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ES338922A1 - Improvements in or relating to Devices for the Detection of Vehicles - Google Patents

Improvements in or relating to Devices for the Detection of Vehicles

Info

Publication number
ES338922A1
ES338922A1 ES338922A ES338922A ES338922A1 ES 338922 A1 ES338922 A1 ES 338922A1 ES 338922 A ES338922 A ES 338922A ES 338922 A ES338922 A ES 338922A ES 338922 A1 ES338922 A1 ES 338922A1
Authority
ES
Spain
Prior art keywords
beams
detectors
road
photo
length
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.)
Expired
Application number
ES338922A
Other languages
Spanish (es)
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.)
Eclairage des Vehicules Sur Rail EVR SA
Original Assignee
Eclairage des Vehicules Sur Rail EVR SA
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
Priority claimed from FR57099A external-priority patent/FR1481269A/en
Application filed by Eclairage des Vehicules Sur Rail EVR SA filed Critical Eclairage des Vehicules Sur Rail EVR SA
Publication of ES338922A1 publication Critical patent/ES338922A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

A photo-electric vehicle detector comprises an optical source 11 disposed above the road and directing at least two beams on to reflecting or absorbing pads 21, 22 on the road surface, the reflected beams being received by associated detectors 16 and 17. The radiation is infra-red produced by a photo-emissive diode or by a laser, and is preferably modulated, e.g. pulsed, to avoid interference from other light sources. Two detectors spaced apart along the length of a road may be used to measure the speed or length of a vehicle, and in one arrangement (Fig. 2, not shown) the centre lane of a three-lane dual carriageway is provided with two such detectors and the outer lanes with one each. The arrangement shown in Fig. 1 uses refractive elements to produce the beams in modifications (Figs. 3-5, not shown) the beams are produced by one or more parabolic mirrors.
ES338922A 1966-04-08 1967-04-05 Improvements in or relating to Devices for the Detection of Vehicles Expired ES338922A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR57099A FR1481269A (en) 1966-04-08 1966-04-08 Vehicle detector
FR77521A FR90912E (en) 1966-04-08 1966-09-23 Vehicle detector

Publications (1)

Publication Number Publication Date
ES338922A1 true ES338922A1 (en) 1968-04-16

Family

ID=26169862

Family Applications (1)

Application Number Title Priority Date Filing Date
ES338922A Expired ES338922A1 (en) 1966-04-08 1967-04-05 Improvements in or relating to Devices for the Detection of Vehicles

Country Status (4)

Country Link
DE (1) DE1574061B1 (en)
ES (1) ES338922A1 (en)
FR (1) FR90912E (en)
GB (1) GB1187801A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1227370B (en) * 1988-11-21 1991-04-08 Philips Spa TRAFFIC DETECTION SENSOR.
FI83822C (en) * 1989-02-02 1991-08-26 Valtion Teknillinen Procedure and apparatus for observing traffic conditions
FR2674643B1 (en) * 1991-03-29 1993-07-02 Elsydel METHOD FOR GENERATING LINEAR IMAGES OF MOVING OBJECTS, IN PARTICULAR OF VEHICLES, SYSTEMS FOR IMPLEMENTING SAME AND APPLICATION OF SUCH SYSTEMS TO THE AUTOMATIC DETERMINATION OF VEHICLE CATEGORY.
ITFI20120009A1 (en) * 2012-01-17 2013-07-18 Paolo Sodi "SYSTEM AND METHOD FOR DETECTING INFRINGEMENT OF ROAD CIRCULATION RULES"

Also Published As

Publication number Publication date
GB1187801A (en) 1970-04-15
DE1574061B1 (en) 1972-03-09
FR90912E (en) 1968-03-08

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