JPS5681452A - Loop coil for vehicle speed detecting device - Google Patents
Loop coil for vehicle speed detecting deviceInfo
- Publication number
- JPS5681452A JPS5681452A JP15900779A JP15900779A JPS5681452A JP S5681452 A JPS5681452 A JP S5681452A JP 15900779 A JP15900779 A JP 15900779A JP 15900779 A JP15900779 A JP 15900779A JP S5681452 A JPS5681452 A JP S5681452A
- Authority
- JP
- Japan
- Prior art keywords
- vehicle
- loop coil
- road surface
- auxiliary
- vehicle speed
- 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
Landscapes
- Traffic Control Systems (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
PURPOSE: To enable installation of a vehicle speed device of a loop type system by using an auxiliary loop coil and thereby enhancing the sensitivity of detection even when steel bar or steel frames are embedded in a roadbed.
CONSTITUTION: The loop coil (hereinafter shown by LC) 1 in a vehicle speed measuring device is devised so that the speed of a vehicle is measured by detecting the passage of the vehicle 4 through the utilization of the apparent change in inductance caused when the LC1 buried under a road surface and supplied with a high-frequency current is connected electromagnetically with the vehicle 4 running on the road surface. By embedding the LC1 for detecting the vehicle and the auxiliary LC2 in layers on the conductor of the roadbed, coupling the auxiliary LC2 to the LC1 for detection and supplying thereto the current having the same frequency with the current supplied to the LC1 for detection and keeping a fixed relation of phase, the vehicle 4 can be detected with high sensitivity even when there is the connection of the steel bars 3 and the like embedded under the road surface.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54159007A JPS6026461B2 (en) | 1979-12-07 | 1979-12-07 | Loop coil for vehicle detection equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54159007A JPS6026461B2 (en) | 1979-12-07 | 1979-12-07 | Loop coil for vehicle detection equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5681452A true JPS5681452A (en) | 1981-07-03 |
JPS6026461B2 JPS6026461B2 (en) | 1985-06-24 |
Family
ID=15684195
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54159007A Expired JPS6026461B2 (en) | 1979-12-07 | 1979-12-07 | Loop coil for vehicle detection equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6026461B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013092410A (en) * | 2011-10-25 | 2013-05-16 | Miki Giken:Kk | Installation structure of metal body detection loop coil |
-
1979
- 1979-12-07 JP JP54159007A patent/JPS6026461B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013092410A (en) * | 2011-10-25 | 2013-05-16 | Miki Giken:Kk | Installation structure of metal body detection loop coil |
Also Published As
Publication number | Publication date |
---|---|
JPS6026461B2 (en) | 1985-06-24 |
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