FR2386028A1 - Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigrade - Google Patents

Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigrade

Info

Publication number
FR2386028A1
FR2386028A1 FR7709128A FR7709128A FR2386028A1 FR 2386028 A1 FR2386028 A1 FR 2386028A1 FR 7709128 A FR7709128 A FR 7709128A FR 7709128 A FR7709128 A FR 7709128A FR 2386028 A1 FR2386028 A1 FR 2386028A1
Authority
FR
France
Prior art keywords
windscreen
stuck
crystals
vehicles
multiple film
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Withdrawn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
FR7709128A
Other languages
French (fr)
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7709128A priority Critical patent/FR2386028A1/en
Publication of FR2386028A1 publication Critical patent/FR2386028A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
    • G01K11/16—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01W—METEOROLOGY
    • G01W1/00—Meteorology
    • G01W1/14—Rainfall or precipitation gauges

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Atmospheric Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The vehicle frost indicator consists of a multiple film enclosing liquid crystals, for example cholesterics. The liquid crystals give instantaneous display of the temperature by light emission in the visible spectrum range. The film is stuck directly onto the windscreen or the surface of the exterior rear view mirror. Whatever the interior temperature of the vehicle, the thermal resistance of the windscreen is sufficient to ensure that the film is in equilibrium with the exterior air as soon as the vehicle moves. The liquid crystals are arranged to display a lette for example F for frost or I for ice and will take a determine spectral colour for an exterior temperature less then +1 deg.C.
FR7709128A 1977-03-28 1977-03-28 Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigrade Withdrawn FR2386028A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7709128A FR2386028A1 (en) 1977-03-28 1977-03-28 Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigrade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7709128A FR2386028A1 (en) 1977-03-28 1977-03-28 Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigrade

Publications (1)

Publication Number Publication Date
FR2386028A1 true FR2386028A1 (en) 1978-10-27

Family

ID=9188631

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7709128A Withdrawn FR2386028A1 (en) 1977-03-28 1977-03-28 Icing risk indicator for vehicles - uses multiple film containing liq. crystals, stuck on windscreen, giving colour change under one degree centigrade

Country Status (1)

Country Link
FR (1) FR2386028A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4316557A1 (en) * 1993-05-18 1994-11-24 Hella Kg Hueck & Co Device for detecting the degree of misting or icing of a motor vehicle pane (window)
EP0989392A1 (en) * 1998-09-23 2000-03-29 Britax (Geco) S.A. Temperature indicator for motor vehicle
WO2000079230A1 (en) * 1999-06-08 2000-12-28 Array Displays Ab Temperature indicator comprising a temperature sensitive material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4316557A1 (en) * 1993-05-18 1994-11-24 Hella Kg Hueck & Co Device for detecting the degree of misting or icing of a motor vehicle pane (window)
EP0989392A1 (en) * 1998-09-23 2000-03-29 Britax (Geco) S.A. Temperature indicator for motor vehicle
US6592255B1 (en) 1998-09-23 2003-07-15 Bernard Duroux Temperature indicator for motor vehicle
WO2000079230A1 (en) * 1999-06-08 2000-12-28 Array Displays Ab Temperature indicator comprising a temperature sensitive material

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Legal Events

Date Code Title Description
ST Notification of lapse