EP2176098A1 - Dispositif pour déterminer les propriétés réflectives d'une surface limite - Google Patents

Dispositif pour déterminer les propriétés réflectives d'une surface limite

Info

Publication number
EP2176098A1
EP2176098A1 EP08774765A EP08774765A EP2176098A1 EP 2176098 A1 EP2176098 A1 EP 2176098A1 EP 08774765 A EP08774765 A EP 08774765A EP 08774765 A EP08774765 A EP 08774765A EP 2176098 A1 EP2176098 A1 EP 2176098A1
Authority
EP
European Patent Office
Prior art keywords
medium
coupling
radiation
optics
optical arrangement
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Withdrawn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
EP08774765A
Other languages
German (de)
English (en)
Inventor
Andreas Pack
Markus Wolff
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2176098A1 publication Critical patent/EP2176098A1/fr
Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
    • B60S1/0833—Optical rain sensor
    • B60S1/0837—Optical rain sensor with a particular arrangement of the optical elements
    • 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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G01N21/552—Attenuated total reflection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
    • B60S1/0874—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means characterized by the position of the sensor on the windshield
    • B60S1/0888—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means characterized by the position of the sensor on the windshield characterized by the attachment of the elements in a unit

Definitions

  • the invention relates to a device for determining the reflection properties of an interface, as for example in an optical system for an optical sensor such. B. can find a rain sensor use.
  • An electromagnetic radiation source 6 such as an infrared LED emits electromagnetic radiation 4 at a certain angle from the inside of a pane 1, ie usually from the passenger compartment of a motor vehicle, in the direction of the pane 1.
  • the radiation 4 passes through the interface between the interior and disc 1 and is deflected against the interface 10 formed by disc 1 and the vehicle exterior, which is referred to as the sensitive area in this area.
  • the angle of incidence of the electromagnetic radiation 4 with respect to the interface 10 is selected such that the electromagnetic radiation 4 in the case of a disk 1 not wetted by raindrops at the interface 10 according to the laws of optics in the direction of the inside of the disk 1 as reflected radiation 5 is totally reflected and is detected by a arranged near the disc inside, for example, designed as an infrared LRD receiver 7 is detected.
  • a arranged near the disc inside for example, designed as an infrared LRD receiver 7 is detected.
  • this total reflection is disturbed or canceled due to the changed refractive index ratios at the interface 10, so that a portion of the electromagnetic radiation 4 is coupled to the outside and arrives at the LRD 7 less radiation than in the case of total reflection.
  • Lenses used for beam guidance for an LED 6 and a LRD 7, wherein both lenses are designed ient.
  • the Fresnel lenses 13a described in said application,
  • German Patent Application DE 10 2004 015 699 A1 discloses a rain sensor. beard, which has an optical arrangement with reflective areas.
  • the device according to the invention for determining the reflection properties of an interface between a first and a second medium shows an electromagnetic radiation source and an optical arrangement which serves to couple the radiation emitted by the radiation source into the first medium.
  • the first medium may be a part of a vehicle window, in particular a front window; the second medium is air in this case, or water in the case of a rain wetted disk.
  • the already mentioned optical arrangement is likewise used, which directs the reflected radiation coupled out of the first medium onto a receiver.
  • the optical arrangement has areas where the radiation reflects, in particular totally reflected, as well as at least parts of a Fresnel lens.
  • This embodiment of the optical arrangement has the advantage that the radiation source and the receiver do not have to be arranged at a greater distance than that which corresponds to the lateral extent of the optical arrangement.
  • this measure allows a very compact design of the optical arrangement and thus also equipped with the optical arrangement according to the invention rain sensor.
  • An advantageous embodiment of the invention consists in the realization of the optical arrangement in the form of two partial optics, in particular a coupling-in optical system and a coupling-out optical system, each of which is designed as a Fresnel lens or as part of a Fresnel lens.
  • the nel lens can be designed in such a way that refraction and total reflection take place exclusively in first partial regions of the lens and in second partial regions of the lens.
  • the receiver and the radiation source are each assigned a partial optics, both of which need not be made identical, but rather can be chosen so that they are optimally matched to the directional characteristic of the radiation source or the receiver and in particular an arrangement of the radiation source and the Allow receiver within the lateral extent of the optics assembly.
  • the optical arrangement in particular the coupling optics, is chosen such that the radiation emanating from the radiation source runs as a parallel beam in the first medium and, after being totally reflected at the interface, the coupling-out optics also as a parallel beam is reached and focused by this on the receiver.
  • the ratio of sensitive area to the dimensions of the optical arrangement is particularly advantageous.
  • Figure 1 is an illustration of the principle of action of a rain sensor according to the prior
  • FIG. 3 shows a first embodiment of a rain sensor according to the invention
  • Figure 4 is a plan view of the optical arrangement of a rain sensor according to the invention
  • FIG. 5 and FIG. 6 show further variants of a rain sensor according to the invention.
  • FIG. 3 shows a device according to the invention in a cross-sectional representation.
  • the optical assembly 13 is connected to the disk 1 via the intermediate layer 2, which simultaneously serves to improve the coupling and decoupling of the electromagnetic radiation 4 or 5 used by index matching.
  • the radiation 4 emitted by the radiation source 6 designed as an LED, for example is coupled into the pane 1 via the partial optics 13a of the optical arrangement 13 and the intermediate layer 2 and is totally reflected on the opposite side.
  • the reflected partial beam 5 of the electromagnetic radiation subsequently passes through the intermediate layer 2 and is focused via the partial optics 13b of the optical arrangement onto the receiver 7 embodied as an LRD, for example.
  • the two partial optics 13a, 13b respectively show partial areas 15 in which only refraction and partial areas 14 in which refraction and total reflection occurs.
  • the partial optics 13a associated with the radiation source 6 is selected such that the electromagnetic radiation 4 emitted by the radiation source 6 is parallelized and impinges on the boundary surface 10 between the pane 1 and the exterior space at an angle at which total reflection occurs. If the pane 1 is unwetted on its side facing the outer space, the electromagnetic radiation is totally reflected as partial beam 5 and falls onto the receiver 7 after passing through the focusing partial optics 13b.
  • the partial optics 13a and 13b need not be geometrically identical; Rather, they can be individually adapted to the directional characteristic of the radiation source 6 and of the receiver 7.
  • the individually designed geometry opens up the possibility of compensating for a height difference 18 of the optically active regions of radiation source 6 and receiver 7.
  • the arranged in a partial optics 13a and 13b total reflection surfaces need not all run perpendicular to the disc 1 and may in particular have different heights.
  • the areas of the partial optics 13a or 13b which provide the targeted refraction of the electromagnetic radiation can all be configured differently from one another geometrically.
  • FIG. 4 shows a further advantageous embodiment of the coupling-in and coupling-out optical system 13a or 13b, viewed from the vehicle-internal side.
  • the coupling-in and coupling-out optics 13a and 13b respectively consist of at least one arcuate circular segment (20).
  • the individual, for example, arcuate segments (20) themselves may also be composed of a plurality of straight sections (20a-d). If one refers to the plane lying parallel to the disc not shown as xy-plane, so for example a subdivision .der segments (20) in the y-direction is possible or possible in the direction of the respective arc.
  • the shape of each further subdivided segments is no limit set.
  • the effect of the described design of the coupling-in or coupling-out optics 13a and 13b consists essentially in a homogenization of the light field and in an increase in the efficiency of the arrangement.
  • the coupling-in and coupling-out optics 13a, 13b are preferably made of plastic, but may also consist of other materials which are translucent and have a different refractive index than the environment.
  • the coupling-in and coupling-out optics 13 a, 13 b may be made in one piece or as separate parts. Furthermore, there is the possibility that the coupling-in and coupling-out optics 13a, 13b consist of different materials.
  • coupling-in and coupling-out optics 13a, 13b can be composed of several parts.
  • FIG. 5 shows an evaluation electronic unit 8 associated with the optical device 13, which is arranged in a housing 9 made of preferably opaque material (eg an opaque plastic).
  • the communication with subordinate actuators or control devices (not shown) as well as the power supply takes place by means of an electrical interface (also not shown in FIG. 5).
  • the LED 6 and the LRD 7 work preferably in the infrared wavelength range; In this way, irritation of the vehicle driver or other road users is effectively prevented by escaping electromagnetic radiation in the visible spectral range.
  • the optics carrier 19 is dispensed with; rather, the optics arrangement 13 itself forms the cover of the housing 9.
  • a layer of opaque material 16 is arranged directly on the optics assembly 13.
  • the layer 16 may for example consist of silicone or plastic and be connected for example by gluing, adhesion or mechanical fastening, in particular by clips with the optical assembly 13.
  • the device according to the invention is of course not limited to use in a rain sensor; Rather, the invention can be used wherever electromagnetic radiation must be efficiently coupled and disconnected under the stress of as little space as possible in a medium.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • 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)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un dispositif pour la détermination des propriétés réflectives d'une surface limite (10) entre un premier et un deuxième agent, présentant une source de rayonnement électromagnétique (6) ainsi qu'un système optique (13) qui sert au couplage du rayonnement (4) émis par la source de rayonnement (6) dans le premier agent. Pour cela, en cas d'utilisation du système proposé par l'invention dans un capteur de pluie pour véhicules, le premier agent est une partie d'un disque de véhicule (1), notamment d'un pare-brise ; pour le deuxième agent, il s'agit de l'air ou de l'eau, si le disque (1) est mouillé par la pluie. Pour le découplage du rayonnement (5) réfléchi sur la surface limite (10), le système optique (13) déjà mentionné est également utilisé sur la base du premier agent, qui guide le rayonnement (5) réfléchi découplé sur la base du premier agent sur un récepteur (7). Le système optique (13) présente le rayonnement (4,5) des zones (14) réfléchissantes ainsi que des éléments d'une lentille à échelons.
EP08774765A 2007-08-01 2008-07-04 Dispositif pour déterminer les propriétés réflectives d'une surface limite Withdrawn EP2176098A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007036062 2007-08-01
DE102007039349A DE102007039349A1 (de) 2007-08-01 2007-08-21 Vorrichtung zur Bestimmung der Reflexionseigenschaften einer Grenzfläche
PCT/EP2008/058658 WO2009015988A1 (fr) 2007-08-01 2008-07-04 Dispositif pour déterminer les propriétés réflectives d'une surface limite

Publications (1)

Publication Number Publication Date
EP2176098A1 true EP2176098A1 (fr) 2010-04-21

Family

ID=40176006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08774765A Withdrawn EP2176098A1 (fr) 2007-08-01 2008-07-04 Dispositif pour déterminer les propriétés réflectives d'une surface limite

Country Status (3)

Country Link
EP (1) EP2176098A1 (fr)
DE (1) DE102007039349A1 (fr)
WO (1) WO2009015988A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008061616B4 (de) * 2008-12-11 2021-06-10 Bcs Automotive Interface Solutions Gmbh Optische Sensorvorrichtung
DE102009053825A1 (de) 2009-11-18 2011-05-19 Trw Automotive Electronics & Components Gmbh Optische Sensorvorrichtung zur Detektion von Umgebungslicht
FI20135064L (fi) 2013-01-23 2014-07-24 Janesko Oy Menetelmä taitekertoimen mittaamiseksi ja refraktometri
DE102013009126A1 (de) 2013-05-30 2014-12-04 Hella Kgaa Hueck & Co. Sensorvorrichtung
DE102014103849B4 (de) 2014-03-20 2020-08-06 Bcs Automotive Interface Solutions Gmbh Linsenplatte
GB2536237B (en) * 2015-03-09 2018-08-15 Jaguar Land Rover Ltd Windshield monitoring system
FI128037B (fi) 2015-06-29 2019-08-15 Janesko Oy Sovitelma refraktometrin mittaikkunan yhteydessä ja refraktometri
DE102015117266B4 (de) * 2015-10-09 2017-07-13 Trw Automotive Electronics & Components Gmbh Linsenbauteil eines Regensensors sowie Baukastensystem, Verfahren und Werkzeug zur Herstellung
DE102018119412B4 (de) * 2018-08-09 2023-03-30 Bcs Automotive Interface Solutions Gmbh Optische Baugruppe sowie Verfahren zur Herstellung einer optischen Baugruppe

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DE19608648C1 (de) * 1996-03-06 1997-10-23 Bosch Gmbh Robert Vorrichtung zum Erfassen von Benetzungsereignissen auf einer Scheibe
DE19821335C2 (de) * 1997-04-04 2000-07-13 Kostal Leopold Gmbh & Co Kg Optoelektronische Sensoreinrichtung
DE19830120B4 (de) 1997-07-09 2006-07-06 Leopold Kostal Gmbh & Co. Kg Optoelektronische Sensoreinrichtung
US5898183A (en) 1997-10-16 1999-04-27 Libbey-Owens-Ford Co. Compact moisture sensor with efficient high obliquity optics
US6232603B1 (en) 1998-10-29 2001-05-15 Kelsey-Hayes Co. Rain sensor operation on solar reflective glass
DE10261244A1 (de) 2002-12-20 2004-07-01 Robert Bosch Gmbh Regensensor, insbesondere für ein Kraftfahrzeug
DE102004015699A1 (de) 2004-03-29 2005-10-20 Bosch Gmbh Robert Regensensor
US7847255B2 (en) * 2006-11-16 2010-12-07 Pilkington North America, Inc. Multi-mode rain sensor

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
WO2009015988A1 (fr) 2009-02-05
DE102007039349A1 (de) 2009-02-05

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