EP0867018B1 - Device for detecting the presence and direction of passage of mobiles and persons with the view to counting them - Google Patents

Device for detecting the presence and direction of passage of mobiles and persons with the view to counting them Download PDF

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Publication number
EP0867018B1
EP0867018B1 EP95942739A EP95942739A EP0867018B1 EP 0867018 B1 EP0867018 B1 EP 0867018B1 EP 95942739 A EP95942739 A EP 95942739A EP 95942739 A EP95942739 A EP 95942739A EP 0867018 B1 EP0867018 B1 EP 0867018B1
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Prior art keywords
reception
optical
elements
distance
mobiles
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German (de)
French (fr)
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EP0867018A1 (en
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Michel Brime S.A. Z.A. Courtaboeuf LEBLANC
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BRIME TECHNOLOGIES
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BRIME TECHNOLOGIES
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M11/00—Counting of objects distributed at random, e.g. on a surface
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00—Design features of general application
    • G06M1/08—Design features of general application for actuating the drive
    • G06M1/10—Design features of general application for actuating the drive by electric or magnetic means
    • G06M1/101—Design features of general application for actuating the drive by electric or magnetic means by electro-optical means
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit

Definitions

  • the present invention relates to a device for detecting the presence and determine the direction of passage of mobiles for counting.
  • the term "mobile” applies as much to an object as to a living being.
  • Detection and determination of the direction of passage of mobiles is usually done at using a mechanical infrastructure such as turnstiles or gates, or optical systems with cutting of beams.
  • the turnstiles generally have three branches. One person crossing the turnstile turns it a third of a turn. This rotation constitutes the detection, and an external system can count the number of people who passed.
  • This device requires a large and expensive ground infrastructure. It causes a slowdown the flow of pedestrians having to pass the turnstile, by a bottleneck effect, and can only work in one direction of passage.
  • Another known device uses an infrared barrier, consisting of an emitting part and a receiving part placed opposite each other and thus forming a immaterial line. A pedestrian crossing this line is detected by the non reception of the beam light coming from the transmitter.
  • Infrared barriers need to be placed at a distance from the ground compatible with the size of the mobiles to be detected. Detecting people therefore requires place the barrier about one meter high, which requires supporting infrastructure. This arrangement of the sensor at one meter from the ground does not protect it from acts of vandalism.
  • FR-2 431 738 describes a detection device in which the reception elements must be inclined towards the detection zones, which requires adjustments during installation specific delicate, long and expensive, and is expensive to manufacture.
  • the invention aims to overcome these drawbacks and relates to a device according to the claim 1.
  • the device according to the invention is fixed to the vertical of the mobiles to be detected (ceiling by example), which does not require any infrastructure on the ground and makes it more safe from possible acts of vandalism.
  • it is in the form of a monoblock, thus not requiring two separate elements, unlike the infrared barrier. This provision does not generate slowdown in the flow of mobile flow.
  • the device includes a housing comprising firstly two transmitters (1 and 4) each having the function of emitting a beam towards a mobile by means of optical means, secondly a reception system consisting of two elements (2 and 3) capturing the beam reflected by the mobile passing through the detection zone via reception optics and, thirdly, electronic control elements transmitting (1 and 4) and processing signals received by the receiving elements (2 and 3).
  • the first and second transmitters (1 and 4), as well as the reception elements, are diodes infrared.
  • Electronic control of each transmission and signal processing element received by each receiving element comprises a clock (17) generating a pulse driving each emission element, an amplifier (18) amplifying the light signals generated by each receiving element, and a biomarker sampler (19) synchronizes with said clock to block the amplified signals and compare them with a voltage of reference by means of a comparator (20).
  • the device integrates two synchronized infrared transmitters and receivers allowing generate in the direction of passage of the mobiles two detection zones in space.
  • the existence of these two virtual detection zones makes it possible to determine the direction of passage of the mobiles by direct reflection.
  • the transmitting elements continuously emit light pulses. Resting, when no mobile is present, the receivers receive no signal. When a mobile passes through the sensor detection zone, this zone being between a minimum distance and at a maximum distance, it meets a first beam. This beam is reflected on the mobile and is detected by the first receiver. Continuing its movement, the mobile then cuts the second beam. The second beam is reflected on the mobile and is detected by the second receiver. The chronology of the light beams received makes it possible to determine the direction of passage of the mobile.
  • the device comprises two transmitters of the infrared diode type (1 and 4).
  • the light emitted by these infrared emitters is focused using an optical device of emission (5 and 7).
  • a mobile cutting the beam emitted by the first infrared transmitter (1) reflects this beam.
  • the reflected beam (10) passes through the reception optics (6) to reach the first receiving element (3).
  • a signal is then received by the first receiving element (3).
  • the mobile continuing its movement cuts the beam emitted by the second transmitter infrared (4), and reflects this beam.
  • the reflected beam (11) passes through the reception optics (6) to reach the second receiving element (2).
  • a signal is then received by the second element reception (2).
  • the signals received on the reception elements (2 and 3) make it possible to know the presence and the direction of passage of the mobile. If the first receiving element (3) receives a signal before the secondarily receiving (2), the mobile moves in a direction from the first element transmission (1) to the second transmission element (4). If the second receiving element (2) receives a signal before the first receiving element (3), the mobile moves in a direction from second transmission element (4) to the first transmission element (1).
  • the device according to the invention allows the detection of mobiles cutting the beam emitted by the first transmitter (1) over an area between a minimum distance (12) and a maximum distance (14). It allows the detection of mobiles cutting the beam emitted by the second infrared emitter (4) over an area between a minimum distance (13) and a maximum distance (15).
  • the maximum (14) and minimum (12) distances are determined by the focal length (16) of the reception optics (6) , the size of the sensitive surface of the first reception element (3), the distance (9) between the first reception element (3) and the axis of the reception optics (6), the distance between the transmission optics (5) and the reception optics (6).
  • the maximum (15) and minimum (13) distances are determined by the focal length (16) of the reception optics (6), the size of the sensitive surface of the first reception element (2), the distance (8) between the second reception element (2) and the axis of the reception optics (6), the distance between the transmission optics (7) and the reception optics (6).
  • the transmission elements (1 and 4) are driven by pulses supplied by a clock (17).
  • the pulsed light signals received by the receiving elements (2 and 3) are amplified by means of an amplifier (18).
  • the received signals are blocked synchronously to the transmission clock by means of a blocking sampler (19), to be able to be compared to a reference voltage in a comparator (20). The result of this comparison gives the output signal 1 and the output signal 2.
  • Figure 4 shows the timing diagrams of the output signals (output 1 and output 2) for a mobile passing in the direction of first transmission element (1) towards second transmission element (2).
  • Niche-shaped signals appear when the receiving elements are not receive more signal.
  • FIG. 5 represents the timing diagrams of the output signals (output 1 and output 2) for a mobile passing in the direction of second transmission element (2) towards first transmission element (1).
  • Niche-shaped signals appear when the receiving elements are not receive more signal.
  • the device can be provided with 2 reception optics, each being associated with a receiving element (2 and 3).
  • the main industrial applications of the device are in particular the detection and determination of the direction of passage of mobiles moving alone or in a group and in various places for counting. For example, this is the count of people entering and leaving a means of transport for people (metro, bus, train ...) or a public or private place, metering in particular of objects passing on a conveyor belt, counting of vehicles ...

Description

La présente invention concerne un dispositif permettant de détecter la présence et de déterminer le sens de passage de mobiles en vue du comptage. Le terme de « mobile » s'applique autant à un objet qu'à un être vivant.The present invention relates to a device for detecting the presence and determine the direction of passage of mobiles for counting. The term "mobile" applies as much to an object as to a living being.

La détection et la détermination du sens de passage de mobiles sont habituellement faites à l'aide d'une infrastructure mécanique de type tourniquets ou portillons, ou de systèmes optiques à coupure de faisceaux. Les tourniquets disposent généralement de trois branches. Une personne franchissant le tourniquet fait tourner celui-ci d'un tiers de tour. Cette rotation constitue la détection, et un système externe peut comptabiliser le nombre de personnes qui sont passées. Ce dispositif nécessite une infrastructure au sol importante et coûteuse. Il provoque un ralentissement du flux de piétons devant passer le tourniquet, par un effet de goulot, et ne peut fonctionner que dans un seul sens de passage. Un autre dispositif connu met en oeuvre une barrière infrarouge, constituée d'une partie émettrice et d'une partie réceptrice mises en regard et formant ainsi une ligne immatérielle. Un piéton coupant cette ligne est détecté par la non réception du faisceau lumineux provenant de l'émetteur. Un système externe peut ainsi compter le nombre de personnes ayant franchi la barrière. Les barrières infrarouges nécessitent d'être placées à une distance du sol compatible avec la taille des mobiles à détecter. Ainsi, la détection de personnes nécessite de placer la barrière à un mètre de hauteur environ, ce qui nécessite une infrastructure de soutien. Cette disposition du capteur à un mètre du sol ne le met pas à l'abri des actes de vandalisme.Detection and determination of the direction of passage of mobiles is usually done at using a mechanical infrastructure such as turnstiles or gates, or optical systems with cutting of beams. The turnstiles generally have three branches. One person crossing the turnstile turns it a third of a turn. This rotation constitutes the detection, and an external system can count the number of people who passed. This device requires a large and expensive ground infrastructure. It causes a slowdown the flow of pedestrians having to pass the turnstile, by a bottleneck effect, and can only work in one direction of passage. Another known device uses an infrared barrier, consisting of an emitting part and a receiving part placed opposite each other and thus forming a immaterial line. A pedestrian crossing this line is detected by the non reception of the beam light coming from the transmitter. An external system can count the number of people having crossed the barrier. Infrared barriers need to be placed at a distance from the ground compatible with the size of the mobiles to be detected. Detecting people therefore requires place the barrier about one meter high, which requires supporting infrastructure. This arrangement of the sensor at one meter from the ground does not protect it from acts of vandalism.

FR-2 431 738 décrit un dispositif de détection dans lequel les éléments de réception doivent être inclinés en direction des zones de détection, ce qui nécessite, à l'installation, des réglages spécifiques délicats, longs et coûteux, et est coûteux à la fabrication.FR-2 431 738 describes a detection device in which the reception elements must be inclined towards the detection zones, which requires adjustments during installation specific delicate, long and expensive, and is expensive to manufacture.

L'invention vise à pallier ces inconvénients et concerne un dispositif conforme à la revendication 1.The invention aims to overcome these drawbacks and relates to a device according to the claim 1.

Les revendications dépendantes concernent d'autres formes de réalisation de l'invention.The dependent claims relate to other embodiments of the invention.

Le dispositif selon l'invention se fixe à la verticale des mobiles à détecter (plafond par exemple), ce qui ne nécessite aucune infrastructure au sol et le met plus à l'abri d'éventuels actes de vandalisme. De plus, il se présente sous forme d'un monobloc, ne nécessitant ainsi pas deux éléments séparés, contrairement à la barrière infrarouge. Cette disposition ne génère pas de ralentissement dans l'écoulement du flux des mobiles. Le dispositif, selon une première caractéristique, comporte un boítier comprenant d'une première part deux émetteurs (1 et 4) ayant pour fonction d'émettre chacun un faisceau en direction d'un mobile par l'intermédiaire de moyens optiques, d'une seconde part un système de réception constitué de deux éléments (2 et 3) captant le faisceau réfléchi par le mobile passant dans la zone de détection par l'intermédiaire d'une optique de réception, et d'une troisième part une électronique de pilotage des éléments d'émission (1 et 4) et de traitement des signaux reçus par les éléments de réception (2 et 3). Les premier et second émetteurs (1 et 4), ainsi que les éléments de réception, sont des diodes infrarouges. L'électronique de pilotage de chaque élément d'émission et de traitement des signaux reçus par chaque élément de réception comporte une horloge (17) génératrice d'impulsion pilotant chaque élément d'émission, un amplificateur (18) amplifiant les signaux lumineux générés par chaque élément de réception, et un échantillonneur bioqueur (19) synchronise avec ladite horloge permettant de bloquer les signaux amplifiés et de comparer ceux-ci à une tension de référence au moyen d'un comparateur (20). The device according to the invention is fixed to the vertical of the mobiles to be detected (ceiling by example), which does not require any infrastructure on the ground and makes it more safe from possible acts of vandalism. In addition, it is in the form of a monoblock, thus not requiring two separate elements, unlike the infrared barrier. This provision does not generate slowdown in the flow of mobile flow. The device, according to a first characteristic, includes a housing comprising firstly two transmitters (1 and 4) each having the function of emitting a beam towards a mobile by means of optical means, secondly a reception system consisting of two elements (2 and 3) capturing the beam reflected by the mobile passing through the detection zone via reception optics and, thirdly, electronic control elements transmitting (1 and 4) and processing signals received by the receiving elements (2 and 3). The first and second transmitters (1 and 4), as well as the reception elements, are diodes infrared. Electronic control of each transmission and signal processing element received by each receiving element comprises a clock (17) generating a pulse driving each emission element, an amplifier (18) amplifying the light signals generated by each receiving element, and a biomarker sampler (19) synchronizes with said clock to block the amplified signals and compare them with a voltage of reference by means of a comparator (20).

La disposition des systèmes d'émission et de réception est conforme aux relations suivantes: x1 = f d min1 xD1 x1+ t = f d max1 xD1 x2 = f dmin2 xD2 x2 + t = f dmax2 xD2 avec :

  • t: la taille des éléments de réception (2 et 3)
  • dmin1: distance minimale (12)
  • dmax1: distance maximale (14)
  • dmin2: distance minimale (13)
  • dmax2: distance maximale (15)
  • D1 : l'entraxe entre la première optique d'émission (5) et l'optique de réception (6)
  • D2: l'entraxe entre la seconde optique d'émission (7) et l'optique de réception (6)
  • f: la distance focale de réception (16)
  • x1: la distance (9) entre le premier élément de réception (3) et l'axe de l'optique de réception (6)
  • x2: la distance (8) entre le second élément de réception (2) et l'axe de l'optique de réception (6)
    • The layout of the transmission and reception systems complies with the following relationships: x 1 = f d min1 xD 1 x 1+ t = f d max1 xD 1 x 2 = f d min2 xD 2 x 2 + t = f d max2 xD 2 with:
  • t: the size of the receiving elements (2 and 3)
  • dmin1: minimum distance (12)
  • dmax1: maximum distance (14)
  • dmin2: minimum distance (13)
  • dmax2: maximum distance (15)
  • D1: the distance between the first transmission optics (5) and the reception optics (6)
  • D2: the distance between the second transmission optics (7) and the reception optics (6)
  • f: the focal length of reception (16)
  • x1: the distance (9) between the first receiving element (3) and the axis of the receiving optics (6)
  • x2: the distance (8) between the second receiving element (2) and the axis of the receiving optics (6)

    • Le dispositif intègre deux émetteurs et deux récepteurs infrarouges synchronisés permettant de générer dans le sens de passage des mobiles deux zones de détection dans l'espace. L'existence de ces deux zones de détection virtuelles permet de déterminer le sens de passage des mobiles par réflexion directe.The device integrates two synchronized infrared transmitters and receivers allowing generate in the direction of passage of the mobiles two detection zones in space. The existence of these two virtual detection zones makes it possible to determine the direction of passage of the mobiles by direct reflection.

    Les éléments d'émission émettent en permanence des impulsions lumineuses. Au repos, lorsqu'aucun mobile n'est présent, les récepteurs ne reçoivent aucun signal. Lorsqu'un mobile passe dans la zone de détection du capteur, cette zone étant comprise entre une distance minimale et une distance maximale, il rencontre un premier faisceau. Ce faisceau se réfléchit sur le mobile et est détecté par le premier récepteur. En poursuivant son déplacement, le mobile coupe ensuite le second faisceau. Le second faisceau se réfléchit sur le mobile et est détecté par le second récepteur. La chronologie des faisceaux lumineux reçus permet de déterminer le sens de passage du mobile.The transmitting elements continuously emit light pulses. Resting, when no mobile is present, the receivers receive no signal. When a mobile passes through the sensor detection zone, this zone being between a minimum distance and at a maximum distance, it meets a first beam. This beam is reflected on the mobile and is detected by the first receiver. Continuing its movement, the mobile then cuts the second beam. The second beam is reflected on the mobile and is detected by the second receiver. The chronology of the light beams received makes it possible to determine the direction of passage of the mobile.

    L'existence d'une zone de détection comprise entre une distance minimale et une distance maximale permet de rendre le dispositif insensible à la nature du support sur lequel se déplacent les mobiles. Ces distances permettent de détecter uniquement des mobiles ayant une dimension déterminée. Les dessins annexés illustrent l'invention:

    • figure 1: cette figure représente le dispositif selon l'invention.
    • figure 2: cette figure représente les distances minimales et distances maximales de détection.
    • figure 3 : cette figure représente le synoptique de l'électronique utilisée pour le dispositif.
    • figure 4 et 5 : ces figures représentent les chronogrammes des signaux de sortie
    The existence of a detection zone between a minimum distance and a maximum distance makes it possible to make the device insensitive to the nature of the support on which the mobiles move. These distances make it possible to detect only mobiles having a determined dimension. The accompanying drawings illustrate the invention:
    • Figure 1: This figure shows the device according to the invention.
    • figure 2: this figure represents the minimum and maximum detection distances.
    • Figure 3: This figure shows the block diagram of the electronics used for the device.
    • figure 4 and 5: these figures represent the timing diagrams of the output signals

    En référence à la figure 1, le dispositif comporte deux émetteurs de type diode infrarouge (1 et 4). La lumière émise par ces émetteurs infrarouges est focalisée à l'aide d'un dispositif optique d'émission (5 et 7).With reference to FIG. 1, the device comprises two transmitters of the infrared diode type (1 and 4). The light emitted by these infrared emitters is focused using an optical device of emission (5 and 7).

    Un mobile coupant le faisceau émis par le premier émetteur infrarouge (1), réfléchit ce faisceau. Le faisceau réfléchi (10) traverse l'optique de réception (6) pour atteindre le premier élément de réception (3). Un signal est alors reçu par le premier élément de réception (3).A mobile cutting the beam emitted by the first infrared transmitter (1) reflects this beam. The reflected beam (10) passes through the reception optics (6) to reach the first receiving element (3). A signal is then received by the first receiving element (3).

    Le mobile continuant son déplacement coupe le faisceau émis par le second émetteur infrarouge (4), et réfléchit ce faisceau. Le faisceau réfléchi (11) traverse l'optique de réception (6) pour atteindre le second élément de réception (2). Un signal est alors reçu par le second élément de réception (2).The mobile continuing its movement cuts the beam emitted by the second transmitter infrared (4), and reflects this beam. The reflected beam (11) passes through the reception optics (6) to reach the second receiving element (2). A signal is then received by the second element reception (2).

    Les signaux reçus sur les éléments de réception (2 et 3) permettent de connaítre la présence et le sens de passage du mobile. Si le premier élément de réception (3) reçoit un signal avant le secondairement de réception (2), le mobile se déplace dans un sens allant du premier élément d'émission (1) vers le second élément d'émission (4). Si le second élément de réception (2) reçoit un signal avant le premier élément de réception (3), le mobile se déplace dans un sens allant du second élément d'émission (4) vers le premier élément d'émission (1).The signals received on the reception elements (2 and 3) make it possible to know the presence and the direction of passage of the mobile. If the first receiving element (3) receives a signal before the secondarily receiving (2), the mobile moves in a direction from the first element transmission (1) to the second transmission element (4). If the second receiving element (2) receives a signal before the first receiving element (3), the mobile moves in a direction from second transmission element (4) to the first transmission element (1).

    Le dispositif selon l'invention permet la détection des mobiles coupant le faisceau émis par le premier émetteur (1) sur une zone comprise entre une distance minimale (12) et une distance maximale (14). Il permet la détection des mobiles coupant le faisceau émis par le second émetteur infrarouge (4) sur une zone comprise entre une distance minimale (13) et une distance maximale (15). Les distances maximale (14) et minimale (12) sont déterminées par la focale (16) de l'optique de réception (6), la taille de la surface sensible du premier élément de réception (3), la distance (9) entre le premier élément de réception (3) et l'axe de l'optique de réception (6), l'entraxe de l'optique d'émission (5) et de l'optique de réception (6). Les distances maximale (15) et minimale (13) sont déterminées par la focale (16) de l'optique de réception (6), la taille de la surface sensible du premier élément de réception (2), la distance (8) entre le second élément de réception (2) et l'axe de l'optique de réception (6), l'entraxe de l'optique d'émission (7) et de l'optique de réception (6). The device according to the invention allows the detection of mobiles cutting the beam emitted by the first transmitter (1) over an area between a minimum distance (12) and a maximum distance (14). It allows the detection of mobiles cutting the beam emitted by the second infrared emitter (4) over an area between a minimum distance (13) and a maximum distance (15). The maximum (14) and minimum (12) distances are determined by the focal length (16) of the reception optics (6) , the size of the sensitive surface of the first reception element (3), the distance (9) between the first reception element (3) and the axis of the reception optics (6), the distance between the transmission optics (5) and the reception optics (6). The maximum (15) and minimum (13) distances are determined by the focal length (16) of the reception optics (6), the size of the sensitive surface of the first reception element (2), the distance (8) between the second reception element (2) and the axis of the reception optics (6), the distance between the transmission optics (7) and the reception optics (6).

    En référence à la figure 3, les éléments d'émission (1 et 4) sont pilotés par des impulsions fournies par une horloge (17). Les signaux lumineux pulsés reçus par les éléments de réception (2 et 3) sont amplifiés au moyen d'un amplificateur (18). Après amplification, les signaux reçus sont bloqués de façon synchrone à l'horloge d'émission au moyen d'un échantillonneur bloqueur (19), pour pouvoir être comparés à une tension de référence dans un comparateur (20). Le résultat de cette comparaison donne le signal de sortie 1 et le signal de sortie 2.Referring to Figure 3, the transmission elements (1 and 4) are driven by pulses supplied by a clock (17). The pulsed light signals received by the receiving elements (2 and 3) are amplified by means of an amplifier (18). After amplification, the received signals are blocked synchronously to the transmission clock by means of a blocking sampler (19), to be able to be compared to a reference voltage in a comparator (20). The result of this comparison gives the output signal 1 and the output signal 2.

    La figure 4 représente les chronogrammes des signaux de sortie (sortie 1 et sortie 2) pour un mobile passant dans le sens premier élément d'émission (1) vers deuxième élément d'émission (2). Des signaux en forme de créneau apparaissent au moment où les éléments de réception ne reçoivent plus de signal.Figure 4 shows the timing diagrams of the output signals (output 1 and output 2) for a mobile passing in the direction of first transmission element (1) towards second transmission element (2). Niche-shaped signals appear when the receiving elements are not receive more signal.

    La figure 5 représente les chronogrammes des signaux de sortie (sortie 1 et sortie 2) pour un mobile passant dans le sens deuxième élément d'émission (2) vers premier élément d'émission (1). Des signaux en forme de créneau apparaissent au moment où les éléments de réception ne reçoivent plus de signal.FIG. 5 represents the timing diagrams of the output signals (output 1 and output 2) for a mobile passing in the direction of second transmission element (2) towards first transmission element (1). Niche-shaped signals appear when the receiving elements are not receive more signal.

    Ces chronogrammes permettent de déterminer le sens de passage des mobiles, en effectuant un traitement à l'aide d'un graphe d'état.These chronograms make it possible to determine the direction of passage of the mobiles, by performing processing using a state graph.

    Selon une variante non représentée, le dispositif peut être doté de 2 optiques de réceptions, chacune étant associée à un élément de réception (2 et 3).According to a variant not shown, the device can be provided with 2 reception optics, each being associated with a receiving element (2 and 3).

    Les principales applications industrielles du dispositif sont notamment la détection et la détermination du sens de passage de mobiles se déplaçant seuls ou en groupe et dans divers lieux en vue du comptage. Par exemple, il s'agit du comptage de personnes entrant et sortant d'un moyen de transport de personnes (métro, bus, train...) ou d'un lieu public ou privé, comptage notamment d'objets passant sur un tapis roulant, comptage de véhicules...The main industrial applications of the device are in particular the detection and determination of the direction of passage of mobiles moving alone or in a group and in various places for counting. For example, this is the count of people entering and leaving a means of transport for people (metro, bus, train ...) or a public or private place, metering in particular of objects passing on a conveyor belt, counting of vehicles ...

    Plusieurs dispositifs selon l'invention peuvent être associés pour détecter et déterminer le sens de passage de mobiles se déplaçant de front, en vue du comptage (cas de personnes se déplaçant dans un couloir de métro par exemple). Le nombre de dispositifs à employer dépend de la taille, de la forme et du type de mobiles à détecter. Les dispositifs employés de la manière décrite ci-dessus doivent être synchronisés de telle sorte qu'il n'y ait pas de parasitage optique. La disposition des dispositifs décrite ci-dessus permet un traitement plus poussé des informations fournies en sortie des dispositifs. Les traitements peuvent être les suivants :

  • redondance : les signaux fournis par des dispositifs voisins peuvent être comparés pour obtenir une information fiable.
  • analyse : les signaux fournis par les dispositifs peuvent être analysés pour détecter la présence et déterminer le sens de passage de mobiles se déplaçant selon un axe mal défini (cas de piétons dans un couloir de métro par exemple).
    • Several devices according to the invention can be combined to detect and determine the direction of passage of mobiles moving head-on, for the purpose of counting (in the case of people moving in a metro corridor for example). The number of devices to be used depends on the size, shape and type of mobile to be detected. The devices used as described above must be synchronized so that there is no optical interference. The arrangement of the devices described above allows further processing of the information supplied at the output of the devices. The treatments can be as follows:
  • redundancy: the signals supplied by neighboring devices can be compared to obtain reliable information.
  • analysis: the signals provided by the devices can be analyzed to detect the presence and determine the direction of passage of mobiles moving along an ill-defined axis (case of pedestrians in a metro corridor for example).

    • Claims (5)

    1. Device for detecting the presence of mobiles and the direction of passage of mobiles with a view to counting, comprising two infrared emitters (1, 4) each having the function of emitting a beam in the direction of a mobile, and two infrared reception elements (2, 3), the two emitters (1, 4) and the two reception elements (2, 3) being designed to generate, in the direction of passage of the mobiles, two spatial detection zones in order to determine the direction of passage of the mobiles, characterised in that it has a unit comprising the two emitters (1, 4), the two reception elements (2, 3), optical emission means (5, 7) focusing the light emitted by the emitters (1, 4), optical reception means (6) collecting and focusing the beam reflected by a mobile passing through a detection zone, and electronics for driving the emission elements (1,4) and for processing the signals received by the reception elements (2, 3), in that the two reception elements (2, 3) are arranged at a distance from the optical axis of the optical reception means (6), in that the optical axis of the optical reception means (6) is parallel to the optical axes of the optical emission means, which are mutually parallel, in that the reception elements (2, 3) are infrared diodes oriented perpendicularly to the optical axes of the optical emission means (5, 7), and in that the arrangement of the emission and reception systems is in accordance with the following relationships: x1 = f dmin1 . D1 x1 + t = f dmax1 . D1 x2 = f dmin2 . D2 x2 + t = f dmax2 . D2 with:
      t: the size of the reception elements (2 and 3)
      d min 1: the minimum detection distance (12) of the first emitter (1) and of the first reception element (3)
      d max 1: maximum detection distance (14) of the first emitter (1) and of the first reception element (3)
      d min 2: minimum detection distance (13) of the second emitter (4) and of the second reception element (2)
      d max 2: maximum detection distance (15) of the second emitter (4) and of the second reception element (2)
      D1: the axial offset between the first optical emission means (5) and the optical reception means (6)
      D2: the axial offset between the second optical emission means (7) and the optical reception means (6)
      f: the focal length (16) of the optical reception means (6)
      x1: the distance (9) between the first reception element (3) and the axis of the optical reception means (6)
      x2: the distance (8) between the second reception element (2) and the axis of the optical reception means (6).
    2. Device according to Claim 1, characterised in that the reception elements (2, 3) are located in the same plane.
    3. Device according to Claim 2, characterised in that the emitters (1, 4) and the reception elements (2, 3) are located in the same plane, which is perpendicular to the optical axes of the optical emission means (5, 7).
    4. Device according to one of Claims 1 to 3, characterised in that it comprises a reception lens (6), through which the reflected beams (10, 11) emitted by the two emitters (1, 4) pass.
    5. Device according to any one of the preceding claims, characterised in that the electronics for driving each emission element and for processing the signals received by each reception element have a clock (17) which generates pulses driving each emitter, an amplifier (18) amplifying the light signals generated by each reception element, and a sample-and-hold circuit (19) which is synchronised with the said clock in order to hold the amplified signals and compare them with a reference voltage by means of a comparator (20).
    EP95942739A 1994-06-08 1995-12-14 Device for detecting the presence and direction of passage of mobiles and persons with the view to counting them Expired - Lifetime EP0867018B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9406962A FR2721126A1 (en) 1994-06-08 1994-06-08 Detector for presence and sense of motion for counting people or objects
    PCT/FR1995/001473 WO1997022089A1 (en) 1994-06-08 1995-12-14 Device for detecting the presence and direction of passage of mobiles and persons with the view to counting them

    Publications (2)

    Publication Number Publication Date
    EP0867018A1 EP0867018A1 (en) 1998-09-30
    EP0867018B1 true EP0867018B1 (en) 2002-03-20

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    EP (1) EP0867018B1 (en)
    DE (1) DE69525981T2 (en)
    ES (1) ES2173212T3 (en)
    FR (1) FR2721126A1 (en)
    PT (1) PT867018E (en)
    WO (1) WO1997022089A1 (en)

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    Also Published As

    Publication number Publication date
    DE69525981D1 (en) 2002-04-25
    WO1997022089A1 (en) 1997-06-19
    FR2721126A1 (en) 1995-12-15
    EP0867018A1 (en) 1998-09-30
    PT867018E (en) 2002-08-30
    ES2173212T3 (en) 2002-10-16
    DE69525981T2 (en) 2002-11-21
    FR2721126B1 (en) 1997-02-28

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