EP2137549A2 - Method and single laser device for detecting magnifying optical systems - Google Patents

Method and single laser device for detecting magnifying optical systems

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Publication number
EP2137549A2
EP2137549A2 EP08787922A EP08787922A EP2137549A2 EP 2137549 A2 EP2137549 A2 EP 2137549A2 EP 08787922 A EP08787922 A EP 08787922A EP 08787922 A EP08787922 A EP 08787922A EP 2137549 A2 EP2137549 A2 EP 2137549A2
Authority
EP
European Patent Office
Prior art keywords
scene
detector
image
laser
illuminated
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Withdrawn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
EP08787922A
Other languages
German (de)
French (fr)
Inventor
Jean-Louis Duvent
Jean-Yves Thomas
Pierre Morin
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.)
Compagnie Industriel des Lasers CILAS SA
Original Assignee
Compagnie Industriel des Lasers CILAS 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
Application filed by Compagnie Industriel des Lasers CILAS SA filed Critical Compagnie Industriel des Lasers CILAS SA
Publication of EP2137549A2 publication Critical patent/EP2137549A2/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/495—Counter-measures or counter-counter-measures using electronic or electro-optical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41G—WEAPON SIGHTS; AIMING
    • F41G1/00—Sighting devices
    • F41G1/32—Night sights, e.g. luminescent
    • F41G1/34—Night sights, e.g. luminescent combined with light source, e.g. spot light
    • F41G1/35—Night sights, e.g. luminescent combined with light source, e.g. spot light for illuminating the target, e.g. flash lights
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/04—Systems determining the presence of a target
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/486—Receivers
    • G01S7/487—Extracting wanted echo signals, e.g. pulse detection

Definitions

  • the present invention relates to a method and a device for the detection of magnifying optical systems.
  • magnifying optical systems such as riflescopes and eyes
  • retroreflective objects such as retro-reflectors of motor vehicles, indicating signs, etc.
  • the light spots shown by the images do not necessarily correspond to magnifying optical systems and therefore there is ambiguity as to the detection of the latter.
  • the present invention aims to overcome this disadvantage.
  • the method for the detection of a magnifying optical system being in a scene with other objects capable of retroreflecting light the method according to which the said scene is illuminated by at least one pulse laser emitted by a laser transmitter and taking a first image of said scene illuminated by said laser pulse by means of a first detector observing said scene, said first detector and said laser transmitter being at least approximately transversely adjacent to the direction of said scene, is remarkable in that: said scene is observed by at least one second detector spaced apart from said laser transmitter transversely to the direction of said scene;
  • one of said objects is considered to be a magnifying optical system if its image is present in said first image of said scene, but absent from said second image of said scene.
  • the applicant has observed that the retroreflective cone of a magnifying optical system is very narrow (of the order of 0.1 mrad), whereas that of the usual reflex reflectors is much wider (at least equal to 50 mrad). ).
  • said second detector will be able to receive the emitted retro-reflected light from the conventional retro-reflectors, but will not see the light retroreflected by a magnifying optical system.
  • the transverse difference between the second detector and said transmitter to benefit from the invention depends on the distance separating the second detector and said magnifying optical system, as well as the angle of the retroreflective cone thereof.
  • a fixed transversal difference of at least 200 mm, preferably of the order of 400 mm makes it possible to discriminate an optical system from a conventional retro-reflector for distances of between a few meters and several meters. kilometers.
  • the present invention further relates to a device for detecting a magnifying optical system in a scene with other objects capable of retroreflecting light, said device comprising a laser transmitter for illuminating said jet scene with a first detector capable of detecting the light retroreflected by said objects illuminated by said emitter, said first detector and said laser emitter being at least approximately transverse to the direction of said scene, the detection device being remarkable in that it comprises:
  • a second detector spaced apart from said laser emitter transversely to the direction of said scene and able to detect the light retroreflected by said objects illuminated by said laser emitter;
  • Figure 1 schematically illustrates the present invention in the case of a magnifying optical system.
  • Figure 2 schematically illustrates the present invention in the case of a conventional retro-reflector.
  • a device comprising a first and a second detectors D1 and D2, for example of the CCD matrix type, and a pulsed laser emitter E.
  • the laser emitter E and the first detector D1 are very close to each other and can even form a single physical unit. They are oriented in a direction towards a scene which is distant from the distance L and in which there is an object OP or OR able to retroreflect the light.
  • the second detector D2 is located, transversely to the direction d, of a deviation x with respect to the laser emitter E.
  • the Bngle of the emission cone of the laser emitter E is designated by e.
  • the retroreflective object OP shown in FIG. 1, is a magnifying optical system, such as an eye, a telescope, etc. Consequently, its retroreflection cone is narrow, with an angle r, for example order of 0.1 mrad.
  • the light emitted by the emitter E adjacent to the first detector D1 and retroreflected by the magnifying optical system OP into such a narrow retroreflection cone can be received by said first detector D1.
  • this light emitted by said emitter E and retroreflected by the magnifying optical system OP can not be received by said second detector D2, separated from the emitter E.
  • the retroreflective object is a magnifying optical system OP
  • the second detector D2 can not receive the light emitted by the emitter E spaced and retroreflected by the magnifying optical system OP.
  • the retroreflective object is a conventional retro-reflector OR
  • the retroreflective cone of the latter is wide, with an angle R, for example at least equal to 50 mrad.
  • the light emitted by the emitter E and retroreflected by the object OR is received, both simultaneously by said first and second detectors.
  • the laser emission of the emitter E can be constituted by a train of laser pulses.
  • the detectors D1 and D2 are able to form first and second images of the scene in which the retroreflective objects OP and OR are located in synchronism with said laser pulses, respectively.
  • both said first images and said second images respectively formed by the detectors D1 and D2 comprise the image of the object OR illuminated by said laser pulses, respectively;
  • the retroreflective object is a magnifying optical system OP
  • only said first images formed by said first detector D1 comprise the image of the object OP illuminated by said first laser pulses, said second images formed by said second detector; D2 can not include the image of the OP object illuminated by said laser pulses.
  • the latter is a conventional retro-reflector

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Measurement Of Optical Distance (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention comprises illuminating a scene where said magnifying optical system (OP) may occur with at least one pulse generated by first laser transmitter (E). The laser transmitter (E) and a first detector of the scene thus illuminated (D1) are adjacent, while a second detector (D2) is remote from said transmitter (E) transversally to the direction (d) of said scene.

Description

Procédé et dispositif à un laser pour la détection de systèmes optiques grossissants. Laser method and device for detecting magnifying optical systems
La présente invention concerne un procédé et un dispositif pour la détection de systèmes optiques grossissants.The present invention relates to a method and a device for the detection of magnifying optical systems.
On sait que les systèmes optiques grossissants (tels que les lunettes de visée et les yeux) présentent la propriété de rétroréfléchir la Iu- mière. Aussi, pour détecter un tel système optique grossissant se trouvant dans une scène, il est connu d'éclairer ladite scène par des impulsions laser et d'en prendre des images en synchronisme avec les éclairements laser correspondants. Ainsi, sur lesdites images apparaît une tache lumineuse correspondant audit système optique grossissant. Cependant, dans ladite scène ainsi éclairée, peuvent se trouver d'autres objets rétroréfléchissants, tels que des catadioptres de véhicules automobiles, des panneaux indicateurs, etc ... Il en résulte que les taches lumineuses montrées par les images ne correspondent pas obligatoirement à des systèmes optiques grossissants et qu'il existe donc une ambiguïté quant à la détection de ces derniers.It is known that magnifying optical systems (such as riflescopes and eyes) have the property of retroreflecting the light. Also, to detect such a magnifying optical system in a scene, it is known to illuminate said scene by laser pulses and to take images in synchronism with the corresponding laser illumination. Thus, on said images appears a bright spot corresponding to said magnifying optical system. However, in said scene thus illuminated, there may be other retroreflective objects, such as retro-reflectors of motor vehicles, indicating signs, etc. It follows that the light spots shown by the images do not necessarily correspond to magnifying optical systems and therefore there is ambiguity as to the detection of the latter.
La présente invention a pour objet de remédier à cet inconvénient. A cette fin, selon l'invention, le procédé pour la détection d'un système optique grossissant se trouvant dans une scène avec d'autres objets aptes à rétroréfléchir la lumière, procédé selon lequel on éclaire Ia- dite scène par au moins une impulsion laser émise par un émetteur laser et on procède à la prise d'une première image de ladite scène éclairée par ladite impulsion laser au moyen d'un premier détecteur observant ladite scène, ledit premier détecteur et ledit émetteur laser étant au moins approximativement adjacents transversalement à la direction de ladite scène, est remarquable en ce que : - on observe ladite scène par au moins un second détecteur écarté dudit émetteur laser transversalement à la direction de ladite scène ;The present invention aims to overcome this disadvantage. To this end, according to the invention, the method for the detection of a magnifying optical system being in a scene with other objects capable of retroreflecting light, the method according to which the said scene is illuminated by at least one pulse laser emitted by a laser transmitter and taking a first image of said scene illuminated by said laser pulse by means of a first detector observing said scene, said first detector and said laser transmitter being at least approximately transversely adjacent to the direction of said scene, is remarkable in that: said scene is observed by at least one second detector spaced apart from said laser transmitter transversely to the direction of said scene;
- au moyen dudit second détecteur, on procède à la prise d'au moins une seconde image de ladite scène éclairée par ladite impulsion laser ; - on compare lesdites première et seconde Images simultanées ; etby means of said second detector, at least one second image of said scene illuminated by said laser pulse is taken; comparing said first and second simultaneous images; and
- on considère que l'un desdits objets est un système optique grossissant si son image est présente dans ladite première image de ladite scène, mais absente de ladite seconde image de ladite scène.one of said objects is considered to be a magnifying optical system if its image is present in said first image of said scene, but absent from said second image of said scene.
En effet, la demanderesse a observé que le cône de rétroréflexion d'un système optique grossissant est très étroit (de l'ordre de 0,1 mrad), alors que celui des catadioptres usuels est beaucoup plus large (au moins égal à 50 mrad). Ainsi, en écartant ledit second détecteur de l'émetteur, ledit second détecteur pourra recevoir la lumière émise rétro réfléchie par les catadioptres usuels, mais ne verra pas la lumière rétroréfléchie par un système optique grossissant.Indeed, the applicant has observed that the retroreflective cone of a magnifying optical system is very narrow (of the order of 0.1 mrad), whereas that of the usual reflex reflectors is much wider (at least equal to 50 mrad). ). Thus, by discarding said second detector from the transmitter, said second detector will be able to receive the emitted retro-reflected light from the conventional retro-reflectors, but will not see the light retroreflected by a magnifying optical system.
Bien entendu, l'écart transversal entre le second détecteur et ledit émetteur permettant de bénéficier de l'invention dépend de la distance séparant le second détecteur et ledit système optique grossissant, ainsi que de l'angle du cône de rétroréflexion de celui-ci. Toutefois, l'expérience a montré qu'un écart transversal fixe au moins égal à 200 mm, de préférence de l'ordre de 400 mm, permettait de discriminer un système optique d'un catadioptre usuel pour des distances comprises entre quelques mètres et plusieurs kilomètres.Of course, the transverse difference between the second detector and said transmitter to benefit from the invention depends on the distance separating the second detector and said magnifying optical system, as well as the angle of the retroreflective cone thereof. However, experience has shown that a fixed transversal difference of at least 200 mm, preferably of the order of 400 mm, makes it possible to discriminate an optical system from a conventional retro-reflector for distances of between a few meters and several meters. kilometers.
Il est avantageux d'éclairer ladite scène au moyen d'une suite d'impulsions laser émises par ledit émetteur laser, de procéder aux prises de couples d'images successifs comprenant chacun une première image et une seconde image simultanées correspondant à chaque impulsion laser de la suite et de comparer successivement la première image et la seconde image de chaque couple d'images. La présente invention concerne de plus un dispositif pour la détection d'un système optique grossissant se trouvant dans une scène avec d'autres objets aptes à rétroréfléchir Ja lumière, ledit dispositif comportant un émetteur laser pour éclairer ladite scène jet un premier détecteur apte à détecter la lumière rétroréfléchie par lesdits objets éclairés par ledit émetteur, ledit premier détecteur et ledit émetteur laser étant au moins approximativement adjacents transversalement à la direction de ladite scène, le dispositif de détection étant remarquable en ce qu'il comporte :It is advantageous to illuminate said scene by means of a series of laser pulses emitted by said laser transmitter, to take successive image pairs each comprising a first image and a second simultaneous image corresponding to each laser pulse of following and compare successively the first image and the second image of each pair of images. The present invention further relates to a device for detecting a magnifying optical system in a scene with other objects capable of retroreflecting light, said device comprising a laser transmitter for illuminating said jet scene with a first detector capable of detecting the light retroreflected by said objects illuminated by said emitter, said first detector and said laser emitter being at least approximately transverse to the direction of said scene, the detection device being remarkable in that it comprises:
- un second détecteur écarté dudit émetteur laser transversalement à la direction de ladite scène et apte à détecter la lumière rétroréfléchie par lesdits objets éclairés par ledit émetteur laser ; eta second detector spaced apart from said laser emitter transversely to the direction of said scene and able to detect the light retroreflected by said objects illuminated by said laser emitter; and
- un comparateur apte à comparer les images simultanées de ladite scène éclairée par ledit émetteur laser, prises respectivement par lesdits premier et second détecteurs. Les figures du dessin annexé feront bien comprendre comment l'invention peut être réalisée. Sur ces figures, des références identiques désignent des éléments semblables.a comparator able to compare the simultaneous images of said scene illuminated by said laser transmitter, taken respectively by said first and second detectors. The figures of the appended drawing will make it clear how the invention can be realized. In these figures, identical references designate similar elements.
La figure 1 illustre schématiquement la présente invention dans le cas d'un système optique grossissant. La figure 2 illustre schématiquement la présente invention dans le cas d'un catadioptre usuel.Figure 1 schematically illustrates the present invention in the case of a magnifying optical system. Figure 2 schematically illustrates the present invention in the case of a conventional retro-reflector.
Sur ces figures, on a représenté un dispositif conforme à la présente invention comportant un premier et un second détecteurs D1 et D2, par exemple du type à matrice CCD, et un émetteur laser impulsionnel E. L'émetteur laser E et le premier détecteur D1 sont très proches l'un de l'autre et peuvent même former une seule unité physique. Ils sont orientés selon une direction d, vers une scène qui est distante de la distance L et dans laquelle se trouve un objet OP ou OR apte à rétroréfléchir la lumière. En revanche, le second détecteur D2 se trouve distant, transversalement à la direction d, d'un écart x par rapport à l'émetteur laser E.In these figures, there is shown a device according to the present invention comprising a first and a second detectors D1 and D2, for example of the CCD matrix type, and a pulsed laser emitter E. The laser emitter E and the first detector D1 are very close to each other and can even form a single physical unit. They are oriented in a direction towards a scene which is distant from the distance L and in which there is an object OP or OR able to retroreflect the light. On the other hand, the second detector D2 is located, transversely to the direction d, of a deviation x with respect to the laser emitter E.
Sur les figures T et 2, on -a- désigné l'Bngle du cône d'émission de l'émetteur laser E par e. L'objet rétroréfléchissant OP, montré sur la figure 1 , est un système optique grossissant, comme un œil, une lunette de visée, etc ... Par suite, son cône de rétroréflexion est étroit, avec un angle r, par exemple de l'ordre de 0, 1 mrad. Il en résulte, comme représenté sur la figure 1 , que la lumière émise par l'émetteur E adjacent au premier détecteur D1 et rétroréfléchie par le système optique grossissant OP dans un tel cône de rétroréflexion étroit peut être reçu par ledit premier détecteur D1 . En revanche, cette lumière émise par ledit émetteur E et rétroréfléchie par le système optique grossissant OP ne peut être reçue par ledit second détecteur D2, écarté de l'émetteur E. Ainsi, lorsque l'objet rétroréfléchissant est un système optique grossissant OP, le second détecteur D2 ne peut recevoir la lumière émise par l'émetteur E écarté et rétroréfléchie par le système optique grossissant OP.In FIGS. T and 2, the Bngle of the emission cone of the laser emitter E is designated by e. The retroreflective object OP, shown in FIG. 1, is a magnifying optical system, such as an eye, a telescope, etc. Consequently, its retroreflection cone is narrow, with an angle r, for example order of 0.1 mrad. As a result, as shown in FIG. 1, the light emitted by the emitter E adjacent to the first detector D1 and retroreflected by the magnifying optical system OP into such a narrow retroreflection cone can be received by said first detector D1. On the other hand, this light emitted by said emitter E and retroreflected by the magnifying optical system OP can not be received by said second detector D2, separated from the emitter E. Thus, when the retroreflective object is a magnifying optical system OP, the second detector D2 can not receive the light emitted by the emitter E spaced and retroreflected by the magnifying optical system OP.
Lorsque, comme cela est représenté sur la figure 2, l'objet rétroré- fléchissant est un catadioptre usuel OR, le cône de rétroréflexion de ce dernier est large, avec un angle R, par exemple au moins égal à 50 mrad.When, as shown in FIG. 2, the retroreflective object is a conventional retro-reflector OR, the retroreflective cone of the latter is wide, with an angle R, for example at least equal to 50 mrad.
Il en résulte que la lumière émise par l'émetteur E et rétroréfléchie par l'objet OR est reçue, à la fois et simultanément par lesdits premier et second détecteurs. L'émission laser de l'émetteur E peut être constituée par un train d'impulsions laser. Quant à eux, les détecteurs D1 et D2 sont aptes à former des premières et des secondes images de la scène dans laquelle se trouvent les objets rétroréfléchissants OP et OR en synchronisme avec lesdites impulsions laser, respectivement. De ce qui précède, on déduit donc que :As a result, the light emitted by the emitter E and retroreflected by the object OR is received, both simultaneously by said first and second detectors. The laser emission of the emitter E can be constituted by a train of laser pulses. As for them, the detectors D1 and D2 are able to form first and second images of the scene in which the retroreflective objects OP and OR are located in synchronism with said laser pulses, respectively. From the above, we deduce that:
- dans le cas où l'objet rétroréfléchissant est un catadioptre usuel OR, aussi bien lesdites premières images que lesdites secondes images formées respectivement par les détecteurs D1 et D2 comportent l'image de l'objet OR éclairé par lesdites impulsions laser, respectivement ; etin the case where the retroreflective object is a conventional retro-reflector OR, both said first images and said second images respectively formed by the detectors D1 and D2 comprise the image of the object OR illuminated by said laser pulses, respectively; and
- dans le cas où i'objet rétroréfléchissant est un système optique grossissant OP, seules lesdites premières images formées par ledit premier détecteur D1 comportent l'image de l'objet OP éclairé par lesdites premières impulsions laser, lesdites secondes images formées par ledit second détecteur D2 ne pouvant comporter l'image de l'objet OP éclairé par lesdites impulsions laser.in the case where the retroreflective object is a magnifying optical system OP, only said first images formed by said first detector D1 comprise the image of the object OP illuminated by said first laser pulses, said second images formed by said second detector; D2 can not include the image of the OP object illuminated by said laser pulses.
Il résulte de ce qui précède que la comparaison, réalisée dans un comparateur C, d'une première et d'une seconde images simultanées formées respectivement par lesdits premier et second détecteurs D1 et D2 et correspondant à une même impulsion laser, permet de considérer que :It follows from the above that the comparison, made in a comparator C, of a first and a second simultaneous image formed respectively by said first and second detectors D1 and D2 and corresponding to the same laser pulse, makes it possible to consider that :
- si la première image et la seconde image comportent toutes les deux l'image de l'objet rétroréfléchissant, celui-ci est un catadioptre usuel ; etif the first image and the second image both have the image of the retroreflective object, the latter is a conventional retro-reflector; and
- si seule la première image comporte l'image de l'objet rétroréfléchis- sant, celui-ci est un système optique grossissant.if only the first image contains the image of the retroreflective object, this is a magnifying optical system.
L'expérience a montré que ce qui précède était vérifié lorsque l'écart transversal x entre l'émetteur E et le second détecteur D2 était au moins égal à 200 mm et, de préférence, de l'ordre de 400 mm. Experience has shown that the foregoing was verified when the transverse deviation x between the emitter E and the second detector D2 was at least 200 mm and, preferably, of the order of 400 mm.

Claims

REVENDICATIONS
1 . Procédé pour la détection d'un système optique grossissant (OP) se trouvant dans une scène avec d'autres objets (OR) aptes à rétroré- fiéchJr !a lumière, procédé selon lequel on éclaire ladite scène par au moins une impulsion laser émise par un émetteur laser (E) et on procède à la prise d'une première image de ladite scène éclairée par ladite impulsion laser au moyen d'un premier détecteur (D 1 ) observant ladite scène, ledit premier détecteur (DD et ledit émetteur laser (E) étant au moins approximativement adjacents transversalement à la direction (d) de ladite scène, caractérisé en ce que :1. A method for detecting a magnifying optical system (OP) located in a scene with other objects (OR) capable of retroreflecting with light, wherein said scene is illuminated by at least one laser pulse emitted by a laser transmitter (E) and taking a first image of said scene illuminated by said laser pulse by means of a first detector (D 1) observing said scene, said first detector (DD and said laser transmitter ( E) being at least approximately transverse to the direction (d) of said scene, characterized in that:
- on observe ladite scène par au moins un second détecteur (D2) écarté dudit émetteur laser (E) transversalement à la direction (d) de ladite scène ;said scene is observed by at least a second detector (D2) spaced from said laser emitter (E) transversely to the direction (d) of said scene;
- au moyen dudit second détecteur (D2), on procède à la prise d'au moins une seconde image de ladite scène éclairée par ladite impulsion laser ;by means of said second detector (D2), at least one second image of said scene illuminated by said laser pulse is taken;
- on compare lesdites première et seconde images simultanées ; etcomparing said first and second simultaneous images; and
- on considère que l'un desdits objets est un système optique grossissant (OP) si son image est présente dans ladite première image de ladite scène, mais absente de ladite seconde image de ladite scène.one of said objects is considered to be a magnifying optical system (OP) if its image is present in said first image of said scene, but absent from said second image of said scene.
2. Procédé selon la revendication 1 , caractérisé en ce que l'écart transversal (x) entre ledit second détecteur (D2) et ledit émetteur laser (E) est au moins égal à 200 mm.2. Method according to claim 1, characterized in that the transverse difference (x) between said second detector (D2) and said laser emitter (E) is at least 200 mm.
3. Procédé selon la revendication 2, caractérisé en ce que ledit écart transversal (x) est de l'ordre de 400 mm.3. Method according to claim 2, characterized in that said transverse deviation (x) is of the order of 400 mm.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on éclaire ladite scène au moyen d'une suite d'impulsions laser émises par ledit émetteur laser (E), en ce qu'on procède aux prises de couples d'images successifs comprenant chacun une première image et une seconde image simultanées correspondant à chaque impulsion laser de la suite et en ce qu'on compare successivement la première image et la seconde image de chaque couple d'images.4. Method according to one of claims 1 to 3, characterized in that said scene is illuminated by means of a series of laser pulses emitted by said laser emitter (E), in that one proceeds to pairs of successive images each comprising a first image and a second simultaneous image corresponding to each laser pulse of the sequence and in that successively comparing the first image and the second image of each pair of images.
5. Dispositif pour la détection d'un système optique grossissant {OP) se trouvant dans une scène avec d'autres objets (OR) aptes à rétroré- fléchir la lumière, ledit dispositif comportant un émetteur laser (E) pour éclairer ladite scène et un premier détecteur (D1 ) apte à détecter la lumière rétroréfléchie par lesdits objets éclairés par ledit émetteur (E), ledit premier détecteur (D 1 ) et ledit émetteur laser (E) étant au moins approxi- mativement adjacents transversalement à la direction (d) de ladite scène, caractérisé en ce qu'il comporte :5. A device for detecting a magnifying optical system (OP) in a scene with other objects (OR) capable of retroreflecting light, said device comprising a laser emitter (E) for illuminating said scene and a first detector (D1) adapted to detect the light retroreflected by said objects illuminated by said emitter (E), said first detector (D 1) and said laser emitter (E) being at least approximately transverse to the direction (d) ) of said scene, characterized in that it comprises:
- un second détecteur (D2) écarté dudit émetteur laser (E) transversalement à la direction (d) de ladite scène et apte à détecter la lumière rétroréfléchie par lesdits objets éclairés par ledit émetteur ; et - un comparateur (C) apte à comparer les images simultanées de ladite scène éclairée par ledit émetteur laser (E), prises respectivement par lesdits premier et second détecteurs (D1 , D2).a second detector (D2) spaced from said laser emitter (E) transversely to the direction (d) of said scene and able to detect the light retroreflected by said objects illuminated by said emitter; and a comparator (C) capable of comparing the simultaneous images of said scene illuminated by said laser emitter (E) taken respectively by said first and second detectors (D1, D2).
6. Dispositif selon la revendication 5, caractérisé en ce que l'écart transversal (x) entre ledit second détecteur (D2) et ledit émetteur laser (E) est au moins égal à 200 mm.6. Device according to claim 5, characterized in that the transverse distance (x) between said second detector (D2) and said laser emitter (E) is at least 200 mm.
7. Dispositif selon la revendication 6, caractérisé en ce que ledit écart transversal (x) est de l'ordre de 400 mm. 7. Device according to claim 6, characterized in that said transverse deviation (x) is of the order of 400 mm.
EP08787922A 2007-04-11 2008-04-07 Method and single laser device for detecting magnifying optical systems Withdrawn EP2137549A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0702629A FR2915000B1 (en) 2007-04-11 2007-04-11 METHOD AND DEVICE FOR A LASER FOR DETECTION OF GROSSING OPTICAL SYSTEMS
PCT/FR2008/000484 WO2008142269A2 (en) 2007-04-11 2008-04-07 Method and single laser device for detecting magnifying optical systems

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EP2137549A2 true EP2137549A2 (en) 2009-12-30

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EP (1) EP2137549A2 (en)
CA (1) CA2681837A1 (en)
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IL (1) IL201266A0 (en)
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WO2008142269A3 (en) 2009-01-22
FR2915000B1 (en) 2010-08-20
FR2915000A1 (en) 2008-10-17
CA2681837A1 (en) 2008-11-27
WO2008142269A2 (en) 2008-11-27
IL201266A0 (en) 2010-05-31
US20100067744A1 (en) 2010-03-18
RU2419810C1 (en) 2011-05-27

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