JPS5647737A - Detection of condition of road surface - Google Patents
Detection of condition of road surfaceInfo
- Publication number
- JPS5647737A JPS5647737A JP12488179A JP12488179A JPS5647737A JP S5647737 A JPS5647737 A JP S5647737A JP 12488179 A JP12488179 A JP 12488179A JP 12488179 A JP12488179 A JP 12488179A JP S5647737 A JPS5647737 A JP S5647737A
- Authority
- JP
- Japan
- Prior art keywords
- condition
- road surface
- output
- level
- receiver
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/14—Rainfall or precipitation gauges
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
- G08B19/02—Alarm responsive to formation or anticipated formation of ice
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F27/00—Combined visual and audible advertising or displaying, e.g. for public address
- G09F27/005—Signs associated with a sensor
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F7/00—Signs, name or number plates, letters, numerals, or symbols; Panels or boards
- G09F2007/005—Signs associated with a sensor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Theoretical Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Atmospheric Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental Sciences (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
PURPOSE:To detect condition of frozen road surface accurately without being affected by sprayed snow-melting agent and variation in meteorological conditions, ete., by detecting condition of freezing by determining difference in near infrared absorption between water and ice using a road surface condition determining circuit. CONSTITUTION:A light-projecting passage 3 is attached to the top of a supporting column 5, and an infrared ray receiver 1 and a visible light receiver 2 are attached to a supporting arm 6. An infrared ray reflecting light signal put out from the light receiver 1 is amplified to an appropriate level by an amplifier 11 and sent over to a low region passing filter 12 to have the outside turbulence noise removed and then put into comparators 13 and 14. A visible light reflecting light signal put out from the light receiver 2 is also processed in the same manner. A discriminating level A1 is set between output level of a filter 12 in frozen condition and the same output level in snow-covered or wet condition, and an output 1 is generated when the output A1 is exceeded.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12488179A JPS601574B2 (en) | 1979-09-27 | 1979-09-27 | Road surface condition detection method |
DE19803023444 DE3023444C2 (en) | 1979-06-29 | 1980-06-23 | Device for determining the weather-related road conditions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12488179A JPS601574B2 (en) | 1979-09-27 | 1979-09-27 | Road surface condition detection method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5647737A true JPS5647737A (en) | 1981-04-30 |
JPS601574B2 JPS601574B2 (en) | 1985-01-16 |
Family
ID=14896397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12488179A Expired JPS601574B2 (en) | 1979-06-29 | 1979-09-27 | Road surface condition detection method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS601574B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01154868A (en) * | 1987-12-11 | 1989-06-16 | Nkk Corp | Cold scarfer |
-
1979
- 1979-09-27 JP JP12488179A patent/JPS601574B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS601574B2 (en) | 1985-01-16 |
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