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WO1996004524A1 - Methode de compensation des erreurs de mesure d'un capteur d'inclinaison - Google Patents

Methode de compensation des erreurs de mesure d'un capteur d'inclinaison Download PDF

Info

Publication number
WO1996004524A1
WO1996004524A1 PCT/FI1994/000332 FI9400332W WO9604524A1 WO 1996004524 A1 WO1996004524 A1 WO 1996004524A1 FI 9400332 W FI9400332 W FI 9400332W WO 9604524 A1 WO9604524 A1 WO 9604524A1
Authority
WO
WIPO (PCT)
Prior art keywords
bubble
level
tilt
output
amplifier
Prior art date
Application number
PCT/FI1994/000332
Other languages
English (en)
Inventor
Viljo Lukkarinen
Original Assignee
Nofa Industrial Oy
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 Nofa Industrial Oy filed Critical Nofa Industrial Oy
Priority to PCT/FI1994/000332 priority Critical patent/WO1996004524A1/fr
Publication of WO1996004524A1 publication Critical patent/WO1996004524A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels
    • G01C9/02—Details
    • G01C9/06—Electric or photoelectric indication or reading means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels
    • G01C9/02—Details
    • G01C9/06—Electric or photoelectric indication or reading means
    • G01C2009/062—Electric or photoelectric indication or reading means capacitive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels
    • G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
    • G01C2009/182—Measuring inclination, e.g. by clinometers, by levels by using liquids conductive

Definitions

  • This invention relates to a bubble level based tilt sensor, where the impacts of temperature variations and impacts of variations in the bubble size are compensated for in a circuit that measures the rate of tilt by means of a method according to patent claim 1.
  • the major advantage of the invention can be considered the fact that by means of the configuration set forth in this method, the tilt rates are almost completely independent of the variations in the supply voltage and variations in bubble size and, on the other hand, of the variations in the bubble level temperature during measuring. For instance, when the bubble size diminishes, the output levels of the sensor sig ⁇ nals and the differential amplifier rise and, simultaneously, the refence levels U3 and U4 of the comparison amplifiers grow just as much as to remain in right relation while the bubble size changes all the time along with the temperature.
  • the method is ideal since the reference levels change with absolute dependency according to the variation of the bubble size or the variation of supply voltage compared, for intance, with a method, where one would try to make compensation by NTC resistors or similar components, the matching of whose heat mass and performance curves with the masses and properties of the bubble level tube/fluid would be complicated and imper ⁇ fect.
  • a conductive strip 2 is fixed and in the upper surface there are strips 4 and 5.
  • the supply voltage is U.
  • the position of bubble changes with regard to strips 4 and 5 inducing a difference in the capacitance between condensators formed by means of said strips.
  • From strips 4 and 5 signals depart toward differential resistor VI,V2.
  • the resistor is "floating" depending on the voltage levels from strips 4 and 5.
  • the signals are rectified by diods DI and D2.
  • Rl and R2 are dumping resistors of the sensor capacitances and D3,D4 are the dumping diods.
  • Cl and C2 are charging condensators and resistors R3 and R4 dump-ing resistors of the charging condensators.
  • the differential amplifier VI,V2 amplifies the output signals Ul and U2 that start forward to comparison rectifiers V3 and V4.
  • Ml and M2 are meters of the tilt rate and can be added to the configur ⁇ ation.
  • the amplification of the differential amplifier VI,V2 is set by restrictors R5,R6,R7.
  • Reference voltages U3 and U4 of comparison amplifiers V3 and V4 are taken, by means of resistance coupling R8,R9 and RIO, Rll from supply voltage U and from output voltages Ul and U2 of the differential ampli ⁇ fier. With the bubble level in tilted position, output data is attained from the comparison amplifiers V3 and V4 independent of the supply voltage and the bubble size.
  • the con ⁇ figuration a ⁇ td method can be applied to compensation of measuring errors of tiltmeters.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

Méthode d'élimination des erreurs de mesure induites par des fluctuations de température ou des variations du volume d'une bulle à niveau (6) dans un instrument de mesure d'inclinaison. La bulle est remplie d'un fluide conducteur (3) de sorte que, en rapport avec le niveau de la bulle, des condensateurs (2, 4) et (2, 5) revélateurs de l'inclinaison et comparables entre eux produisent des tensions en sortie qui sont comparées et qui fournissent des données d'inclinaison. Le degré d'inclinaison, essentiellement indépendant à la fois de la température du niveau à bulle et de la dimension de la bulle (6), est élaboré à partir des tensions agissant entre les tensions de sortie (U1, U2) de l'amplificateur différentiel (V1, V2) servant d'amplificateur des signaux du capteur (4, 5), et la tension d'alimentation (u), grâce à un couplage diviseur de tension, de telle sorte que les entrées de l'amplificateur de comparaison (V3, V4) sont reliées aux sorties (U1 et U2) de l'amplificateur différentiel précité, pour comparer le niveau de ladite sortie avec le niveau (U3) ou (4) établi au moyen d'un autre niveau de sortie et d'une autre tension d'alimentation (U).
PCT/FI1994/000332 1994-08-01 1994-08-01 Methode de compensation des erreurs de mesure d'un capteur d'inclinaison WO1996004524A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/FI1994/000332 WO1996004524A1 (fr) 1994-08-01 1994-08-01 Methode de compensation des erreurs de mesure d'un capteur d'inclinaison

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI1994/000332 WO1996004524A1 (fr) 1994-08-01 1994-08-01 Methode de compensation des erreurs de mesure d'un capteur d'inclinaison

Publications (1)

Publication Number Publication Date
WO1996004524A1 true WO1996004524A1 (fr) 1996-02-15

Family

ID=8556584

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1994/000332 WO1996004524A1 (fr) 1994-08-01 1994-08-01 Methode de compensation des erreurs de mesure d'un capteur d'inclinaison

Country Status (1)

Country Link
WO (1) WO1996004524A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001086230A1 (fr) * 2000-05-05 2001-11-15 Ahmet Yalcin Inclinometre a compensation de temperature
US7497021B2 (en) * 2006-01-24 2009-03-03 Trimble Navigation Limited Multi-axis bubble vial device
US9459121B2 (en) 2013-05-21 2016-10-04 DigiPas USA, LLC Angle measuring device and methods for calibration

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990011489A1 (fr) * 1989-03-21 1990-10-04 Zircon International, Inc. Niveau electronique capacitif avec selection automatique d'electrode
US5146688A (en) * 1991-01-28 1992-09-15 Rockwell International Corporation Low power tiltmeter electronics with compensation for bubble level fluid temperature
US5259118A (en) * 1989-03-21 1993-11-09 Zircon Corporation Electronic capacitive level with display showing direction of rotation to achieve level/plumb
FI930419A7 (fi) * 1993-02-01 1994-08-02 Nofa Ind Oy Menetelmä mittausvirheiden kompensoimiseksi kaltevuusanturissa

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990011489A1 (fr) * 1989-03-21 1990-10-04 Zircon International, Inc. Niveau electronique capacitif avec selection automatique d'electrode
US5259118A (en) * 1989-03-21 1993-11-09 Zircon Corporation Electronic capacitive level with display showing direction of rotation to achieve level/plumb
US5146688A (en) * 1991-01-28 1992-09-15 Rockwell International Corporation Low power tiltmeter electronics with compensation for bubble level fluid temperature
FI930419A7 (fi) * 1993-02-01 1994-08-02 Nofa Ind Oy Menetelmä mittausvirheiden kompensoimiseksi kaltevuusanturissa

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001086230A1 (fr) * 2000-05-05 2001-11-15 Ahmet Yalcin Inclinometre a compensation de temperature
US7497021B2 (en) * 2006-01-24 2009-03-03 Trimble Navigation Limited Multi-axis bubble vial device
US9459121B2 (en) 2013-05-21 2016-10-04 DigiPas USA, LLC Angle measuring device and methods for calibration

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