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GB1242621A - Improvements in or relating to the detection of dirt or condensation on windows - Google Patents

Improvements in or relating to the detection of dirt or condensation on windows

Info

Publication number
GB1242621A
GB1242621A GB1604969A GB1604969A GB1242621A GB 1242621 A GB1242621 A GB 1242621A GB 1604969 A GB1604969 A GB 1604969A GB 1604969 A GB1604969 A GB 1604969A GB 1242621 A GB1242621 A GB 1242621A
Authority
GB
United Kingdom
Prior art keywords
condensation
dirt
photo
detected
cell
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.)
Expired
Application number
GB1604969A
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.)
Eltro GmbH and Co
Original Assignee
Eltro GmbH and Co
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 Eltro GmbH and Co filed Critical Eltro GmbH and Co
Publication of GB1242621A publication Critical patent/GB1242621A/en
Expired 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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/43—Refractivity; Phase-affecting properties, e.g. optical path length by measuring critical angle

Landscapes

  • 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

1,242,621. Detecting dirt or condensation on windows. ELTRO G.m.b.H. & CO. GES. FUR STRAHLUNGSTECHNIK. March 27, 1969 [March 27, 1968], No.16049/69. Heading G1A. The presence of dirt or condensation on a window 1 is detected by the use of two triangular prisms 2, 3 which are cemented on the inside window surface, a light source 4 and a photo-cell 5. With a clean outer surface light entering the glass of the window is totally internally reflected back and forth along the pane until it can emerge only via prism 3 on the inner surface, and is detected by photo-cell 5. The presence of a drop 7 condensed water on the outer surface allows some light to escape and the photo-cell output is therefore slightly diminished. A decreased output caused by condensation or dirt can be detected and used after amplification, to initiate operation of an alarm lamp or other signalling device or control the starting of, for example, a windscreen wiper or washer.
GB1604969A 1968-03-27 1969-03-27 Improvements in or relating to the detection of dirt or condensation on windows Expired GB1242621A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681755074 DE1755074B1 (en) 1968-03-27 1968-03-27 Display device for soiling and fogging of windows

Publications (1)

Publication Number Publication Date
GB1242621A true GB1242621A (en) 1971-08-11

Family

ID=5693303

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1604969A Expired GB1242621A (en) 1968-03-27 1969-03-27 Improvements in or relating to the detection of dirt or condensation on windows

Country Status (4)

Country Link
DE (1) DE1755074B1 (en)
FR (1) FR2004803A1 (en)
GB (1) GB1242621A (en)
SE (1) SE353497B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2424156A1 (en) * 1978-04-25 1979-11-23 Bayerische Motoren Werke Ag VEHICLE HEADLIGHT EQUIPPED WITH A CLOGGING DETECTOR
US4652745A (en) * 1985-12-06 1987-03-24 Ford Motor Company Optical moisture sensor for a window or windshield
GB2186077A (en) * 1986-02-04 1987-08-05 Vaisala Oy Light transmission measurement equipment compensated for protective glass surfaces contamination
US4701613A (en) * 1984-11-09 1987-10-20 Nippondenso Co., Ltd. Electro-optical rain detector for windshields
GB2208433A (en) * 1987-07-31 1989-03-30 Veglia Borletti Srl Detecting water droplets on a vehicle window and controlling windscreen wiper in response thereto
GB2360583A (en) * 2000-03-21 2001-09-26 Microflow Ltd Optical condensation monitor
WO2016058105A1 (en) * 2014-10-17 2016-04-21 Nima Nabavi Self-cleaning optical sensor assembly

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2833635C2 (en) * 1978-08-01 1983-05-05 Siemens AG, 1000 Berlin und 8000 München Method for measuring the contamination of optical interfaces in optical receivers and device for carrying out the method
DE3232059A1 (en) * 1981-09-04 1983-03-24 Westinghouse Electric Corp., 15222 Pittsburgh, Pa. GLASS FIBER DETECTOR
DE3247659A1 (en) * 1982-12-23 1984-06-28 Wolfgang Dr. 7000 Stuttgart Ruhrmann OPTICAL SENSOR
DE3619538A1 (en) * 1986-06-10 1987-12-17 Egon Harig Apparatebau Elektro DEVICE DETECTING ARRANGEMENT
DE102014220652A1 (en) * 2014-10-13 2016-04-14 Continental Automotive Gmbh Vehicle window with a window heating and heating and sensor unit for a vehicle
AT518591B1 (en) 2016-05-11 2019-04-15 B & R Ind Automation Gmbh Illuminant with adjustable irradiance

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2424156A1 (en) * 1978-04-25 1979-11-23 Bayerische Motoren Werke Ag VEHICLE HEADLIGHT EQUIPPED WITH A CLOGGING DETECTOR
US4701613A (en) * 1984-11-09 1987-10-20 Nippondenso Co., Ltd. Electro-optical rain detector for windshields
US4652745A (en) * 1985-12-06 1987-03-24 Ford Motor Company Optical moisture sensor for a window or windshield
GB2186077A (en) * 1986-02-04 1987-08-05 Vaisala Oy Light transmission measurement equipment compensated for protective glass surfaces contamination
DE3703180A1 (en) * 1986-02-04 1987-08-06 Vaisala Oy METHOD AND DEVICE FOR MEASURING THE LIGHT TRANSMISSION
US4794266A (en) * 1986-02-04 1988-12-27 Vaisala Oy Method and apparatus for light transmission measurement by sending light, measuring received light and computing transmittance
GB2186077B (en) * 1986-02-04 1989-10-25 Vaisala Oy Method and apparatus for measuring light transmission
GB2208433A (en) * 1987-07-31 1989-03-30 Veglia Borletti Srl Detecting water droplets on a vehicle window and controlling windscreen wiper in response thereto
GB2360583A (en) * 2000-03-21 2001-09-26 Microflow Ltd Optical condensation monitor
WO2016058105A1 (en) * 2014-10-17 2016-04-21 Nima Nabavi Self-cleaning optical sensor assembly
US10632507B2 (en) 2014-10-17 2020-04-28 Excelsense Technologies Corp. Self-cleaning optical sensor assembly
US11173524B2 (en) 2014-10-17 2021-11-16 Excelsense Technologies Corp. Self-cleaning optical sensor assembly

Also Published As

Publication number Publication date
FR2004803A1 (en) 1969-12-05
SE353497B (en) 1973-02-05
DE1755074B1 (en) 1970-09-10

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