JPS5681452A - Loop coil for vehicle speed detecting device - Google Patents

Loop coil for vehicle speed detecting device

Info

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
Application number
JP15900779A
Other languages
Japanese (ja)
Other versions
JPS6026461B2 (en
Inventor
Ryohei Itaya
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.)
TOKYO AIRCRAFT INSTR CO
Tokyo Koku Keiki KK
Original Assignee
TOKYO AIRCRAFT INSTR CO
Tokyo Koku Keiki KK
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 TOKYO AIRCRAFT INSTR CO, Tokyo Koku Keiki KK filed Critical TOKYO AIRCRAFT INSTR CO
Priority to JP54159007A priority Critical patent/JPS6026461B2/en
Publication of JPS5681452A publication Critical patent/JPS5681452A/en
Publication of JPS6026461B2 publication Critical patent/JPS6026461B2/en
Expired legal-status Critical Current

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
JP54159007A 1979-12-07 1979-12-07 Loop coil for vehicle detection equipment Expired JPS6026461B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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