EP2786168A1 - Dispositif de mesure optique - Google Patents

Dispositif de mesure optique

Info

Publication number
EP2786168A1
EP2786168A1 EP12798629.7A EP12798629A EP2786168A1 EP 2786168 A1 EP2786168 A1 EP 2786168A1 EP 12798629 A EP12798629 A EP 12798629A EP 2786168 A1 EP2786168 A1 EP 2786168A1
Authority
EP
European Patent Office
Prior art keywords
transmission
window
optical
measuring device
housing
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.)
Withdrawn
Application number
EP12798629.7A
Other languages
German (de)
English (en)
Inventor
Heiner Bayha
Peter Horvath
Jens Nicolai
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.)
Valeo Schalter und Sensoren GmbH
Original Assignee
Valeo Schalter und Sensoren GmbH
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 Valeo Schalter und Sensoren GmbH filed Critical Valeo Schalter und Sensoren GmbH
Publication of EP2786168A1 publication Critical patent/EP2786168A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
    • 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
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • G01S7/4813—Housing arrangements
    • 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
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
    • 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
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/93—Lidar systems specially adapted for specific applications for anti-collision purposes
    • G01S17/931—Lidar systems specially adapted for specific applications for anti-collision purposes of land vehicles

Definitions

  • the invention relates to an optical measuring device referred to in the preamble of claim 1 Art.
  • Detection and Ranging for vehicles to detect objects and / or obstacles in a surveillance area known.
  • These optical measuring devices determine the distance to objects and / or obstacles detected in the monitoring area with a light pulse transit time method.
  • the known optical measuring devices comprise a housing in which at least one optical transmitter for emitting at least one transmission beam and at least one optical receiver are arranged.
  • the receiver receives the light reflected at Whether ⁇ projects and / or obstacles rays and determined from the light pulse transit time the distance to the objects and / or obstacles.
  • the housing is closed by a cover plate and forms a transmission window and a receiving window, wherein the at least one transmission beam emerges from the housing through the transmission window, and the beam reflected by objects and / or obstacles enters the enclosure via the reception window.
  • the optical transmitter radiates the transmission beam via a rotating deflection mirror, wherein a Umlenkspie ⁇ gel deflected transmission beam is emitted via the transmission window to the outside. If the deflected transmitted beam of the ex ⁇ cover disk directly reflected, then passes this on the deflection mirror inward reflected transmission beam back, is again deflected by the deflection mirror and into another unwanted spatial direction as spurious via the transmit window radiated.
  • the cover of the optical measuring device can be arranged inclined ⁇ . By tilting the cover can be avoided ⁇ the that direct reflections ent ⁇ standing on the cover and reflected reflected beams are thrown back into the housing interior to ⁇ and sent out via the deflection mirror in an undesirable direction. Due to the inclination of the
  • the light beam at the deflecting mirror is reflected into the interior of the housing and "runs dead", so that no interference or interference signals are radiated.
  • As disadvantageous can be seen in the oblique position of the cover that this dictates the outer shape of the optical measuring device Due to the intended installation location of the optical measuring device in the vehicle, ie possibly even directly integrated in the radiator grille at the front part before the radiator, the space requirement of the optical measuring device should be minimized, in particular the optical measuring device should have an outer surface that is as flat as possible.
  • Patent EP 1 308 747 B1 describes a scanning optoelectronic distance sensor.
  • the described distance sensor comprises at least one laser as optical transmitter of pulsed electromagnetic radiation, at least one detector as optical receiver as well as a protective cover which is at least partially permeable to the electromagnetic radiation used, wherein the
  • Protective cover is movable and remain Stör Schemee the Schutzabde ⁇ ckung during the scanning outside a range of particular interest. Furthermore, the movable protective cover has a tilted opposite to the propagation direction of the electromagnetic radiation
  • the described distance sensor comprises at least one laser as optical transmitter, at least one detector as optical receiver and a deflection unit, which deflects a generated electromagnetic radiation ⁇ he electromagnetic radiation to the scene to be measured with a first mirror, and with a second mirror on the backscattered by laser pulses the at least one detector deflects.
  • the first and second mirrors are arranged on a common rotatable axle, which is driven by a drive unit.
  • the first mirror is arranged on a first holder and the second mirror is arranged axially spaced from the first mirror on a second holding ⁇ tion, wherein the drive unit is arranged between the two holders.
  • the at least one laser and the at least one detector with the associated electronics are arranged vertically.
  • the object of the invention is to develop an optical measuring device referred to in the preamble of claim 1, to the effect that a measuring device is provided with an outer surface as flat as possible and reduced interference signals.
  • This object is achieved by an optical measuring ⁇ device with the features of claim 1.
  • Other embodiments of the invention advantageously embodying features include the dependent claims.
  • the advantage achieved by the invention is that ei ⁇ ne outside of the cover can be arranged substantially perpendicular to the emission and only a transmission window over which the transmission radiation is emitted, having an inclination with a predetermined angle of inclination, so that the reflecting of the transmission window Beams are not reflected directly on the deflection mirror inside the optical measuring device.
  • An optical measuring device least comprises a housing in which at least one optical transmitter for emitting at least one transmitted beam and at least one optical receiver are arranged, wherein a cover closes off the housing and forming a transmit window and a receive window, wherein the at least one transmission ⁇ beam exits through the transmission window from the housing.
  • the inclination angle of the transmission window can be approximately 7 ° to a vertical axis.
  • jets can be effectively reduced.
  • the inclination of the disc of the transmission beam reflected on the transmission disc is reflected inside the optical measuring device past the deflection ⁇ mirror and "play dead run" so that no directly reflected transmission ⁇ beam exits the optical measuring device as spurious or spurious signal.
  • an effect can be obtained wel ⁇ cher an inclination of the entire cover panel would correspond to a tilt angle of 7 °.
  • the advantage of the inventive embodiments is that the existing space can be optimally utilized by the partial inclination.
  • the transmission window can be inclined inwards or outwards.
  • the outer surface of the optical measuring device can be flat be such that when arranged in the front region of a vehicle, the air flow, the flat outer surface constantly from
  • the tilt of the transmission window to the outside can be selected if the space requires it.
  • the inclination of the transmission window can be performed, for example, as a Verdi ⁇ ckung dependent on the inclination angle. This allows easy imple ⁇ wetting the inclined transmission window.
  • the thickening can be arranged for example on the inside and / or on the outside of the cover.
  • the transmission window and / or the receiving window can have an antireflection coating.
  • the electro-magnetic radiation ⁇ can be reduced in a disc passage advantageously intensity losses.
  • the light beam has a Refexions tent ⁇ Cä at each interface refraction of air / disk. 4 ⁇ 6 # means that with a disk penetration the light intensity decreases by approx. 8%. With an anti-reflective coating, these losses can be limited to about 1%.
  • the optical transmitter can be designed as a laser.
  • a laser makes it possible in an advantageous manner an excellent setting of the wavelength and / or pulse ⁇ duration and / or intensity and a good focusing of the outgoing transmit beams.
  • the optical measuring device can be arranged between the optical transmitter and the transmission window, an optical unit, which in particular as a plan field lens or as F-Thetalinse is executed.
  • an optical unit which in particular as a plan field lens or as F-Thetalinse is executed.
  • a beam correction can be carried out in vorteilhaf ⁇ ter manner.
  • the lens is designed for the focus of the exiting deflected transmit beam. As a result, the range of the laser scanner can be advantageously increased.
  • At least one transmitting mirror unit can be arranged on a rotatable axle in the housing, wherein the transmitting mirror unit comprises at least one transmitting deflecting mirror and a drive unit which drives the rotatable axle.
  • the inclined window offers advantages in order to avoid interference jets or interference signals.
  • the assignment of the rotor position to the reflected light radiation is missing when interference jets occur, which means that objects based on a rotor position are defined as being arranged on the left, even though they are located to the right of the optical measuring device. If direct reflections on the inside of the deflection mirror are avoided, additional calculation algorithms can advantageously be saved and the computing time can be reduced.
  • FIG. 1 shows a schematic perspective view of a
  • Embodiment of an optical measuring device according to the invention Embodiment of an optical measuring device according to the invention.
  • Fig. 2 is a schematic representation of an exemplary embodiment of a deflecting mirror for the inventiveness modern optical measuring device in FIG. 1.
  • Fig. 3 is a schematic rear perspective view of a cover plate from ⁇ optical for the inventive Messvor ⁇ direction in FIG. 1.
  • Fig. 4 is a front perspective view of the cover for the optical measuring device according to the invention from
  • FIG. 5 is a perspective sectional view of the cover along the line IV of FIG .. 3
  • Measuring device 1 a housing 3 and a cover 5, wel ⁇ che closes the housing and a transmission window 10 and a receiving window 7 is formed.
  • a transmission beam 22, 24 is emitted, for example, pulsed laser light.
  • the cover 5 is arranged in wesent ⁇ union perpendicular to the emission and the transmission window 10 has an inclination with a predetermined inclination angle.
  • the receiving window 7 receives a laser light reflected in a monitored area of objects. Over the measured time between the transmission of the transmission beam 22, 24 and the reception of the reflected transmission beam, the distance to objects or obstacles detected in a monitoring area is calculated according to a light pulse transit time method.
  • the housing also has an electrical connection 9, via which the optical measuring device 1 can be connected to other units in the vehicle and supplied with energy.
  • an optical transmitter 20 for emitting at least one transmission beam 22, 24 are arranged, wherein the at least one transmission beam 22, 24 exits through the transmission window 10 from the housing.
  • the optical transmitter 20 is designed for example as a laser.
  • at least one transmitting ⁇ mirror unit 31 is arranged on a rotatable axis.
  • the transmission mirror unit 31 has a first transmission deflection mirror 31.1 and a second transmission deflection mirror 31.2, wherein the transmission deflection mirrors 31.1, 31.2 run parallel to one another.
  • the Sendeumlenkspiegel 31.1, 31.2 are mounted on a mirror carrier 33 which is of a non-visible drive is trie ⁇ ben.
  • a transmission beam 22 emanating from the optical transmitter 20 is deflected by one of the transmission deflecting mirrors 31.1, 31.2, and the deflected transmission beam 24 is emitted to the outside via the transmission window 10. Without the inventive inclination of the transmission window 10 can be a part of the deflected beam 24 reflects ⁇ transmission 26 directly on the transmission window 10 degrees.
  • the reflected beam 26 is then deflected by one of the Sendeumlenk- mirror 31.1, 31.2 and radiated as deflected reflected interference beam 28 via the transmission window in an undesired spatial direction to the outside.
  • This deflection of the reflected beam 26 is avoided, in which the transmission window 10 is designed inclined by a predetermined inclination angle. In this way, the converted steering ⁇ th transmission beam 24 is reflected at the transmit window 10, the reflected beam 26 is not directly reflected on the deflecting mirror 31.1, 31.2 and "dead running". Therefore, no spurious 28 leave the optical measuring device 1 whose Rays reflected on objects and / or obstacles can adversely affect the evaluation result.
  • an optical unit is arranged between the optical transmitter 20 and the transmitting window 10, which focuses the deflected transmitting beam 24 and thus the range of the optical measuring device. tion 1 increased.
  • This optical unit can be designed, for example, as a plane field lens or as F-theta linseine.
  • an outer side 5.1 of the cover disk 5 is substantially perpendicular to the
  • Direction of emission and the transmission window 10 according to the invention has an inclination with a predetermined inclination angle.
  • the inclination amounts to supply angle of the transmission window 10 is preferably about 7 ° 16 to a vertical axis
  • the transmission window 10 is inclined in the illustrated embodiment inwards and has a dependent Nei ⁇ supply angle thickening which on an inner ⁇ page 5.2 of the cover 5 protrudes.
  • the outside 5.1 of the cover 5 in Be ⁇ rich of the transmission window 10 is inclined inwards, so that the Di ⁇ bridge of the cover 5 is tapered to the transmission window 10 back.
  • the outside 5.1 of the cover 5 is arranged flat and perpendicular to the emission direction. Only in the region of the transmission window 10, the cover 5 has an inclination, so that the radiation reflected on the transmitting window 10 beams 26 is not reflected directly on one of the deflecting mirrors 31.1, 31.2 who ⁇ .
  • the transmission festester 5 may be inclined outwardly and / or protrude outward.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

L'invention concerne un dispositif de mesure optique (1), comprenant un boîtier (3) dans lequel sont disposés au moins un émetteur optique (20) servant à rayonner un faisceau d'émission (22, 24) et au moins un récepteur optique. Un disque de recouvrement (5) ferme le boîtier et forme une fenêtre d'émission (10) ainsi qu'une fenêtre de réception (7), le ou les faisceaux d'émission (22, 24) sortant du boîtier par la fenêtre d'émission (10). Pour mettre à disposition un dispositif de mesure (1) ayant une surface extérieure (14) la plus plane possible et réduire les signaux parasites, dus entre autres à la réflexion du faisceau d'émission (22, 24) sur la fenêtre d'émission (10), la face extérieure (5.1) du disque de recouvrement (5) est disposée sensiblement perpendiculaire à la direction du rayonnement et la fenêtre d'émission (10) est réalisée avec une inclinaison qui présente un angle d'inclinaison (alpha) prédéfini.
EP12798629.7A 2011-11-29 2012-11-15 Dispositif de mesure optique Withdrawn EP2786168A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011119707A DE102011119707A1 (de) 2011-11-29 2011-11-29 Optische Messvorrichtung
PCT/EP2012/072715 WO2013079331A1 (fr) 2011-11-29 2012-11-15 Dispositif de mesure optique

Publications (1)

Publication Number Publication Date
EP2786168A1 true EP2786168A1 (fr) 2014-10-08

Family

ID=47326069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12798629.7A Withdrawn EP2786168A1 (fr) 2011-11-29 2012-11-15 Dispositif de mesure optique

Country Status (5)

Country Link
US (1) US9239260B2 (fr)
EP (1) EP2786168A1 (fr)
CN (1) CN104081221A (fr)
DE (1) DE102011119707A1 (fr)
WO (1) WO2013079331A1 (fr)

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CN104081221A (zh) 2014-10-01
US20140332676A1 (en) 2014-11-13
US9239260B2 (en) 2016-01-19
DE102011119707A1 (de) 2013-05-29
WO2013079331A1 (fr) 2013-06-06

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