WO1988002473A1 - Dispositif servant a determiner la position d'un corps mobile et procede d'utilisation dudit dispositif - Google Patents

Dispositif servant a determiner la position d'un corps mobile et procede d'utilisation dudit dispositif Download PDF

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Publication number
WO1988002473A1
WO1988002473A1 PCT/NO1987/000064 NO8700064W WO8802473A1 WO 1988002473 A1 WO1988002473 A1 WO 1988002473A1 NO 8700064 W NO8700064 W NO 8700064W WO 8802473 A1 WO8802473 A1 WO 8802473A1
Authority
WO
WIPO (PCT)
Prior art keywords
reflector
signal
rotation
determining
angle
Prior art date
Application number
PCT/NO1987/000064
Other languages
English (en)
Inventor
Jens M. Hovem
Kurt-Even Kristensen
Original Assignee
Stiftelsen For Industriell Og Teknisk Forskning Ve
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 Stiftelsen For Industriell Og Teknisk Forskning Ve filed Critical Stiftelsen For Industriell Og Teknisk Forskning Ve
Publication of WO1988002473A1 publication Critical patent/WO1988002473A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/48—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation means
    • 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/18—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves
    • G01S5/186—Determination of attitude

Definitions

  • the invention concerns a device presented in accordance with the introduction to Claim of Patent 1, to determine the position of a moveable body which is moved along a predetermined path, particularly by rotation.
  • the main purpose of the invention is to design a device for determining the position of moveable parts, in particular a spindle which rotates or which can be turned through a certain angle. It is a particular aim to create such a device without moving parts, and thus reduce the need for bringing electric wires into the area with the consequent risk of explosion.
  • One application might be, for example, on connection with off-shore installations.
  • the invention comprises a device which is described in the characterising part of the Claim of Patent 1.
  • Such measuring equipment is particularly suited for determining the angular position or rotation position of spindles, eg on valves and other operating units where a component is turned or is to be turned through an angle of less than 360o.
  • the invention can, however, also be used for measuring the position of machine parts etc which are moved rectilinearly.
  • fig.1 shows a schematic portrayal of a measurement arrangement with an attached block diagram for the signal processing circuit.
  • fig.2 shows a vertical cross-section in schematic rendering through a measurement unit in accordance with the invention intended for mounting on a spindle
  • fig.3 shows the cross-section through a mechanism with rectilinear movement developed in accordance with thre imventi ⁇ n..
  • a spindle 11 which can belong to a arbitrary machine part which is intended to rotate through a limited angle, eg 60o. It could be, for example, a spindle on a valve, or a manipulation tool.
  • a reflector 12 is fastened on a suitable mounting 13.
  • the reflector 12 is designed for reflection of acoustic waves.
  • the reflector 12 can be made of rust-free or inert material with a rectangular frontal cross-section.
  • the mounting can, for example, be screwed to the spindle 11.
  • a row 14 of electro-acoustic conversion elements, 15a-n is placed (rotational elements or transducers).
  • Row 14 has geometric circular arc form with a centre which coincides with the spindle ll's rotational axis 16.
  • the conversion elements 15 a...n which can be piezoelectric, are directional and have maximum sensitivity direction towards the rotation axis 16.
  • the conversion elements are each connected to a coupling circuit 17, which is connected to a signal generator 18 on the one side, and to a signal processing circuit 19 on the other.
  • a terminal 20 is shown in this example connected to the signal processing circuit 19, which can be micro-processor based.
  • the measurement of the spindle ll's angular displacement is based on the principle that each one of the convertors 15a...n sends out a signal and that the reflected signal which is registered in the other converters is transmitted to the signal processing circuit 19.
  • Determining the position requires two operations: first the angle interval which the reflector 12 finds itself in is determined, ie which of the conversion elements 15a...n the reflector finds itself between. Thereafter an exact position in this interval is determined.
  • the position of the relector is found between the elements in the pair of elements which have the highest level of received signal.
  • the accuracy is dependent on the relative distance between the elements, the directionality of the elements and the reflector, the signal/noise-ratio and the accuracy of the digitisation in the signal processing.
  • the position will be given the more accurately the greater the slope in the linear approximation, and the accuracy will be the same over the linear area.
  • FIG.2 shows an example of an performance graph of the invention designed for placing on a spindle.
  • a rotatable rod is mounted, which is supported on bearings 23 and 24 respectively on opposite sides of the casing.
  • the rod 22 is taken through the lower bearing 24 in the figure and located with a coupling flange 25 outside the casing.
  • the casing 21 is also located with two anchor pads, 26 and 27 respectively, for mounting on a machine not shown, valve or similar.
  • rod 22 being taken through the lower bearing 24
  • magnetic coupling for example, between the spindle, the axle for which the position is to be decided, and the mesuring unit's axle could be considered.
  • the casing 21 is coated inside with a lining of absorbant material, eg reinforced foam rubber.
  • a space, 29, is provided outside the lining 28 for the parts of the signal processing circuits etc which it is expedient to site at the place of use.
  • the main elements in the equipment are a reflector 30 which is mounted on a radially-spoked supporting axle 31 fastened to the rod 22.
  • a row 14 with conversion elements 15a...n is fastened to the casing 21's wall internally on the lining 28, and radially out from the reflector 30.
  • the interior of the casing 21 is filled with a suitable liquid, eg castor oil 32.
  • the reflector can be replaced by a pulsating element fastened to the spindle or the piston rod, and which emits acoustic signals to the detector rows. These will then be used only as receiver elements.
  • the signal processing procedure for determining the position will be as in the case with the reflector, while the analogue electronic-circuits which are necessary for sending out and receiving pulses, will be simpler. However, the system's reliabilty is reduced and also its safety, because an electric cable must be carried out to a moving part.
  • the invention can also be used to measure linear displacement as illustrated in fig.3 Here a section of a hydraulic cylinder 33 with a piston rod 34 is shown. A rectilinear row of conversion elements 35 is built into the wall, while a reflector 36 is attached to the piston rod 34. The position of the reflector 36 can be found by the corresponding method, as described above.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)

Abstract

Le dispositif décrit sert à déterminer la position d'un corps mobile (11), en particulier son déplacement angulaire. Un élément réflecteur (12) est fixé au corps et une rangée d'émetteurs/récepteurs acoustiques (15a...n) est disposée selon un arc circulaire dont le centre de courbure coïncide avec l'axe de rotation (16) du corps. Ces composants sont connectés respectivement à un générateur de signaux (18) destiné à produire la pulsation séquentielle des éléments émetteurs et à un circuit de traitement de signaux (19) servant à déterminer les maxima de réflection et le déplacement angulaire.
PCT/NO1987/000064 1986-10-01 1987-10-01 Dispositif servant a determiner la position d'un corps mobile et procede d'utilisation dudit dispositif WO1988002473A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO863906A NO863906L (no) 1986-10-01 1986-10-01 Anordning for aa bestemme posisjon til et bevegelig legeme som forflyttes etter en forutbestemt bane, saerlig ved rotasjon.
NO863906 1986-10-01

Publications (1)

Publication Number Publication Date
WO1988002473A1 true WO1988002473A1 (fr) 1988-04-07

Family

ID=19889256

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1987/000064 WO1988002473A1 (fr) 1986-10-01 1987-10-01 Dispositif servant a determiner la position d'un corps mobile et procede d'utilisation dudit dispositif

Country Status (2)

Country Link
NO (1) NO863906L (fr)
WO (1) WO1988002473A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3823490A1 (de) * 1988-07-11 1990-02-01 Ingbuero Fuer Elektro Mechanis Verfahren und einrichtung zur elektroakustischen messung der trefferlage von geschossen an fliegenden zielen
DE3832700A1 (de) * 1988-09-27 1990-03-29 Rump Elektronik Tech Apparat und verfahren zum zwecke des kollisions- und auffahrschutzes von fahrzeugen
DE4109555A1 (de) * 1991-03-22 1992-09-24 Stratec Elektronik Gmbh Verfahren zur ueberpruefung der lage eines pruefobjekts an einem traeger und einrichtung zur durchfuehrung des verfahrens

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121855A (en) * 1959-11-02 1964-02-18 Atlas Werke Ag Method and apparatus of measuring direction and distances of reflecting objects
US3940609A (en) * 1974-10-09 1976-02-24 Johnstun Dick E Angular position measuring apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121855A (en) * 1959-11-02 1964-02-18 Atlas Werke Ag Method and apparatus of measuring direction and distances of reflecting objects
US3940609A (en) * 1974-10-09 1976-02-24 Johnstun Dick E Angular position measuring apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3823490A1 (de) * 1988-07-11 1990-02-01 Ingbuero Fuer Elektro Mechanis Verfahren und einrichtung zur elektroakustischen messung der trefferlage von geschossen an fliegenden zielen
DE3832700A1 (de) * 1988-09-27 1990-03-29 Rump Elektronik Tech Apparat und verfahren zum zwecke des kollisions- und auffahrschutzes von fahrzeugen
DE4109555A1 (de) * 1991-03-22 1992-09-24 Stratec Elektronik Gmbh Verfahren zur ueberpruefung der lage eines pruefobjekts an einem traeger und einrichtung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
NO863906D0 (no) 1986-10-01
NO863906L (no) 1988-04-05

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