EP3055682A1 - Dispositif et procédé pour mesurer des vitres, en particulier des pare-brises de véhicules - Google Patents

Dispositif et procédé pour mesurer des vitres, en particulier des pare-brises de véhicules

Info

Publication number
EP3055682A1
EP3055682A1 EP14772384.5A EP14772384A EP3055682A1 EP 3055682 A1 EP3055682 A1 EP 3055682A1 EP 14772384 A EP14772384 A EP 14772384A EP 3055682 A1 EP3055682 A1 EP 3055682A1
Authority
EP
European Patent Office
Prior art keywords
light
light sensor
disk
brightness
light beam
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.)
Ceased
Application number
EP14772384.5A
Other languages
German (de)
English (en)
Inventor
Bernd GRUBERT
Michael DAHL
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.)
Moeller Wedel Optical GmbH
Original Assignee
Moeller Wedel Optical 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 Moeller Wedel Optical GmbH filed Critical Moeller Wedel Optical GmbH
Publication of EP3055682A1 publication Critical patent/EP3055682A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • 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
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • G01N2021/9586—Windscreens

Definitions

  • the invention relates to a device and a method for measuring discs, in particular windscreen discs of vehicles.
  • the device comprises a
  • Light source and a light sensor which are arranged so that an outgoing light beam from the light source passes through the disc and hits the light sensor. If a light beam strikes a disc at an angle of incidence which forms an angle not equal to 0 ° with the disc normal, an internal reflection can occur in the disc which splits the light beam into a primary beam and a secondary beam. An observer looking through the window at the light source sees a double image of the light source. A double image arises in particular if the disk is wedge-shaped in the relevant area, ie the two outer surfaces are thus not parallel to one another, or if the disk has a curvature there.
  • Such double images are perceived as disturbing, for example, in windshields of vehicles when the light of an oncoming vehicle is twice as visible in the dark. It is known to measure windshields with regard to the formation of double images.
  • the double image angle that is the angle which the primary beam and the secondary beam enclose with one another, is of interest.
  • a light beam is directed through the pane onto a light sensor and determines how large the distance between the primary beam and the secondary beam is on the light sensor.
  • the invention is based on the object to present a device with which the double images generated by a disk can be measured more easily.
  • the object is achieved with the features of claim 1.
  • Advantageous embodiment are specified in the subclaims.
  • the light sensor has a dynamic range of more than 8 bits with linear resolution.
  • Dynamic range refers to the quotient of the highest brightness and the smallest brightness that can be detected with the light sensor. Detects the light sensor, the brightness digitally with a resolution of 8 bits, are 256 ⁇ brightness levels are available. If the light sensor assumes a linear resolution, there is a proportional relationship between the brightness and the brightness levels. The difference in brightness between two adjacent brightness ⁇ step is thus the same as at high luminance at a low brightness substantially. With 8 bits with linear resolution theoretically a dynamic range of 256 is available. Practically, the dynamic range is much smaller because it is not possible to distinguish small brightness from noise. In fact, with 8 bits at linear resolution, only a dynamic range on the order of 20 is provided.
  • the light beam in egg ⁇ NEN primary beam and a secondary beam is split. Assuming by way of example that the light beam strikes the disk at an angle of 60 ° and the glass of the recorders has a refractive index of the order of 1.5, the primary beam is approximately 70 times brighter than the secondary beam. If the primary beam and the secondary beam fall on a light sensor with 8-bit linear resolution, the light sensor is not able to detect both beams reliably.
  • the dynamic range corresponds to at least 12 bits in the case of linear resolution.
  • it may help to choose a light sensor with non-linear resolution.
  • the non-linear resolution is selected such that the brightness difference of two adjacent brightness levels increases with increasing brightness.
  • the light sensor has a logarithmic resolution. The fact that a light sensor with logarithmic resolution is generally less suitable for distinguishing brightness levels close to one another is not a relevant disadvantage in the context of the invention because only two light beams are to be detected whose brightness differs considerably. With logarithmic resolution, a dynamic range of 8 bits can be achieved, which is easily sufficient to detect the primary beam and the secondary beam in parallel.
  • the light sensor preferably has a sensor surface covered with a plurality of pixels.
  • the resolution according to the invention is preferably provided for the individual pixels.
  • the light beam has a linear polarization
  • said polarization- ⁇ onsraum encloses an angle between 50 ° and 130 ° case level with the inputs.
  • the plane of incidence is defined by the axis of the incident light on the disk and the disk normal ⁇ beam at the location at which the light beam impinges on the disk.
  • a light beam may be described as a superposition of a plurality of electromagnetic waves, each individual wave having a linear polarization direction oriented perpendicular to the propagation direction of the light.
  • the light beam formed by superposition of the individual waves has a linear polarization if the individual waves of the respective polarization direction are represented in the light beam with higher intensity than other polarization directions.
  • the light beam were composed exclusively of individual waves of the respective linear polarization direction. In practice, this is usually can not be verwirkli ⁇ chen, but you will be content with the fact that the polarization direction in question is represented in significantly higher intensity than other polarization directions.
  • the linear polarization of the light beam can be specifically aligned relative to the plane of incidence of the light beam.
  • the plane of incidence is spanned by the axis of the light beam and the ticket ⁇ normal to the place where the light beam to the
  • the disk normals designates the
  • Axis which is perpendicular to an imaginary Tangential ⁇ plane, which is placed at the place where the light beam impinges on the disk.
  • the light source should be ordered to ⁇ so that the light beam does not coincide with the disc normal.
  • the disc is transparent, so that the light beam can pass.
  • the disk is preferably made of a material whose Brechungsin ⁇ dex is greater than the refractive index of air. The disc is not part of the device according to the invention.
  • the targeted orientation of the polarization direction increases the brightness of the secondary beam and makes it easier to measure the primary beam and the secondary beam.
  • the difference in brightness between the primary beam and the secondary beam is due to the fact that the primary beam passes directly through the disk, while the secondary beam experiences two additional reflections inside the disk. How large the proportion of the reflected light in comparison ⁇ ratio is the percentage of transmitted light, depends inter alia on the polarization direction of the light.
  • the polarization direction of the light is chosen such that an increased proportion of the light is reflected in the interior of the pane, thus contributing to the brightness of the secondary beam.
  • the highest brightness of the secondary beam is obtained when the polarization Rich ⁇ processing of the light beam forms with the plane of incidence at an angle of 90 °.
  • the brightness of the secondary beam is then higher by about a factor of 2 than in the case of a non-polarized light beam.
  • a relevant increase in brightness occurs in the angle range between 50 ° and 130 °.
  • the angle is preferably between 70 ° and 110 °, more preferably between 80 ° and 100 °.
  • the primary beam and the secondary beam are spatially separated, so that they can be evaluated separately with the light sensor.
  • the primary beam and the secondary beam subtend an angle between them, with the result that that the distance between both beams increases with the distance to the disk.
  • a light sensor is dimensioned and arranged so that both the primary beam and the secondary beam impinge on the light sensor. The two beams can then be measured simultaneously.
  • the light sensor may have an evaluation unit which automatically determines the position of the primary beam and the secondary beam on the light sensor.
  • Such an evaluation unit makes it possible to automate the measurement of the disk as a whole. Certain properties of the disk can be calculated automatically, for example, if the disk is in line with certain norms . On a display of the evaluation unit, a corresponding information can be output.
  • a concentrated light beam the extent of which is small transverse to the propagation direction.
  • the measurement result is independent of the distance between the light source and the lens.
  • a collimated beam of light can be obtained by placing a suitable collimating lens between the light source and the disk.
  • ⁇ a laser is used as the light source to write a collimated light beam by itself.
  • the linear polarization the light beam obtained by the fact that the light beam between the light source and the disc passes through a suitable polarizing filter.
  • the polarizing filter is transparent to light of the respective polarization direction, while other polarization directions are attenuated or preferably completely suppressed.
  • the light source may be used is play, in ⁇ into consideration the use of a He-Ne laser with geeigne ⁇ th linear polarization.
  • the orientation of the plane of incidence may depend on where the beam of light hits the disc. In order to adapt the direction of polarization at different incidence ⁇ planar, it is advantageous when the polarization filter and the light source are designed so that the linear polarization direction is adjustable.
  • the element in question is rotatably mounted about the axis of the light beam.
  • the distance between the two beams depends on the distance from the disk. In general, therefore, an exact adjustment of the distance between the disc and the
  • a converging lens is arranged between the disk and the light sensor through which the primary beam and the secondary beam pass.
  • the position of primary beam and Secondary beam on the light sensor independent of the distance between the lens and the lens.
  • the device may be designed in such a way that the light sensor and the converging lens are components of an analyzer in which the light sensor and the condenser lens are held at a fixed distance from one another. The measurement of the disk is facilitated in this way, because the light sensor has the appropriate distance to the converging lens and the distance between the converging lens and the disc does not affect the measurement. The adjustment concerned is therefore eliminated.
  • the converging lens is a lens system of a plurality of individual lenses and the
  • Light sensor is arranged in the focal plane of the lens system.
  • the diameter of the converging lens is preferably RESIZE ⁇ SSER than 30 mm and may for example be between 40 mm and 60 mm. With this size, the condenser lens is apt to capture both the primary beam and the secondary beam.
  • the invention also relates to a method for measuring discs.
  • a light beam is passed through a disk onto a light sensor.
  • a light sensor is used, which has a Dy ⁇ namikoir of more than 8 bits in linear resolution.
  • the method can be developed with further features that are described in the context of the device according to the invention. The invention will now be described by way of example with reference to the accompanying drawings by way of advantageous embodiment. Show it:
  • FIG. 1 shows a schematic representation of a erfindungsge ⁇ MAESSEN device.
  • FIG. 2 shows an enlarged detail of FIG. 1 in the case of a wedge-angle disk
  • FIG. 3 shows an enlarged detail of FIG. 1 with a curved disk
  • FIG. 5 shows a block diagram of an evaluation unit according to the invention.
  • a device according to the invention in FIG. 1 comprises a light source 14 in the form of a He-Ne laser.
  • the light source 14 transmits a collimated light beam 15 in the direction to be measured of a windshield 16 of a motor driving ⁇ zeugs.
  • the light beam 15 strikes the disc 16 at an acute angle. As it passes through the disc 16, the light beam is split into a primary beam 17 and a secondary beam 18 which, when exiting from the disc
  • the primary beam 17 and the secondary beam 18 are collected by an analyzer 19.
  • the analyzer 19 um ⁇ summarizes a tubular housing, at the front end of a converging lens 20 is arranged.
  • the converging lens 20 bil ⁇ det enter an objective of the analysis device 19 through which the Pri ⁇ märstrahl 17 and secondary beam 18 into the housing.
  • At the other end of the housing is a light sensor 21 arranged on which the primary beam 17 and the secondary beam 18 meet.
  • the light sensor 21 may be, for example, a CCD camera.
  • the distance Zvi ⁇ rule of the converging lens 20 and the light sensor 21 corresponds to the focal length of the converging lens 20, the light sensor 21 is therefore in the focal plane of the converging lens 20 are disposed.
  • the condenser lens 20 may, for example, have a diameter of 50 mm and a focal length of 300 mm.
  • the primary beam 17 and the secondary beam 18 impinge on the light sensor 21 at a distance d from each other. Since the light sensor 21 is arranged in the focal plane of the converging lens 21, the distance d is not dependent on the Ab ⁇ stand between the converging lens 20 and the disc 16. It is therefore not necessary, the analyzer 19 in a precisely defined distance to the disc 16 to bring. From the distance d, the double image angle ⁇ can be determined according to the following formula:
  • f is the focal length of the condenser lens 20.
  • ⁇ double angle ⁇ is approximately as the quotient of d and f.
  • Own conclusions regarding ⁇ properties of the disc 16 can be drawn from the double angle ⁇ , for example geomet ⁇ innovative features in the region in which the light beam is passed 15 through the disc 16 passes.
  • the splitting of the light beam 15 into the primary beam 17 and the secondary beam 18 results according to FIG. 2, for example, during the passage of the light beam 15 through a Disc 16, which has a wedge angle, so that the two outer surfaces are not parallel to each other.
  • FIG. 2 For a corresponding splitting into the primary beam 17 and the secondary beam 18, as shown in FIG.
  • the passage of the light beam 15 occurs through a curved disk 16. From the double image angle ⁇ , it is possible, for example, to draw conclusions about the wedge angle or the radius of curvature of the disk 16. In addition, it can be determined by comparison with corresponding limit values whether the double-angle ⁇ itself corresponds to the specifications.
  • the light beam 15 coming from the light source 14 spans the incidence plane with the slice normal 22.
  • the disk normal 22 is perpendicular to the disk 16 at the location where the light beam 15 strikes the disk 16.
  • the disks ⁇ normal 22 perpendicular to the tangential plane 23 which is applied to the relevant location on the disk 16, see FIG. 3.
  • the light beam 15 generated by the light source 14 is collimated and has a linear polarization.
  • the light sensor 21 is a matrix sensor having a matrix of photosensitive photodiodes. In each photodiode is with the impact of a light beam, a number of charge carriers ⁇ sets, which is proportional to the brightness. Based on the number of charge carriers, a brightness level is determined and an association is made between the photodiode and the brightness level. In the classical linear assignment, the number of charge carriers increases from brightness level to brightness level linearly, with the result that the dynamic range of the light sensor 21 is limited. For the device according to the invention an enlarged dynamic range is desired, which is why the light sensor 21 has a logarithmic resolution.
  • the number of free charge carriers thus increases exponentially from brightness level to Hellig ⁇ keits syndrome.
  • the light sensor 21 has an increased dynamic range and it becomes possible to determine with the light sensor 21 both the primary beam 17 and the secondary beam 18 with sufficient accuracy, even if the primary beam 17 is brighter, for example, by a factor of 30 than the secondary beam 18.
  • the digital values are passed from the light sensor 21 to an evaluation unit 25 and stored there in a memory 26.
  • a calculation module 27 determines from the values stored in the memory 26 the distance d at which the primary beam 17 and the secondary beam 18 impinge on the light sensor 21.
  • the double image angle ⁇ can be determined in a further calculation step, which the primary beam 17 and the secondary beam 18 enclose with one another on exiting the disk 16.
  • a second memory 28 is a setpoint for the double-angle ⁇ behind ⁇ sets.
  • the computing module 27 compares the determined value with the value from the memory 28 and indicates on a display 29 information from whether the disc 16 meets the requirements ge ⁇ .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un dispositif pour mesurer des vitres (16), qui comprend une source lumineuse (14) et un capteur de lumière (21), agencés de manière qu'un faisceau lumineux (15) provenant de la source lumineuse (14) traverse la vitre (16) et parvienne sur le capteur de lumière (21). Selon l'invention, ledit capteur de lumière (21) présente une portée dynamique de plus de 8 bits en résolution linéaire. L'invention concerne en outre un procédé correspondant. L'invention permet de mesurer de manière fiable aussi bien un faisceau primaire qu'un faisceau secondaire du faisceau lumineux qui a traversé la vitre (16).
EP14772384.5A 2013-10-07 2014-09-25 Dispositif et procédé pour mesurer des vitres, en particulier des pare-brises de véhicules Ceased EP3055682A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202013008909.1U DE202013008909U1 (de) 2013-10-07 2013-10-07 Vorrichtung zum Vermessen von Scheiben, insbesondere von Windschutzscheiben von Fahrzeugen
PCT/EP2014/070536 WO2015052011A1 (fr) 2013-10-07 2014-09-25 Dispositif et procédé pour mesurer des vitres, en particulier des pare-brises de véhicules

Publications (1)

Publication Number Publication Date
EP3055682A1 true EP3055682A1 (fr) 2016-08-17

Family

ID=51619198

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14772384.5A Ceased EP3055682A1 (fr) 2013-10-07 2014-09-25 Dispositif et procédé pour mesurer des vitres, en particulier des pare-brises de véhicules

Country Status (4)

Country Link
US (1) US20160245760A1 (fr)
EP (1) EP3055682A1 (fr)
DE (1) DE202013008909U1 (fr)
WO (1) WO2015052011A1 (fr)

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DE102016218663B4 (de) 2016-09-28 2018-06-14 Audi Ag Verfahren zum flächigen Vermessen des Keilwinkels einer lichttransparenten Scheibe
EP3797957A1 (fr) * 2019-09-25 2021-03-31 Kuraray Europe GmbH Appareil permettant de mesurer un parametre optique d'un vitrage stratifie
EP4170327A1 (fr) * 2021-10-22 2023-04-26 Saint-Gobain Glass France Procédé et système de détection des défauts optiques dans un pare-brise en verre

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Also Published As

Publication number Publication date
DE202013008909U1 (de) 2015-01-09
US20160245760A1 (en) 2016-08-25
WO2015052011A1 (fr) 2015-04-16

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