SE1150921A1 - Method and apparatus for detecting the accumulation of material on the blade of a wind turbine and for determining the incoming wind conditions - Google Patents

Method and apparatus for detecting the accumulation of material on the blade of a wind turbine and for determining the incoming wind conditions Download PDF

Info

Publication number
SE1150921A1
SE1150921A1 SE1150921A SE1150921A SE1150921A1 SE 1150921 A1 SE1150921 A1 SE 1150921A1 SE 1150921 A SE1150921 A SE 1150921A SE 1150921 A SE1150921 A SE 1150921A SE 1150921 A1 SE1150921 A1 SE 1150921A1
Authority
SE
Sweden
Prior art keywords
blade
wind turbine
transmitting
accumulation
optical
Prior art date
Application number
SE1150921A
Other languages
Swedish (sv)
Inventor
Stellan Wickstroem
Original Assignee
Windvector Ab
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 Windvector Ab filed Critical Windvector Ab
Priority to SE1150921A priority Critical patent/SE1150921A1/en
Priority to EP12769424.8A priority patent/EP2764241A2/en
Priority to PCT/EP2012/069640 priority patent/WO2013050485A2/en
Publication of SE1150921A1 publication Critical patent/SE1150921A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
    • G01B11/046—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring width
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D15/00—De-icing or preventing icing on exterior surfaces of aircraft
    • B64D15/20—Means for detecting icing or initiating de-icing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
    • F03D17/001—Inspection
    • F03D17/003—Inspection characterised by using optical devices, e.g. lidar or cameras
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
    • F03D17/027—Monitoring or testing of wind motors, e.g. diagnostics characterised by the component being monitored or tested
    • F03D17/028—Blades
    • F03D17/0285—Surfaces thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/40—Ice detection; De-icing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/40—Ice detection; De-icing means
    • F03D80/405—Ice detection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/80—Diagnostics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/82—Forecasts
    • F05B2260/821—Parameter estimation or prediction
    • F05B2260/8211—Parameter estimation or prediction of the weather
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/80—Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/80—Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
    • F05B2270/804—Optical devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/80—Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
    • F05B2270/804—Optical devices
    • F05B2270/8042—Lidar systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Abstract

Föreliggande uppfinning hänför sig till ett förfarande för att detektera ansamling av material (201) på en vindturbins (104) blad (108a), varvid nämnda förfarande innefattar stegen att: sända (S1) en ljusstråle i riktning motvindturbinens (104) blad (108a-108c); mottaga (S2) reflekterat ljus från nämnda vindturbins (104) blad (108a); bestämma (S3) en momentan bredd av nämnda blad (108a) baserat på en detekterad intensitetsförändring över tid hos det reflekterade ljuset; och tillhandahålla (S4) en signal som indikerar ansamling av material (201) på nämnda blad (108a) om nämnda bestämda bredd på bladet (108a), baserat på den detekterade intensiteten övertid, är större än en känd bredd på bladet (108) utan ansamling av material (201).The present invention relates to a method for detecting accumulation of material (201) on the blades (108a) of a wind turbine (104a), said method comprising the steps of: transmitting (S1) a light beam in the direction of the blades (108a) of the wind turbine (104). 108c); receiving (S2) reflected light from the blades (108a) of said wind turbine (104); determining (S3) an instantaneous width of said blade (108a) based on a detected intensity change over time of the reflected light; and providing (S4) a signal indicating accumulation of material (201) on said blade (108a) if said determined width of the blade (108a), based on the detected intensity of overtime, is greater than a known width of the blade (108) without accumulation of material (201).

Claims (15)

10 15 20 25 30 12 PATENTKRAV10 15 20 25 30 12 PATENT REQUIREMENTS 1. Förfarande för att detektera ansamling av material (201) på en vindturbins (100) blad (108a), vilket förfarande innefattar stegen att: - sända (S1) en ljusstråle i riktning mot vindturbinens (100) blad (108a- 108c); - mottaga (S2) reflekterat ljus från nämnda blad (108a); - bestämma (S3) en bredd av nämnda blad (108a) baserat på en detekterad intensitetsförändring över tid hos det reflekterade ljuset; och -tillhandahålla (S4) en signal som indikerar ansamling av material (201) på nämnda blad (108a) om nämnda bredd på bladet (108a), bestämd baserat på den detekterade intensiteten över tid, är större än en känd bredd på bladet (108) utan ansamling av material (201).A method for detecting accumulation of material (201) on the blades (108a) of a wind turbine (100), the method comprising the steps of: - transmitting (S1) a light beam in the direction of the blades (108a-108c) of the wind turbine (100); - receiving (S2) reflected light from said blade (108a); determining (S3) a width of said blade (108a) based on a detected intensity change over time of the reflected light; and providing (S4) a signal indicating accumulation of material (201) on said blade (108a) if said width of the blade (108a), determined based on the detected intensity over time, is greater than a known width of the blade (108 ) without accumulation of material (201). 2. Förfarande enligt krav 1, varvid nämnda ljusstråle är en koherent laserstråle.The method of claim 1, wherein said light beam is a coherent laser beam. 3. Förfarande enligt krav 1, varvid nämnda material innefattar snö eller is.The method of claim 1, wherein said material comprises snow or ice. 4. Förfarande enligt något av föregående krav, vidare anordnat att detektera vindhastighet och vindriktning från ett avstånd avlägset från nämnda vindturbin (100).A method according to any one of the preceding claims, further arranged to detect wind speed and wind direction from a distance remote from said wind turbine (100). 5. Förfarande enligt något av föregående krav, varvid nämnda sändning av en ljusstråle och mottagning av reflekterat ljus utförs av ett ljusdetektions och avståndsmätningssystem (LIDAR).A method according to any one of the preceding claims, wherein said transmission of a light beam and reception of reflected light is performed by a light detection and distance measurement system (LIDAR). 6. Anordning (106) anordnad att detektera ansamling av material (102) på en vindturbins (100) blad (108a), varvid nämnda anordning (106) innefattar: 10 15 20 25 30 13 - en optisk sändare anordnad att sända en ljusstråle i riktning mot vindturbinens (100) blad (108a-108c), - en optisk mottagare anordnad att mottaga reflekterat ljus från vindturbinens (100) blad (108a-108c), - behandlingskrets anordnad att bestämma en bredd på nämnda blad (108a) baserat på en detekterad intensitetsvariation över tid hos nämnda reflekterade ljusstråle, och att tillhandahålla en signal indikativ för ansamlat material (201) på nämnda blad (108a) om bestämda bredden av nämnda blad (108a) baserad på detekterad intensitet över tid är större än en känd bredd på bladet (108a) utan ansamling av material (201).A device (106) arranged to detect accumulation of material (102) on a blade (108a) of a wind turbine (100), said device (106) comprising: an optical transmitter arranged to transmit a light beam in direction to the blades (108a-108c) of the wind turbine (100), - an optical receiver arranged to receive reflected light from the blades (108a-108c) of the wind turbine (100), - processing circuit arranged to determine a width of said blades (108a) based on a detected intensity variation over time of said reflected light beam, and providing a signal indicative of accumulated material (201) on said blade (108a) if the determined width of said blade (108a) based on detected intensity over time is greater than a known width of the blade (108a) without accumulation of material (201). 7. Anordning enligt krav 5, varvid nämnda ljusstråle är en koherent laser stråle.The device of claim 5, wherein said light beam is a coherent laser beam. 8. Vindturbin (100) innefattande anordningen (106) enligt krav 6 eller 7, anordnad i maskinhuset (104) hos vindturbinen (100).A wind turbine (100) comprising the device (106) according to claim 6 or 7, arranged in the engine housing (104) of the wind turbine (100). 9. LIDAR-system (500) för bestämning av vindhastighet och vindriktning vid en avlägsen plats (R), innefattande: - en koherent laser (502) för att tillhandahålla en sändstråle och en referensstråle; - ett optiskt system (514) för fokusering av sändstrålen vid den avlägsna platsen (R), där sändstrålen reflekteras och frekvensskiftas beroende på vindhastigheten på ett sådant sätt att en reflekterad frekvensskiftad stråle returneras i riktning mot det optiska systemet (514); - en mixeranordning (506) för att mixa den reflekterade frekvensskiftade strålen och referensstrålen för att tillhandahålla en kombinerad signal indikativ förfrekvensskillnad mellan den reflekterade strålen och referensstrålen; - en optisk brytare (512) anordnad mellan den koherenta Iasern (502) och det optiska systemet (514), varvid nämnda optiska brytare (512) är styrbar att ändra sändstrålens infallsposition på det optiska systemet (514) 10 15 20 25 30 14 vilket resulterar i en ändring av fokuseringsposition vid den avlägsna platsen (R); och - behandlingskrets (510) anknuten till mixern (506) och den optiska brytaren (512), och vidare anordnad att styra den optiska brytaren (512) att successivt ändra sändstrålens infallsposition på det optiska systemet (514) och att bestämma vindhastighet och vindriktning vid den avlägsna platsen (R) baserat på den kombinerade signalen för de olika fokuseringspositionerna vid den avlägsna platsen (R).A LIDAR system (500) for determining wind speed and wind direction at a remote location (R), comprising: - a coherent laser (502) for providing a transmitting beam and a reference beam; - an optical system (514) for focusing the transmitting beam at the remote location (R), the transmitting beam being reflected and frequency shifted depending on the wind speed in such a way that a reflected frequency shifted beam is returned in the direction of the optical system (514); a mixer device (506) for mixing the reflected frequency shifted beam and the reference beam to provide a combined signal indicative of pre-frequency difference between the reflected beam and the reference beam; an optical switch (512) disposed between the coherent laser (502) and the optical system (514), said optical switch (512) being controllable to change the incident position of the transmitting beam on the optical system (514), which results in a change of focusing position at the remote location (R); and - processing circuit (510) connected to the mixer (506) and the optical switch (512), and further arranged to control the optical switch (512) to successively change the incident position of the transmitting beam on the optical system (514) and to determine the wind speed and wind direction at the remote location (R) based on the combined signal for the different focusing positions at the remote location (R). 10. detektera ansamling av material (201) på en vindturbins (100) blad (108a- 108c). LIDAR-systemet (500) enligt krav 9, vidare anordnat att10. detecting accumulation of material (201) on the blades (108a-108c) of a wind turbine (100). The LIDAR system (500) of claim 9, further comprising 11. LIDAR-systemet (500) enligt krav 8 eller 9, och vidare anordnat att tillhandahålla ett flertal infallspositioner för sändstrålen, på ett sådant sätt att varje sändstråle är anordnad att fokuseras på en respektive punkt vid den avlägsna platsen (R).The LIDAR system (500) according to claim 8 or 9, and further arranged to provide a plurality of incident positions for the transmitting beam, in such a way that each transmitting beam is arranged to focus on a respective point at the remote location (R). 12. LIDAR-systemet (500) enligt något av krav 8 till 11, varvid optiska systemet (514) innefattar en optisk lins.The LIDAR system (500) of any of claims 8 to 11, wherein the optical system (514) comprises an optical lens. 13. är tillhandahållen genom den optiska linsen, varvid nämnda optiska lins är LIDAR-systemet (500) enligt krav 11, varvid nämnda sändstråle vidare anordnad att rikta nämnda sändstråle på en respektive fokuseringsposition vid den avlägsna platsen (R).Is provided by the optical lens, said optical lens being the LIDAR system (500) according to claim 11, wherein said transmitting beam is further arranged to direct said transmitting beam at a respective focusing position at the remote location (R). 14. LIDAR-systemet (500) enligt krav 12 eller 13, varvid nämnda flertal infallspositioner förser nämnda sändstrålar med orientering i ett väsentligen vertikalt eller horisontellt plan.The LIDAR system (500) of claim 12 or 13, wherein said plurality of incident positions provide said transmitting beams with orientation in a substantially vertical or horizontal plane. 15. LIDAR-systemet (500) enligt krav 14, varvid den optiska brytaren (512) vidare är anordnad att ändra konfiguration för sändstrålarna 15 från orientering i det väsentligen vertikala planet till orientering i det väsentligen horisontella planet, eller vice versa.The LIDAR system (500) of claim 14, wherein the optical switch (512) is further arranged to change configuration of the transmitting beams 15 from orientation in the substantially vertical plane to orientation in the substantially horizontal plane, or vice versa.
SE1150921A 2011-10-05 2011-10-05 Method and apparatus for detecting the accumulation of material on the blade of a wind turbine and for determining the incoming wind conditions SE1150921A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE1150921A SE1150921A1 (en) 2011-10-05 2011-10-05 Method and apparatus for detecting the accumulation of material on the blade of a wind turbine and for determining the incoming wind conditions
EP12769424.8A EP2764241A2 (en) 2011-10-05 2012-10-04 Method and device for detecting accumulation of material on a blade of a wind turbine and for determining upwind condition
PCT/EP2012/069640 WO2013050485A2 (en) 2011-10-05 2012-10-04 Method and device for detecting accumulation of material on a blade of a wind turbine and for determining upwind condition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1150921A SE1150921A1 (en) 2011-10-05 2011-10-05 Method and apparatus for detecting the accumulation of material on the blade of a wind turbine and for determining the incoming wind conditions

Publications (1)

Publication Number Publication Date
SE1150921A1 true SE1150921A1 (en) 2013-04-06

Family

ID=46982605

Family Applications (1)

Application Number Title Priority Date Filing Date
SE1150921A SE1150921A1 (en) 2011-10-05 2011-10-05 Method and apparatus for detecting the accumulation of material on the blade of a wind turbine and for determining the incoming wind conditions

Country Status (3)

Country Link
EP (1) EP2764241A2 (en)
SE (1) SE1150921A1 (en)
WO (1) WO2013050485A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015058209A1 (en) 2013-10-18 2015-04-23 Tramontane Technologies, Inc. Amplified optical circuit
JP6429723B2 (en) * 2015-05-11 2018-11-28 三菱電機株式会社 Laser radar apparatus and observation method
CN106569290A (en) * 2016-11-11 2017-04-19 天津中新安德科技有限公司 Meteorological data acquisition system
EP3339640A1 (en) 2016-12-21 2018-06-27 Vestas Wind Systems A/S Control system for a wind turbine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20206704U1 (en) * 2002-04-27 2002-08-22 Diwald Werner Ice sensor for wind turbines
CN102439296B (en) * 2009-06-26 2014-05-28 三菱重工业株式会社 Wind driven generator and method of controlling same
CN102753818A (en) * 2009-07-23 2012-10-24 利瓦斯有限责任公司 Detection of ice on airfoils

Also Published As

Publication number Publication date
EP2764241A2 (en) 2014-08-13
WO2013050485A3 (en) 2013-06-20
WO2013050485A2 (en) 2013-04-11

Similar Documents

Publication Publication Date Title
CN205209357U (en) Low latitude security protection system based on high -power laser in succession
SE1150921A1 (en) Method and apparatus for detecting the accumulation of material on the blade of a wind turbine and for determining the incoming wind conditions
EP2518529A3 (en) Apparatus and method for detecting aircraft icing conditions
CN102782505B (en) A wind turbine optical wind sensor
CN102221450B (en) Tracking-pointing deviation measurement device for laser system
US20160223674A1 (en) Wind measurement lidar
WO2014000744A3 (en) Wind turbine blade vibration detection and radar calibration
WO2007084209A3 (en) Single aperture multiple optical waveguide transceiver
GB2484641A (en) Method for optically scanning and measuring an object
CN101825647A (en) Wind velocity measurement system and method
JP2010249818A (en) Laser beam image contrast enhancement
WO2014178376A1 (en) Laser radar device
CN104129616B (en) Based on the conveyer band discerption detecting device of multiple spot laser ranging
CN105005054A (en) Non-scanning continuous optical coherence speed measurement laser radar based on time-division multiplexing
CN104865552A (en) Visible light positioning system and method based on two image sensors
CN203422069U (en) Multi-optical axis consistency detection device of platform photoelectric instrument
WO2011124169A3 (en) Method, apparatus and system for detecting type of network equipment
RU2013131077A (en) METHOD FOR DETECTING A VEHICLE WHEEL
US11150535B2 (en) Apparatus and method for transmitting light in different directions by changing wavelength of the light
CN102636259B (en) Multi-aperture optical signal detection system and method
RU2007149575A (en) GUIDANCE SIGHT-INSTRUMENT WITH LASER RANGE
CN103188013A (en) Method and device for detecting length of single channel light wave
JP2012039285A (en) Optical communication device and optical communication method
US9420191B2 (en) Sensor for capturing a moving material web
JP2009098003A (en) Vibration displacement detecting device and method of detecting displacement and vibration

Legal Events

Date Code Title Description
NAV Patent application has lapsed