JPS56157860A - Measuring method for running speed of vehicle - Google Patents
Measuring method for running speed of vehicleInfo
- Publication number
- JPS56157860A JPS56157860A JP6143580A JP6143580A JPS56157860A JP S56157860 A JPS56157860 A JP S56157860A JP 6143580 A JP6143580 A JP 6143580A JP 6143580 A JP6143580 A JP 6143580A JP S56157860 A JPS56157860 A JP S56157860A
- Authority
- JP
- Japan
- Prior art keywords
- output
- vehicle
- coil
- running speed
- sensor
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
- G01P3/66—Devices characterised by the determination of the time taken to traverse a fixed distance using electric or magnetic means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
PURPOSE:To eliminate a change in sensitivity due to a car height and a speed, by a method wherein, in a method to measure a running speed through sensing of a vehicle by means of sensors imbedded in a road surface at given intervals, a flux gate type magnetic field sensor and a magnet are employed. CONSTITUTION:A ring core 1 and a sensor coil 2 are rolled around a permalloy ring core 1, and an output of a low-frequency oscillator 4 is amplified at a device 5. So amplified output is supplied to a coil 3, and as a result, an output is produced from the coil 2 and is inputted to a phase detector 6 through a band-pass filter 5'. The other output of the oscillator 4 is multiplied 2 times by means of a frequency multiplier 7, and is inputted to the phase detector 6 via a phase shifter 8. A magnitude of a magnetic field can be meausured through the reading of the output of the detector 6 via a filter 9. A plural number of said sensors are imbedded in a road surface, and a running speed is obtained from a time difference through the detection of a magnet piece on a vehicle. The sensor has an enough sensitivity against even a vehicle having a height of over 500cm, and thereby a high-precise measurement can be performed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6143580A JPS56157860A (en) | 1980-05-09 | 1980-05-09 | Measuring method for running speed of vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6143580A JPS56157860A (en) | 1980-05-09 | 1980-05-09 | Measuring method for running speed of vehicle |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56157860A true JPS56157860A (en) | 1981-12-05 |
Family
ID=13170980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6143580A Pending JPS56157860A (en) | 1980-05-09 | 1980-05-09 | Measuring method for running speed of vehicle |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56157860A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5029076A (en) * | 1973-07-18 | 1975-03-24 | ||
JPS52138977A (en) * | 1976-05-14 | 1977-11-19 | Tokyo Aircraft Instr Co | System for measuring vehicle speed |
-
1980
- 1980-05-09 JP JP6143580A patent/JPS56157860A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5029076A (en) * | 1973-07-18 | 1975-03-24 | ||
JPS52138977A (en) * | 1976-05-14 | 1977-11-19 | Tokyo Aircraft Instr Co | System for measuring vehicle speed |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DK0532604T3 (en) | Sub-audio magnetic instrument | |
JPS56157860A (en) | Measuring method for running speed of vehicle | |
JPS55156810A (en) | Displacement detector | |
JPS55101044A (en) | Flaw detector | |
ATE15553T1 (en) | METHOD AND ARRANGEMENT FOR DETERMINING A MAGNETIC FIELD. | |
JPS5548602A (en) | Steel rope surface unevenness detection measuring method via magnetism-sensitive element | |
JPS5757204A (en) | Method of measuring thickness of film formed on surface of ferromagnetic substance | |
SU1096564A1 (en) | Method of checking of moving lengthy ferromagnetic objects | |
SU670879A1 (en) | Device for magnetic-noise inspection of ferromagnetic materials | |
SU365554A1 (en) | METHOD FOR REGISTRATION OF ELECTROMAGNETIC PARAMETERS | |
JPS5633556A (en) | Noncontact measuring device for revolution number of gasoline engine car | |
JPS55121109A (en) | Temperature correcting method as to hardness measurement and foreign-material sorting making use of eddy current | |
SU951206A1 (en) | Ferroprobe | |
SU864106A1 (en) | Method of magnetic noise structuroscopy of articles from ferromagnetic materials | |
SU1165970A1 (en) | Method of structuroscopy of ferromagnetic articles | |
SU411367A1 (en) | ||
SU391464A1 (en) | METHOD FOR CONTROLLING THE SIZE OF CRUSHED FERROMAGNETIC MATERIAL IN A FLOW | |
SU446003A1 (en) | Method for measuring the intensity of the starting field of a magnetic film | |
SU729537A1 (en) | Digital differential proton magnetometer | |
SU593230A1 (en) | Vehicle registration device | |
JPS6439571A (en) | Method and device for measuring magnetic permeability | |
SU130191A1 (en) | Electromagnetic device for controlling the thickness of metal products | |
SU761965A1 (en) | Permanent magnet residual magnetisation measuring apparatus | |
SU373517A1 (en) | ANGULAR DISPLACEMENT CONVERTER | |
SU998934A1 (en) | Pulse magnetic analyzer |