom part of the complete sensing device of the preferred embodiment of the present invention
  • Fig. IB is a side, partial cross-sectional view of the middle part of the complete sensing device of the preferred embodiment of the present invention.
  • Fig. 1C is a side, partial cross-sectional view of the top part of the complete sensing device of the preferred embodiment of the present invention
  • Fig. 2 is an illustrative view of the sensing device of the preferred embodiment of the present invention showing multiple floats for level and interface measurements;
  • FIG. 3 is a detail view of Figure 1 A;
  • Fig. 4 is a detail view of Figure IB.
  • Fig. 5 is a bill of materials of Figures 1 A-1C and 2-4.
  • a probe or housing 15 of the present invention is shown in Figure 1A, IB and 1C to be
  • Probe 15 includes a transducer or sensing element assembly 10, which may be any transducer, including those of the prior art such as that shown in U.S. Patent No. 3,898,555 or any other transducer presently on the market or may be introduced in the future. Transducer 10 may be used for measuring displacements and/or distances or other measurements, and the housing or probe 15 of the present invention will be applicable to any of them.
  • the general type of transducer 10 should not be deemed as limiting the disclosure of the housing or probe 15, and the disclosure of the probe 15 should not be deemed to be limited by the disclosure for the waveguide construction and should not be deemed to be limited by the mode converter or other electronics. Further, the general nature of the transducer as electrically producing only the return pulse and interfacing on that basis with any electronics of a buyer or user of the device should not be deemed to be limiting the disclosure of the probe or housing 15.
  • a typical transducer or sensing element assembly 10 may be any transducer, including those of the prior art such as that shown in U.S
  • magnetostrictive transducer 10 that could be used with the preferred embodiment of the housing or probe 15 of the present invention is disclosed in U.S. Patent Application Serial No. 08/500,335, dated July 10, 1995, entitled “Waveguide Suspension Device and Modular Construction for Sonic Waveguides", filed by applicants Michael L. Gloden and Arnold Fred Sprecher, Jr., incorporated herein by reference.
  • the transducer 10 includes an elongated waveguide assembly enclosed in an insulating tubing 20.
  • Insulating tubing 20 helps to maintain the shape of the inner member (not shown) which is typically a woven tube to act as a cushion for the waveguides, and be made of a fine, hard material, or combination of materials, such as ceramic or glass with a strand count and weave configuration to act as a cushion for the waveguide 5.
  • Tubing 20 also protects the inner member from the outer flexible metal corrugated outer braid 45.
  • Tubing 20 is enclosed by a polymer or other flexible coating 21 and is provided this way by the supplier. The coating 21 acts as an insulator for shielding purposes.
  • Insulating tubing 20 which surrounds the waveguide 5 is enclosed by coaxial flexible metal corrugated outer braid 45 with a bellows 50 therebetween.
  • the inner sleeve or insulating tubing 20 acts as a cushion between the waveguide 5 and the flexible metal corrugated outer braid 45.
  • the bellows 50 helps in the sealing and to maintain the shape of the insulating tubing 20, and to protect tubing 20 from abrasion by the flexible, metal corrugated outer braid 45.
  • the waveguide assembly in the insulating tube 20 including an elongated interior waveguide 5, the return wire 6 also being coaxial with tubing 20.
  • a current is passed through the waveguide 5 and returns through a return wire 6 electrically connected to the waveguide 5.
  • at least one magnet located in a product or interface float 25 is mounted over the waveguide assembly and insulating tubing 20 by having an opening formed in the middle of the float 25, the opening being placed over and coaxial with outer braid 45.
  • the magnet interacts with the current pulse as more completely described in U.S. Patent 3,898,555.
  • a suitable mode converter (not shown) of any type known or to
  • the end plug 71 of the waveguide assembly is normally at the end of the waveguide assembly which would be near the bottom 57 of tank 40, if transducer 10 is being used for determining the level of liquid 37 in tank 40. As discussed in the Background, it is desired to
  • the bottom portion of probe 15 includes a ball mount 55 being secured by bolt 56 for attachment of a weight, magnet or gauge attachment 60.
  • Brackets (not shown) may be attached by welding or other suitable method on the bottom 57 of tank 40 while the tank 40 is not in service.
  • a weight or gauge attachment 60 or alternatively a magnet, are used to hold the bottom of probe 15 on the bottom 57 of tank 40.
  • the magnet if the material of tank 40 is also magnetic material, for example ferromagnetic material, it may not be necessary to weld a bracket or otherwise attach the weight 60 to the bottom 57 of tank 40. Magnetic forces may then hold weight 60 in place.
  • the bottom of probe 15 is maintained in contact and in fixed position with the bottom or reference 57 of the vessel 40 for accurate reading, rather than the top of the vessel 40.
  • the measurements may be referenced to the bottom of vessel 40 instead of the top of vessel 40.
  • This connection avoids the problem of probes of the prior art which were typically referenced to the top of the vessel 40, where changes in the vessel forces can change the dimensions of the vessel 40, yielding inaccurate level measurements. Accordingly, referencing readings from the bottom 57 of tank 40 provide more accurate readings of liquid level.
  • a ferrule 51 is welded and used to connect the bellows 50 and braid 45 to the tubing 65 and provide a leak proof seal.
  • An insulator 52 is used to isolate the exposed waveguides from the tubing 65.
  • the end plug 71 is also welded to tubing 65.
  • the flexible metal corrugated outer braid 45 provides a rugged, flexible outer protective cover for the probe 15. It allows complete assembly at the factory because a completed assembly can be coiled for shipment. This is because the tubing 20 is flexible with the outer braid 45 and the bellows 50. Also, the outer sheaving of the corrugated outer braid 45 is flexible and can be rolled because it is not pipe as in the prior art used in customer installations.
  • the insulating tubing 20 terminates at a transition tube 75 by adhesive on both sides.
  • Tube 75 is mounted coaxially with corrugated flexible metal outer braid 45 to allow connection to the remaining components of outer braid 45.
  • Transition or coupler tube 75 typically has a
  • tube 75 and retainer 85 are hollow in the center to permit the components interior to flexible metal corrugated braid 45 to continue through coupler tube 75, including the tube of transducer 10 which houses the waveguide 5.
  • the retainer 85 rests on a boss in a tubing adaptor 100 and is also oblong shaped to allow measuring devices and the return wire 6 to pass by.
  • a compression spring 90 is mounted to abut the upper end of spring retainer 86, such upper end acting as a shoulder for the lower end of compression spring 90. The upper end of compression spring 90 abuts a collar
  • the top of the tank 40 includes an opening 105 terminating at its upper end with a flange 110.
  • the bellows 50 and braid 45 are welded to an extension tube assembly of which tubing adaptor 100 is part.
  • Tube 115 mates with this assembly by means of a NPT thread.
  • Tube 115 rises upward therefrom through opening 105.
  • Tube 115 encloses compression spring 90 and transducer 10, as well as collar 95. Further, it encloses a flange 120 covering the lower end of bracket 125 which houses transducer 10 and receives the outer tube of transducer 10, bracket 125 having a housing 130 surrounding it, typically made of metal.
  • a wire assembly 30 is soldered to a PC board (not shown) and is mounted on bracket 125 and extends through housing 130 on the end of bracket 125 opposite to flange 120.
  • the wire assembly 30 is a coiled cord assembly which will allow for the vertical movement of the transducer 10.
  • a customer flange 140 is shown sized and mounted to connect to flange 110 and opening 145 is formed in flange 140 to permit the extension of tube 115 through flange 140.
  • Tube 115 is anchored with flange 140 by a compression fitting 150 which is connected by screwing or other means to flange 140.
  • the upper end tube 115 is mechanically connected to an electronics cavity 155 to which is connected the customer wiring termination housing 35. In this manner,
  • the conductors 30 extend through the entire length of tube 115 and terminate (not shown) in the electrical cavity 155.
  • the compression fitting 150 is adjustable to hold the probe 15 in place, while allowing adjustment by loosening the fitting 150, moving the probe 15 to the desired position, and then tightening the fitting 150.
  • the internal components of the gauge are electrically isolated or shielded from the outer tube 45 and bellows 50.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)

Abstract

Dispositif de détection de position magnétostrictif, dans lequel un ensemble sonde entourant un guide d'ondes (5) est ancré à une extrémité au fond (57) d'une cuve (40) et se termine en un ensemble transducteur fixé à la partie supérieure de la cuve (40). L'ensemble sonde compense le différentiel de couplage entre deux parties dudit ensemble. Le dispositif de détection comporte également un ou plusieurs flotteurs (25) qui entourent de manière mobile une partie de la sonde.
PCT/US1996/020376 1996-12-20 1996-12-20 Sonde de detection de position magnetostrictive avec guide d'ondes reference par rapport a la pointe Ceased WO1998028598A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US1996/020376 WO1998028598A1 (fr) 1996-12-20 1996-12-20 Sonde de detection de position magnetostrictive avec guide d'ondes reference par rapport a la pointe
AU13404/97A AU1340497A (en) 1996-12-20 1996-12-20 Magnetostrictive position sensing probe with waveguide referenced to tip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1996/020376 WO1998028598A1 (fr) 1996-12-20 1996-12-20 Sonde de detection de position magnetostrictive avec guide d'ondes reference par rapport a la pointe

Publications (1)

Publication Number Publication Date
WO1998028598A1 true WO1998028598A1 (fr) 1998-07-02

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PCT/US1996/020376 Ceased WO1998028598A1 (fr) 1996-12-20 1996-12-20 Sonde de detection de position magnetostrictive avec guide d'ondes reference par rapport a la pointe

Country Status (2)

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AU (1) AU1340497A (fr)
WO (1) WO1998028598A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001071748A1 (fr) * 2000-03-21 2001-09-27 Robert Bosch Gmbh Dispositif destine a alimenter un appareil consommateur hydraulique en milieu de pression
EP1775562A1 (fr) * 2005-10-11 2007-04-18 VEGA Grieshaber KG Dispositif de mesure de niveau de remplissage et/ou de niveau seuil muni d'un élément de connexion flexible
EP1992920A1 (fr) * 2007-05-16 2008-11-19 FAFNIR GmbH Procédé et dispositif destinés à la détection des états de remplissage de couches de liquides disposées les unes sur les autres
US7730778B2 (en) 2005-10-11 2010-06-08 Vega Grieshaber Kg Filling level and/or limit level measuring device with flexible connecting piece
DE102013009221A1 (de) 2013-05-31 2014-12-04 Fafnir Gmbh Vorrichtung zur magnetostriktiven Positionsmessung
CN105869360A (zh) * 2016-05-30 2016-08-17 国网山东省电力公司济南供电公司 一种油桶低液位报警装置
WO2019160444A1 (fr) * 2018-02-14 2019-08-22 Александр Петрович ДЕМЧЕНКО Capteur ultrasonique de niveau de liquide
CN110686752A (zh) * 2019-10-21 2020-01-14 文仕波 一种利用水流震荡进行测位的箱体液位计
DE102018216793A1 (de) * 2018-09-28 2020-04-02 Vega Grieshaber Kg Magnetisch abspannbare Messsonde
US10624862B2 (en) 2013-07-12 2020-04-21 Grünenthal GmbH Tamper-resistant dosage form containing ethylene-vinyl acetate polymer
US10788352B1 (en) 2018-04-30 2020-09-29 BearClaw Technologies, LLC Wi/Fi tank monitor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4939457A (en) * 1989-05-03 1990-07-03 Mts Systems Corporation Flexible tube sonic waveguide for determining liquid level

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4939457A (en) * 1989-05-03 1990-07-03 Mts Systems Corporation Flexible tube sonic waveguide for determining liquid level

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001071748A1 (fr) * 2000-03-21 2001-09-27 Robert Bosch Gmbh Dispositif destine a alimenter un appareil consommateur hydraulique en milieu de pression
EP1775562A1 (fr) * 2005-10-11 2007-04-18 VEGA Grieshaber KG Dispositif de mesure de niveau de remplissage et/ou de niveau seuil muni d'un élément de connexion flexible
US7730778B2 (en) 2005-10-11 2010-06-08 Vega Grieshaber Kg Filling level and/or limit level measuring device with flexible connecting piece
EP1992920A1 (fr) * 2007-05-16 2008-11-19 FAFNIR GmbH Procédé et dispositif destinés à la détection des états de remplissage de couches de liquides disposées les unes sur les autres
DE102013009221A1 (de) 2013-05-31 2014-12-04 Fafnir Gmbh Vorrichtung zur magnetostriktiven Positionsmessung
US10624862B2 (en) 2013-07-12 2020-04-21 Grünenthal GmbH Tamper-resistant dosage form containing ethylene-vinyl acetate polymer
CN105869360A (zh) * 2016-05-30 2016-08-17 国网山东省电力公司济南供电公司 一种油桶低液位报警装置
WO2019160444A1 (fr) * 2018-02-14 2019-08-22 Александр Петрович ДЕМЧЕНКО Capteur ultrasonique de niveau de liquide
US11280661B2 (en) 2018-02-14 2022-03-22 Aleksandr P. DEMCHENKO Ultrasonic fluid level sensor
US10788352B1 (en) 2018-04-30 2020-09-29 BearClaw Technologies, LLC Wi/Fi tank monitor
DE102018216793A1 (de) * 2018-09-28 2020-04-02 Vega Grieshaber Kg Magnetisch abspannbare Messsonde
CN110686752A (zh) * 2019-10-21 2020-01-14 文仕波 一种利用水流震荡进行测位的箱体液位计
CN110686752B (zh) * 2019-10-21 2020-09-25 江苏新晖测控科技有限公司 一种利用水流震荡进行测位的箱体液位计

Also Published As

Publication number Publication date
AU1340497A (en) 1998-07-17

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