WO2001031319A9 - Sensor zur detektion von feuchtigkeitstropfen und/oder schmutzpartikeln auf einer scheibe und verfahren zum betreiben eines solchen sensors - Google Patents
Sensor zur detektion von feuchtigkeitstropfen und/oder schmutzpartikeln auf einer scheibe und verfahren zum betreiben eines solchen sensorsInfo
- Publication number
- WO2001031319A9 WO2001031319A9 PCT/EP2000/008231 EP0008231W WO0131319A9 WO 2001031319 A9 WO2001031319 A9 WO 2001031319A9 EP 0008231 W EP0008231 W EP 0008231W WO 0131319 A9 WO0131319 A9 WO 0131319A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- detector
- emitter
- beams
- optical
- Prior art date
Links
Classifications
-
- 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
-
- 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
- B60S1/0874—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
-
- 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
- G01N21/94—Investigating contamination, e.g. dust
Definitions
- the present invention relates to a sensor for detecting drops of moisture and / or dirt particles on a window, in particular on a rear window of a motor vehicle.
- the sensor has at least one emitter for emitting optical rays onto the pane and at least one detector for receiving at least some of the rays reflected by moisture drops and / or dirt particles.
- the detector generates a received signal that is dependent on the beams received.
- the sensor also has evaluation means for evaluating the received signal.
- Such a sensor works according to an optical measuring principle.
- the sensor is preferably arranged on the inside of the rear window in the wiping area of a wiper. It can rain, snow, dust and. a. Detect on the rear window.
- the light emitted by the or each emitter is guided from the inside through the pane to the outside.
- the or each detector observes the light exit surface on the pane. If dirt particles or drops of moisture are deposited on the outside of the pane, these scatter the emitted light and at least partially reflect it onto the or each detector.
- the or each detector generates a received signal that depends on the illuminance of the received light.
- the or each emitter is designed, for example, as a luminescence diode (LED) and the or each detector is designed as a photodiode, which generates a photocurrent as a received signal depending on the optical beams received.
- the type of precipitation on the disk can be inferred.
- the analysis of the received signal is based u. a. based on experience. For example, a continuous slow decrease in the amplitude of the received signal from an amplitude maximum over a longer period (several minutes) indicates dirt on the rear window. Likewise, a continuous, slow increase in the amplitude value of the received signal indicates moisture on the disk.
- suitable actions can then be triggered to remove the precipitation.
- a windscreen wiper can be activated to remove moisture drops, and the windscreen washer system can also be activated to remove dirt particles.
- the received signal is preferably evaluated using a microprocessor. This presupposes that the received signal is in digital form.
- a microprocessor For this purpose, it is known from the prior art to use an A / D converter. Inexpensive A / D converters, however, have a relatively low resolution and dynamic range, which is too low for use in sensors of the type mentioned at the beginning. A / D converter with a higher resolution and dynamic range, which is used in the sensors of the aforementioned Kind would be sufficient, but are quite expensive and would lead to a considerable increase in the cost of sensors for the detection of moisture drops and / or dirt particles.
- Drops of moisture and / or dirt particles reflected light is received by the or each detector and leads to a relatively large offset of the received signal.
- the changes in the received signal due to precipitation on the disk are very small in relation to the offset of the received signal. This applies in particular to drops of moisture, since they lead to an even smaller change in the received signal than dirt particles. For this reason, the received signal in the sensor has to be digitized with high dynamics and resolution.
- the invention based on the sensor for the detection of moisture drops and / or dirt particles of the type mentioned at the outset, proposes that the or each emitter successively optical beams with different light intensities emits, the evaluation means assigning the light strengths of the emitted optical beams to the received signal and taking them into account when evaluating the received signal.
- the or each emitter is operated with different powers.
- a higher light intensity of the emitted optical rays leads to a higher luminous flux and thus to a higher illuminance of the received rays, which are then evaluated by the detector (cf.Kuchling, Horst, Taschenbuch der Physik, 11th edition, publisher Harri Deutsch, 1988 , Pp. 385 to 394).
- the detector cf.Kuchling, Horst, Taschenbuch der Physik, 11th edition, publisher Harri Deutsch, 1988 , Pp. 385 to 394.
- the resolution and dynamics required for digitizing the received signal are also significantly reduced, since the useful components in the received signal, i. H. the changes in the received signal due to drops of moisture and / or dirt particles on the pane are significantly stronger in relation to the offset of the received signal.
- the or each emitter alternate optical beams with a high and a emits low light intensity. This enables a sufficiently reliable detection and differentiation of moisture drops and / or dirt particles on the pane to be achieved and the additional circuitry for the sensor according to the invention is limited.
- optical beams with a high light intensity and the optical beams with a low light intensity do not have to be emitted in each case for the same length. Rather, the length of time for which optical rays are emitted with a high or with a low light intensity can take into account the fact that drops of moisture are deposited on a pane relatively quickly and can only be detected for a relatively short period of time, whereas dirt particles usually slowly on the disc over a longer period of time. It is therefore proposed according to a preferred embodiment of the present invention that the or each emitter emits optical rays with a high light intensity for at least 90% of the total transmission time. Optical rays with a low light intensity are then emitted during the remaining 10% of the transmission time. Practical tests have shown that particularly good detection and
- optical beams with a high light intensity are emitted for approximately 950 ms (95% of the transmission time) and then optical beams with a low light intensity for 50 ms.
- the senor have two emitters, one emitter being arranged in such a way that a part of the rays reflected by drops of moisture and / or dirt particles predominantly forward scattering strikes the or each detector, and the other emitter is arranged such that a part of the rays reflected by moisture drops and / or dirt particles predominantly strikes the or each detector backward scattering. Rapidly occurring and disappearing changes in the received signal (e.g. due to moisture drops on the window) can be observed and evaluated particularly well with the forward scatter. Slow changes in the received signal (e.g. due to dirt particles on the window), on the other hand, can be observed and evaluated particularly well with a combination of the backward and forward scatter.
- the sensor advantageously has a detector. If the sensor has more than one emitter, this detector receives the optical rays emitted by all emitters and reflected by the moisture drops and / or the dirt particles. For this it is necessary that the rays emitted by the individual emitters are identifiable. It is conceivable that the individual emitters emit optical beams at different times from one another. Alternatively or additionally, the properties of the optical beams emitted by the individual emitters can also be modulated differently.
- the emitters are arranged rotated by a normal of the disk by 180 ° relative to one another and the detector is arranged rotated by the normal of the disk by ⁇ 45 ° relative to the predominantly backward-scattering receiving emitter, wherein the emitters and the detector to the same measuring range are aligned.
- the emitters and the detector must be arranged in such a way that optical rays emitted by the emitters are not properly reflected on the detector, neither from the outside nor from the inside of the pane, ie not from moisture drops and / or dirt particles.
- no properly reflected rays should fall on surfaces that lie within the measuring range of the sensor and be observed by the detector.
- the detector is advantageously rotated by 40 ° relative to the normal of the disk relative to the emitter, which predominantly receives backward scattering. This makes it possible to achieve particularly good detection and differentiation properties of the sensor.
- the emitters and the detector are arranged inclined at an angle of> 45 ° relative to the normal to the pane.
- the emitters and the detector are advantageously arranged at an angle of 70 ° relative to the normal to the disk.
- the emitters emit optical beams of different wavelengths
- the evaluation means assigning the wavelengths of the emitted optical beams to the received signal and taking them into account when evaluating the received signal.
- the optical rays with different wavelengths differ in their different color from each other.
- the or each emitter be assigned first optical components for influencing the beam path of the emitted optical beams and the or each detector is assigned second optical components for influencing the beam path of the reflected beams.
- This embodiment of the sensor according to the invention allows the emitters and detectors to be freely arranged in the sensor. With the aid of the optical components, the optical beams can be directed from the emitters to suitable locations for coupling out the beams, or the reflected optical beams can be directed from suitable locations for coupling in the beams to the detectors.
- the first optical components advantageously parallelize the emitted optical beams.
- the diverging beams emitted by the emitters are directed in parallel when they enter the first optical component.
- the second optical components advantageously bundle the received beams onto the or each detector.
- the optical beams received by the second optical component are bundled on exiting the second optical component onto the detector, in particular onto its light-sensitive surface.
- the optical components are preferably light guides educated.
- the coupling-in surface of the first light guide and the coupling-out surface of the second light guide are preferably aspherical.
- the senor rests with a bearing surface on the inside of the pane, the bearing surface having a protruding edge made of an elastically flexible material and the sensor being pressed against the pane.
- the sensor is advantageously pressed against the pane by means of a spring element.
- the sensor is integrated, for example, in a rear window wiper motor module or in a third brake light.
- the spring element can be supported on the motor module or the housing of the third brake light and thus press the sensor against the inside of the disc.
- the sensor advantageously has an angled opening which connects the measurement space delimited by the contact surface of the sensor, by the inside of the pane and by the elastic edge with the surroundings of the sensor.
- the measuring room can be ventilated via this opening without moisture or dust penetrating.
- the or each emitter is designed as a luminescent diode (LED).
- the or each detector is designed as a photodiode.
- the received signal is designed as a photocurrent.
- Figure 2 shows the sensor of Figure 1 in a view from below.
- a sensor for the detection of drops of moisture and / or dirt particles on a pane is designated in its entirety by reference number 1.
- the window is designed as a rear window 2 of a motor vehicle.
- the sensor 1 rests with a contact surface on the inside of the window 2 in the wiping area of a window wiper (not shown).
- the bearing surface has a projecting edge 6 made of an elastically flexible material.
- the sensor 1 is pressed against the pane with the aid of a spring element (not shown).
- the sensor 1 is integrated, for example, in a third brake light or in a rear window wiper motor module.
- the spring element can be supported on the housing of the brake light or on the motor module.
- the sensor 1 has two emitters 3a, 3b for emitting optical rays 4 onto the rear window 2.
- the emitters 3a, 3b are designed as luminescent diodes (LEDs).
- the optical beams 4 are coupled into a first optical component 15.
- a coupling surface 16 of the first component 15 is aspherical.
- the diverging beams 4 are directed parallel when they enter the first optical component 15.
- the rays 4 emerging from the first optical component 15 first pass through an air gap 5, hit the inside of the rear window 2 and pass through it. If there are no drops of moisture and / or dirt particles on the window 2, the rays 4 emerge from the outside of the rear window 2 again.
- the optical rays 4 emitted by the emitters 3a, 3b is reflected or scattered on the moisture drops 7 and / or the dirt particles 8 .
- the reflected rays 9 are first coupled into a second optical component 17 and then coupled out of this onto a detector 10 of the sensor 1.
- the detector 10 is designed as a photodiode.
- a decoupling surface 18 of the second component 17 is aspherical.
- the rays 9 are focused on a photosensitive surface of the detector 10 when they exit the second optical component 17.
- the optical components 15, 17 are preferably designed as light guides.
- the beams 4 emitted by the emitters 3a, 3b are coupled out of the first optical component 15 at an angle of 70 ° to the normal 19 of the pane 2.
- the rays 9 reflected by the moisture drops 7 and / or dirt particles 8 are at an angle of 70 ° to the normal 19 of the pane 2 is coupled into the second optical component 17.
- the two emitters 3a, 3b are arranged opposite one another (see FIG. 2). The one
- Emitter 3a is arranged in such a way that the rays 9 reflected by the moisture drops 7 and / or the dirt particles 8 predominantly strike the detector 10 in a forward-scattering manner.
- the other emitter 3b is arranged in such a way that the rays 9 reflected by the moisture drops 7 and / or the dirt particles 8 strike the detector 10 predominantly backwards.
- the detector 10 is arranged rotated by the normal 19 of the disk 2 by 40 ° to the emitter 3b, which mainly receives backward scattering.
- the detector 10 generates a received signal which is dependent on the quantity and the light intensity of the received beams 9.
- the received signal is designed as a photo stream.
- the time course and the amplitude of the received signal are evaluated in evaluation means (not shown) of the sensor 1.
- the sensor 1 can rain, snow, dust, insects and. a. Detect on the rear window 2 and differentiate from one another.
- a windshield wiper can be activated to remove moisture drops 7, and the windshield washer system can also be activated to remove dirt particles 8.
- the emitters 3a, 3b transmit successively in time with different powers, so that they emit optical beams 4 with different light intensities.
- the evaluation means assign the light intensity of the emitted optical beams 4 to the received signal.
- the changing light intensities of the optical beams 4 are taken into account.
- the emitters 3a, 3b alternately emit optical beams 4 with a high light intensity for a period of approximately 950 ms and then emit optical beams 4 with a low light intensity for a period of approximately 50 ms. This takes into account the fact that drops of moisture 7 deposit relatively quickly on a pane 2, whereas dirt particles 8 generally settle slowly on the pane 2 over a longer period of time.
- optical rays 4 with a high light intensity small but rapid changes in the received signal due to drops of moisture 7 on the pane 2 can be detected particularly well.
- optical beams 4 with a low light intensity on the other hand, slow changes in the received signal due to dirt particles 8 on the pane 2 can be detected particularly well.
- the emitters 3a, 3b emit optical rays 4 of different wavelengths.
- the evaluation means allocate the wavelengths of the emitted optical beams 4 to the received signal of the detector 10 and take the wavelengths into account when evaluating the received signal. Due to the different wavelengths of the rays 4, the received rays 9 can be in the frame the evaluation of the received signal to the individual emitters 3a; 3b are assigned.
- the resolution and dynamics necessary for digitizing the received signal are decisively reduced, since the useful components in the received signal, i.e. the changes in the received signal due to precipitation 7, 8 on the pane 2 are significantly amplified in relation to the offset of the received signal.
- This enables the use of conventional A / D converters with a relatively low resolution and dynamic range for digitizing the received signal in the evaluation means of sensor 1 without sacrificing the detection and differentiation properties of sensor 1.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001533408A JP2005518519A (ja) | 1999-10-28 | 2000-08-23 | ガラス面の水滴及び砂塵を検出するセンサ |
EP00954646A EP1224452A1 (de) | 1999-10-28 | 2000-08-23 | Sensor zur detektion von feuchtigkeitstropfen und/oder schmutzpartikeln auf einer scheibe und verfahren zum betreiben eines solchen sensors |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999151831 DE19951831A1 (de) | 1999-10-28 | 1999-10-28 | Sensor zur Detektion von Feuchtigkeitstropfen und/oder Schmutzpartikeln auf einer Scheibe und Verfahren zum Betreiben eines solchen Sensors |
DE19951831.9 | 1999-10-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001031319A1 WO2001031319A1 (de) | 2001-05-03 |
WO2001031319A9 true WO2001031319A9 (de) | 2004-04-29 |
Family
ID=7927105
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/008231 WO2001031319A1 (de) | 1999-10-28 | 2000-08-23 | Sensor zur detektion von feuchtigkeitstropfen und/oder schmutzpartikeln auf einer scheibe und verfahren zum betreiben eines solchen sensors |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1224452A1 (de) |
JP (1) | JP2005518519A (de) |
DE (1) | DE19951831A1 (de) |
WO (1) | WO2001031319A1 (de) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10126953A1 (de) * | 2001-06-01 | 2002-12-05 | Bosch Gmbh Robert | Verfahren zum Betreiben eines Regensensors sowie Regensensor zur Durchführung des Verfahrens |
DE102005042962A1 (de) * | 2005-09-09 | 2007-03-22 | Hella Kgaa Hueck & Co. | Sensor zum Erfassen von Schmutz auf transparenten Oberflächen oder Ermittlung von Entfernungen zu festen Körpern |
DE202006000742U1 (de) * | 2006-01-18 | 2007-05-24 | Trw Automotive Electronics & Components Gmbh & Co. Kg | Optische Sensorvorrichtung |
DE102006023180B4 (de) * | 2006-05-17 | 2014-08-07 | Continental Automotive Gmbh | Verfahren und Anordnung zur Ermittlung des Verschmutzungsgrades zumindest eines Glasscheibenabschnitts eines Fahrzeugleuchtenmodul |
DE102006039034A1 (de) * | 2006-08-19 | 2008-02-21 | Carl Zeiss Ag | Anordnung zur Detektion von Regen, Schmutz und Umgebungslicht |
DE102006044792A1 (de) * | 2006-09-13 | 2008-03-27 | Schefenacker Vision Systems Germany Gmbh | Sensor zur Detektion von Schmutz und/oder Regen und Verfahren zum Betreiben eines Sensors |
DE102007013688B3 (de) * | 2007-03-22 | 2008-11-06 | Odelo Gmbh | Optoelektronische Sensoreinrichtung und Verfahren zur Bestimmung der Transparenz einer Verschmutzungen ausgesetzten Oberfläche |
JP4692651B2 (ja) * | 2009-02-17 | 2011-06-01 | 株式会社デンソー | 雨滴検出装置並びにそれを備えたワイパ自動制御装置 |
JP5756818B2 (ja) * | 2013-01-10 | 2015-07-29 | 富士重工業株式会社 | 車外設置用撮像装置 |
DE102014105312B3 (de) * | 2014-04-14 | 2015-08-06 | Sick Ag | Erfassungsvorrichtung |
JP6714462B2 (ja) * | 2016-07-29 | 2020-06-24 | 株式会社日立製作所 | 無線センサ端末、無線センサシステムおよびセンサデータ収集方法 |
US10144356B2 (en) | 2017-03-24 | 2018-12-04 | Ford Global Technologies, Llc | Condensation detection for vehicle surfaces via light transmitters and receivers |
US20180272936A1 (en) * | 2017-03-24 | 2018-09-27 | Ford Global Technologies, Llc | Detection and presentation of obstructed vehicle views |
CN107244294A (zh) * | 2017-06-27 | 2017-10-13 | 山东国金汽车制造有限公司 | 一种可自动清洗的后视镜 |
DE102018100805A1 (de) * | 2018-01-16 | 2019-07-18 | Connaught Electronics Ltd. | Reinigungsvorrichtung zum Reinigen eines lichtdurchlässigen Frontelements eines optischen Sensors für ein Kraftfahrzeug, Anordnung sowie Verfahren |
US10948576B2 (en) | 2018-02-15 | 2021-03-16 | Ford Global Technologies, Llc | Surface dirtiness detection |
DE102018121454A1 (de) * | 2018-09-03 | 2020-03-05 | Motherson Innovations Company Limited | Anzeigevorrichtung mit Beschlagserkennungseinrichtung und Verfahren zum Betreiben einer Beschlagserkennung, ein Außenspiegel sowie ein Kraftfahrzeug |
CN111016790B (zh) * | 2019-12-11 | 2021-05-25 | 北京汽车股份有限公司 | 控制智能内后视镜的方法、装置、存储介质以及车辆 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0208610B1 (de) * | 1985-07-04 | 1990-11-22 | Jaeger | Vorrichtung zum Erfassen von fremden Substanzen durch eine Trennwand und Fahrhilfssystem für Fahrzeuge oder Luftfahrzeuge |
US4867561A (en) * | 1986-08-22 | 1989-09-19 | Nippondenso Co., Ltd. | Apparatus for optically detecting an extraneous matter on a translucent shield |
US4798956A (en) * | 1987-07-15 | 1989-01-17 | Hochstein Peter A | Electro-optical windshield moisture sensing |
DE4112847A1 (de) * | 1991-04-19 | 1992-10-22 | Bosch Gmbh Robert | Vorrichtung zum betreiben eines regendetektors |
DE4312590A1 (de) * | 1992-04-17 | 1993-10-28 | Peter Prof Dr Gottwald | Optoelektronische Einrichtung für Klarsichtscheiben zum Erkennen der Benetzung und Verschmutzungen und zur automatischen Betätigung von Warn- und/oder Reinigungsanlagen |
DE4318358C2 (de) * | 1993-05-28 | 1996-09-05 | Visolux Elektronik Gmbh | Verfahren und Vorrichtung zum Messen von Streulicht erzeugenden Oberflächenfehlern von optischen Medien, wie Glas oder Kunststoff, insbesondere von Fahrzeugscheiben |
US5386111A (en) * | 1993-10-08 | 1995-01-31 | Zimmerman; H. Allen | Optical detection of water droplets using light refraction with a mask to prevent detection of unrefracted light |
DE4340681C2 (de) * | 1993-11-30 | 1997-09-04 | Telefunken Microelectron | Sensorsystem zur Erfassung der optischen Verhältnisse an einer Grenzfläche |
DE19643465C2 (de) * | 1996-10-22 | 1999-08-05 | Bosch Gmbh Robert | Steuervorrichtung für einen optischen Sensor, insbesondere einen Regensensor |
-
1999
- 1999-10-28 DE DE1999151831 patent/DE19951831A1/de not_active Withdrawn
-
2000
- 2000-08-23 EP EP00954646A patent/EP1224452A1/de not_active Withdrawn
- 2000-08-23 WO PCT/EP2000/008231 patent/WO2001031319A1/de not_active Application Discontinuation
- 2000-08-23 JP JP2001533408A patent/JP2005518519A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
EP1224452A1 (de) | 2002-07-24 |
DE19951831A1 (de) | 2001-05-03 |
JP2005518519A (ja) | 2005-06-23 |
WO2001031319A1 (de) | 2001-05-03 |
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