CA2730161C - Procede et appareillage pour la detection optique du niveau de surfaces de fluide sous agitation - Google Patents

Procede et appareillage pour la detection optique du niveau de surfaces de fluide sous agitation Download PDF

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Publication number
CA2730161C
CA2730161C CA2730161A CA2730161A CA2730161C CA 2730161 C CA2730161 C CA 2730161C CA 2730161 A CA2730161 A CA 2730161A CA 2730161 A CA2730161 A CA 2730161A CA 2730161 C CA2730161 C CA 2730161C
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Canada
Prior art keywords
top surface
optical
signal
waveforms
fluid
Prior art date
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Active
Application number
CA2730161A
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English (en)
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CA2730161A1 (fr
Inventor
Francois Babin
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.)
Leddartech Holdings Inc
Original Assignee
Leddartech Inc
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Publication date
Application filed by Leddartech Inc filed Critical Leddartech Inc
Publication of CA2730161A1 publication Critical patent/CA2730161A1/fr
Application granted granted Critical
Publication of CA2730161C publication Critical patent/CA2730161C/fr
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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
    • G01F23/22—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
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • 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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/486—Receivers
    • G01S7/487—Extracting wanted echo signals, e.g. pulse detection
    • 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/486—Receivers
    • G01S7/487—Extracting wanted echo signals, e.g. pulse detection
    • G01S7/4876—Extracting wanted echo signals, e.g. pulse detection by removing unwanted signals

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

L'invention porte sur un procédé et un appareillage pour la mesure optique sans contact du niveau d'un fluide stocké dans une cuve ou un récipient, la surface du fluide étant éventuellement agitée. Le procédé consiste en le traitement numérique des formes d'onde du signal numérisé générées par un appareil lidar, sur la base d'un schéma de modulation à temps de vol pulsé. Une étape clé du traitement numérique réside dans le calcul d'une forme d'onde dans laquelle chaque point de données est obtenu à partir d'un estimateur statistique de la variabilité de l'écho du signal d'amplitude mesurée à sa distance de l'appareil lidar correspondant au rang du point de données dans la forme d'onde. L'estimateur statistique est de préférence l'écart-type. Par utilisation d'un estimateur statistique de la variabilité de l'amplitude du signal capté, l'écho de signal spécifique renvoyé par la surface d'un fluide agité peut être fortement amplifié par comparaison avec les échos de signaux renvoyés d'un obstacle ou d'un milieu quelconque qui pourrait être présent le long du trajet du faisceau optique émis par l'appareil lidar. Le procédé permet ainsi une récupération efficace de l'écho de signal utile, à partir duquel le niveau de la surface du fluide peut être mesuré de manière fiable et plus précise, en particulier lorsque l'écho du signal utile risque d'être noyé dans l'écho de signal fort renvoyé d'un quelconque milieu de diffusion ou d'absorption optique, qui remplirait le volume de la cuve au-dessus de la surface du fluide.
CA2730161A 2008-07-10 2008-07-10 Procede et appareillage pour la detection optique du niveau de surfaces de fluide sous agitation Active CA2730161C (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA2008/001275 WO2010003210A1 (fr) 2008-07-10 2008-07-10 Procédé et appareillage pour la détection optique du niveau de surfaces de fluide sous agitation

Publications (2)

Publication Number Publication Date
CA2730161A1 CA2730161A1 (fr) 2010-01-14
CA2730161C true CA2730161C (fr) 2013-12-10

Family

ID=41506606

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2730161A Active CA2730161C (fr) 2008-07-10 2008-07-10 Procede et appareillage pour la detection optique du niveau de surfaces de fluide sous agitation

Country Status (2)

Country Link
CA (1) CA2730161C (fr)
WO (1) WO2010003210A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010013751A1 (de) * 2010-03-31 2011-10-06 Baumer Innotec Ag Vorrichtung zur Laufzeitmessung mit Pulsformung zur Entfernungsbestimmung
DE102012108462A1 (de) * 2012-09-11 2014-03-13 Endress + Hauser Gmbh + Co. Kg Verfahren, Vorrichtung und System zur Laserbasierten Bestimmung des Füllstands eines Füllguts in einem Behälter
JP6143879B2 (ja) * 2012-12-10 2017-06-07 フジツウ テクノロジー ソリューションズ インタレクチュアル プロパティ ゲーエムベーハー コンピュータシステムのセンサデバイス、センサデバイスを有するコンピュータシステム及びセンサデバイスの作動方法
DE102013114737A1 (de) * 2013-12-20 2015-06-25 Endress + Hauser Gmbh + Co. Kg Laser-basierte Füllstandsmessvorrichtung
DE102014111550A1 (de) * 2014-08-13 2016-02-18 Inntal systemEnergie GmbH System zur Bestimmung des Füllstandes eines Schüttgutlagers
FR3073940B1 (fr) 2017-11-20 2019-11-08 Office National D'etudes Et De Recherches Aerospatiales Dispositif optique autocalibrant pour la mesure sans contact du niveau d'un liquide
FR3106657B1 (fr) * 2020-01-24 2022-03-25 Lesaffre & Cie Dispositif capteur pour mesurer le niveau de matière contenue dans un conteneur

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5194747A (en) * 1991-10-21 1993-03-16 Midland Manufacturing Corp. Liquid level gauge comparing moldulations of incident and reflected loser beams
US6040897A (en) * 1998-04-29 2000-03-21 Laser Technology, Inc. Remote sensor head for laser level measurement devices
ATE411511T1 (de) * 2005-12-09 2008-10-15 Unomedical As Vorrichtung zur volumenmessung einer flüssigkeit in einem gefäss

Also Published As

Publication number Publication date
CA2730161A1 (fr) 2010-01-14
WO2010003210A1 (fr) 2010-01-14

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