EP0370544A2 - Détecteur pour la surveillance du trafic - Google Patents

Détecteur pour la surveillance du trafic Download PDF

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Publication number
EP0370544A2
EP0370544A2 EP89202722A EP89202722A EP0370544A2 EP 0370544 A2 EP0370544 A2 EP 0370544A2 EP 89202722 A EP89202722 A EP 89202722A EP 89202722 A EP89202722 A EP 89202722A EP 0370544 A2 EP0370544 A2 EP 0370544A2
Authority
EP
European Patent Office
Prior art keywords
radiation
receiver
transmitter
survey sensor
oriented
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.)
Withdrawn
Application number
EP89202722A
Other languages
German (de)
English (en)
Other versions
EP0370544A3 (fr
Inventor
Antonio Vernaleone
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.)
Philips SpA
Original Assignee
Philips SpA
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 Philips SpA filed Critical Philips SpA
Publication of EP0370544A2 publication Critical patent/EP0370544A2/fr
Publication of EP0370544A3 publication Critical patent/EP0370544A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • This invention relates to a traffic survey sensor, in particular for motor vehicle traffic.
  • Traffic survey sensors are known of the type having a magnetic turn or a coaxial cable.
  • the object of the present invention is to overcome this drawback by accomplishing a traffic sensor which does not require installation under the road surface.
  • a traffic survey sensor characterized in that in comprises a transmitter and a receiver suitable for being located in a position above the surface under control, said transmitter comprising a source of radiation and means for converting the radiation into a beam of substantially parallel rays and said receiver comprising means for focussing said beam at a point of the receiver itself, the transmitter being oriented so as to direct the radiation towards a pre-set point of the surface under control and the receiver being oriented so as to receive the radiation reflected by said pre-set point.
  • a gate which at one extremity supports a transmitter 2 which comprises a source of radiation 3 and a lens 4 and, in a position symmetrical with respect to the centre line of the surface be controlled, a receiver 5 which includes a focussing lens 6.
  • Radiation emitted by source 3 is converted by lens 4 into a beam of substantially parallel rays 8 which, in the absence of vehicles, reaches a pre-set point 9 of the road surface 10, wherefrom it is partially reflected towards the receiver 5, inside which a focussing lens 6 focusses the reflected beam 14 at a sensing point 17 suitably connected to electrical means for processing the signal received.
  • a vehicle 11 In the case wherein a vehicle 11 is passing over the point of normal reflection 9, the latter is covered by the profile of the vehicle itself so that the beam 8 is reflected by a different surface, say, by the roof 12 or by the bonnet 13 of the vehicle, so that the angle of reflection is varied and with it the angle of incidence with which the reflected beam (15 or 16) arrives at collector 5, if it arrives at all.
  • the reflected beam is focussed at a point other than the pre­set one and no signal shall be obtained at point 17. The absence of the signal is thus used as an indication of the passage of a vehicle.
  • Fig. 2 there is shown the application of the system under examination for two-lane roads wherein there is one sensor for each lane. This number is considered sufficient for a good survey since, statistically, the vehicles which can cross the surface under control without being spotted by either of the two sensors are very few. It should be noted that the two sensors do not disturb and have no influence on one another.
  • a high accuracy of the survey is obtained, as it is possible to use a very small beam, say, 6-7 centimetres in diameter. This is obtainable by emitting radiation with a very small wavelength and a speed of propagation equal to that of light, say, an infrared radiation of the order of 900-950 nanometres.
  • Radiation is preferably emitted in constant-rate impulses so as to be able to use high power without causing any inconvenience to people.
  • High power makes for good results which cannot be affected by noise caused, say, by solar radiation and radiation emitted by passing vehicles.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Radar Systems Or Details Thereof (AREA)
EP19890202722 1988-11-21 1989-10-26 Détecteur pour la surveillance du trafic Withdrawn EP0370544A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8822672A IT1227370B (it) 1988-11-21 1988-11-21 Sensore di rilevamento del traffico.
IT2267288 1988-11-21

Publications (2)

Publication Number Publication Date
EP0370544A2 true EP0370544A2 (fr) 1990-05-30
EP0370544A3 EP0370544A3 (fr) 1990-12-12

Family

ID=11199117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890202722 Withdrawn EP0370544A3 (fr) 1988-11-21 1989-10-26 Détecteur pour la surveillance du trafic

Country Status (2)

Country Link
EP (1) EP0370544A3 (fr)
IT (1) IT1227370B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1209485A2 (fr) * 2000-11-28 2002-05-29 Valeo Schalter und Sensoren GmbH Procédé et dispositif de capteur d'un zone prédéterminé

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1187801A (en) * 1966-04-08 1970-04-15 Evr Eclairage Vehicules Rail Improvements in or relating to Devices for the Detection of Vehicles
DE3013950A1 (de) * 1980-04-11 1981-10-15 Kienzle Apparate Gmbh, 7730 Villingen-Schwenningen Reflexionslichtschranke, insbesondere fuer einen stellflaechensensor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1187801A (en) * 1966-04-08 1970-04-15 Evr Eclairage Vehicules Rail Improvements in or relating to Devices for the Detection of Vehicles
DE3013950A1 (de) * 1980-04-11 1981-10-15 Kienzle Apparate Gmbh, 7730 Villingen-Schwenningen Reflexionslichtschranke, insbesondere fuer einen stellflaechensensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1209485A2 (fr) * 2000-11-28 2002-05-29 Valeo Schalter und Sensoren GmbH Procédé et dispositif de capteur d'un zone prédéterminé
EP1209485A3 (fr) * 2000-11-28 2003-12-10 Valeo Schalter und Sensoren GmbH Procédé et dispositif de capteur d'un zone prédéterminé

Also Published As

Publication number Publication date
IT1227370B (it) 1991-04-08
EP0370544A3 (fr) 1990-12-12
IT8822672A0 (it) 1988-11-21

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