EP0704085B1 - Procede et dispositif permettant de produire des images bi- ou tridimensionnelles dans des substances gazeuses - Google Patents

Procede et dispositif permettant de produire des images bi- ou tridimensionnelles dans des substances gazeuses Download PDF

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Publication number
EP0704085B1
EP0704085B1 EP94920440A EP94920440A EP0704085B1 EP 0704085 B1 EP0704085 B1 EP 0704085B1 EP 94920440 A EP94920440 A EP 94920440A EP 94920440 A EP94920440 A EP 94920440A EP 0704085 B1 EP0704085 B1 EP 0704085B1
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EP
European Patent Office
Prior art keywords
laser
image
process according
beams
laser beams
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Expired - Lifetime
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EP94920440A
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German (de)
English (en)
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EP0704085A1 (fr
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Klaus Gustav Wende
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects
    • G09F19/16—Advertising or display means not otherwise provided for using special optical effects involving the use of mirrors

Definitions

  • the invention relates to a method and a device for generating two- or three-dimensional images in gaseous media, in particular in the earth's atmosphere.
  • DE-A-41 28 949 discloses a method for the spatial representation of images, in which a medium is used in which particles of a luminescent substance are distributed. Two bundles of rays are superimposed in the medium in such a way that the luminescent particles are activated at their intersections and brought to light emission.
  • the invention is based on the fact that nitrogen and oxygen molecules can be ionized in very large electrical fields (field ionization) and that when an electron is recombined or recaptured, energy is released which is then visible to the molecule in question as light radiation (flash of light) Spectral range is given. If such lighting phenomena are caused at given points, for example a two-dimensional or three-dimensional matrix, a two- or three-dimensional image can be produced. A point of light that is repeated at approx. 25 Hz appears to the viewer as standing. The human eye has a resolution of about 1 minute of arc. At a distance of 100 m from the image to be generated, a line can therefore be drawn if the light points generated are approximately 3 cm apart.
  • the light spots are generated by bundling one or more laser beams, which preferably emit outside or at the edge of the visible spectral range, at the intended location where the light spot is to appear.
  • Corresponding device is shown in FIG. 1.
  • One or more lasers (1) generate laser beams or beam pulses (2), the beam cross section of which is initially in one optical device (2) is fanned out or defocused, for example by means of a mirror or a lens. From the expansion mirror (3), the laser beam falls onto a focusing mirror (4), which focuses the received laser light and focuses it at a distance of 10-100 m in a narrow area, in which the field strength then becomes so high that the atmospheric therein Gases, primarily nitrogen and oxygen, are ionized.
  • the ionization is immediately followed by the laser pulse.
  • a CO 2 laser or a YAG laser is used.
  • Such a laser emits in the infrared spectral range, so that the observers cannot see the laser beam, but only the effect caused by it, ie the light flash (9) or the image composed of such light flashes (9).
  • the expansion mirror (3) shown in Fig. 1 can also be used for beam deflection, so that - analogous to the deflection of an electron beam in a black and white television picture - the focal point of the laser beam pulses scans a predetermined point matrix and at those matrix points in the Image should appear bright, flashes of light (9) generated.
  • the focusing mirrors have a diameter of 30 to 50 cm, for example.
  • Both mirrors, preferably the entire beam deflection system (3) and the laser (1), are mounted on a very heavy plate (5) in order to avoid beam deflections that could occur due to ground vibrations.
  • a very heavy plate (5) for example, air-bearing granite slabs with a weight of around 4 tons can be used to mount the mirrors.
  • mountable steel structures are conceivable.
  • the two laser beams shown in FIG. 1 do not necessarily have to be in phase at the focusing point be. The only thing that matters is that enough molecules of the atmospheric air are ionized. However, if phase correctness is achieved, an increase in the field strength at the focusing point is to be expected, so that the light yield increases.
  • the optical device (3) with which the laser beam is deflected so that its focal point scans the rows and columns of the intended image, can be equipped with piezo elements. These piezo elements move the deflection mirror and thus achieve beam deflection. So-called scanners are also possible, e.g. rotating mirrors with electrical coil arrangements, as well as so-called Bragg reflectors.
  • the spatial depth, i.e. the third dimension can be achieved by changing the focal length of the optical device (zoom).
  • the laser beam is sent to individual parallel amplifiers in each case after preamplification via a mirror system.
  • the 10 individual laser beams are directed onto the common focus lens via separate deflection systems and focused at the intended pixels, for example, at a distance of about 100 m from the focus lenses. Since the repetition frequency of the laser pulses can be 5 kHz, 50,000 light points per second can be generated with this system. This is sufficient, for example, to produce a neon sign floating in free space.
  • the components of the deflection device are shown schematically in FIG. 2.
  • the entire control is synchronized to the laser beam source (1).
  • electrical signals are derived from the laser pulses with a trigger pulse generator (8), which are used in the computer control (6) for triggering the deflection device.
  • the position data available in a storage unit are called up in the computer control (6) and processed into signals which are fed to the optical device (3), which then independently sets the positioning units for the deflection mirrors.
  • the next position data is provided by the storage unit during the setting time. After the time available for the entire process, which is less than 200 ms, the setting of the positioning units (7) is completed and the next light pulse is emitted by the synchronization source, which now generates the first image and at the same time acts as a trigger for the setting of the next positioning process.
  • a phototransistor can be used in the trigger pulse generator, the input signal of which is converted into a digital signal in an AD converter.
  • a standard office computer with a RAM memory capacity of more than 40MB can be used as the storage unit, for example.
  • the required position data for the pixels to be generated are stored in this memory.
  • One byte contains the information for a positioning unit.
  • the ready data are transmitted to the positioning units (7) on the basis of the trigger signal. After the data has been transferred, the edge position data are provided.
  • Each positioning unit (7) consists of a separate electrical control and a mechanical part.
  • the mechanical part can consist of a rotary magnet, for example, which is set to the 16 possible positions by fixed resistors.
  • a servomotor stepper motor

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

L'invention concerne un procédé permettant de produire des inscriptions lumineuses ou des images bi- ou tridimensionnelles flottant librement dans l'air. A cet effet, des faisceaux laser dont la fréquence d'émission se situe de préférence en dehors du domaine spectral visible sont focalisés à des endroits de chacun des points d'image clairs à produire, de manière à déclencher des éclairs lumineux dans l'atmosphère, générés par exemple par ionisation de champ des molécules d'air et par recombinaison ultérieure. Le point de focalisation des faisceaux laser est déplacé progressivement en lignes et en colonnes de manière à produire une image constituée d'éclairs lumineux individuels, qui est répétée à une fréquence d'image supérieure à 16 Hz afin de produire une image stationnaire.

Claims (9)

  1. Procédé de production d'images bidimensionnelles ou tridimensionnelles autolumineuses dans des fluides gazeux, en particulier dans l'atmosphère terrestre, dans lequel l'image respective est constituée d'une suite d'éclairs lumineux, qui sont déclenchés dans le fluide gazeux aux points d'image prévus pour la constitution de l'image, par ionisation des particules de gaz atmosphérique, par focalisation d'un ou de plusieurs rayons laser (2), dont la fréquence se situe à l'extérieur du domaine spectral visible.
  2. Procédé selon la revendication 1, caractérisé en ce que les points d'image sont produits par balayage du point de focalisation du rayon laser le long des lignes, des colonnes et éventuellement des rangées d'une matrice de points d'image bidimensionnelle ou tridimensionnelle.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que les différents rayons laser (2), après sortie du laser (1), sont d'abord élargis dans un dispositif optique (2) puis sont focalisés au moyen d'un miroir de focalisation sur le point d'image (9) prévu dans chaque cas.
  4. Procédé selon la revendication 3, caractérisé en ce que le dispositif optique (3) réalise en même temps la déviation des rayons laser (2), nécessaire pour le balayage de l'image.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que pour produire des images tridimensionnelles le plan de focalisation des rayons laser (2) est déplacé pas à pas.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce qu'est utilisé un laser (1) dont la succession des impulsions est supérieure à 500 Hz, en particulier environ égale à 5 kHz.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que les rayons de sortie d'un laser (1) sont envoyés par un système de miroirs à un nombre d'amplificateurs lasers fonctionnant en parallèle, et en ce que les rayons de sortie des amplificateurs lasers sont envoyés chacun par leurs propres systèmes de focalisation et de déviation sur une lentille de défocalisation commune.
  8. Dispositif pour la mise en oeuvre d'un procédé selon l'une des revendications 1 à 7, caractérisé par un ou plusieurs lasers (1), dans lesquels la fréquence de la lumière émise se situe à l'extérieur du domaine spectral visible, un dispositif à optique (2) pour la déviation des faisceaux de rayon émis par le(les) laser(s) selon les coordonnées des points lumineux à produire, et par un ou plusieurs miroirs de focalisation (4) pour la focalisation des rayons laser aux points lumineux prévus.
  9. Dispositif selon la revendication 8, caractérisé par un générateur d'impulsions de déclenchement (8), qui produit des signaux de déclenchement à partir des impulsions de rayons délivrés par le laser (1) et par une commande par ordinateur, qui en réponse à une impulsion de déclenchement produit, à partir des données des coordonnées du point lumineux à produire, un signal de commande, pour un dispositif de positionnement (7), avec lequel le dispositif optique (3) est réglé.
EP94920440A 1993-06-14 1994-06-09 Procede et dispositif permettant de produire des images bi- ou tridimensionnelles dans des substances gazeuses Expired - Lifetime EP0704085B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4319680A DE4319680A1 (de) 1993-06-14 1993-06-14 Verfahren und Vorrichtung zum Erzeugen von zwei- oder dreidimensionalen Bildern in gasförmigen Medien
DE4319680 1993-06-14
PCT/EP1994/001888 WO1994029837A1 (fr) 1993-06-14 1994-06-09 Procede et dispositif permettant de produire des images bi- ou tridimensionnelles dans des substances gazeuses

Publications (2)

Publication Number Publication Date
EP0704085A1 EP0704085A1 (fr) 1996-04-03
EP0704085B1 true EP0704085B1 (fr) 1997-03-26

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EP94920440A Expired - Lifetime EP0704085B1 (fr) 1993-06-14 1994-06-09 Procede et dispositif permettant de produire des images bi- ou tridimensionnelles dans des substances gazeuses

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Country Link
US (1) US5871267A (fr)
EP (1) EP0704085B1 (fr)
DE (2) DE4319680A1 (fr)
WO (1) WO1994029837A1 (fr)

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DE19837425A1 (de) * 1998-08-18 2000-03-02 Andre Srowig Vorrichtung zur volumetrischen Wiedergabe eines dreidimensionalen Bildes in autostereoskopischer Darstellung durch gepulste Plasmaerzeugung in natürlicher Atmosphäre mittels eines einzelnen fokussierten Laserstrahls
DE10127549A1 (de) * 2001-06-01 2002-12-05 Opto System Gmbh Verfahren zur Änderung des Abstrahlverhaltens in einem flächig ausgebildeten, lichtleitenden, transparenten Körper und Einrichtungen mit solchen Körpern
JP3650811B2 (ja) * 2002-02-13 2005-05-25 株式会社トプコン 空中可視像形成装置
AU2003304004A1 (en) * 2003-03-20 2004-10-11 Anton A. Dremlyuga Method and device for generating spatial images
US20060255020A1 (en) * 2005-05-16 2006-11-16 Igor Troitski Method for production of laser-induced images inside liquids
US7710643B2 (en) * 2007-01-31 2010-05-04 Alion Science And Technology Corporation Apparatus for and method of delivering visual image into air
DE102012014364B3 (de) * 2012-07-20 2013-11-28 Audi Ag Anzeigeeinrichtung
ES2614228B2 (es) * 2016-09-13 2018-01-09 Defensya Ingeniería Internacional, S.L. Dispositivo para la creación de señalización luminosa en el espacio circundante a uno o más vehículos
JP2019117227A (ja) * 2017-12-26 2019-07-18 トヨタ自動車株式会社 車載装置および車両システム
EP3951380A4 (fr) * 2020-01-16 2022-09-07 Anhui Easpeed Technology Co., Ltd. Dispositif d'affichage à ionisation d'air
CN111208193A (zh) * 2020-01-16 2020-05-29 安徽省东超科技有限公司 一种空气电离显示装置
DE102020124649A1 (de) 2020-09-22 2022-03-24 Bayerische Motoren Werke Aktiengesellschaft Verfahren und vorrichtung zum erzeugen einer volumengrafik

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US3914655A (en) * 1973-06-28 1975-10-21 Ibm High brightness ion source
DE3805053A1 (de) * 1988-02-18 1989-08-31 Heinrich Prof Dr Ing Reents Verfahren mit den dazu gehoerigen vorrichtungen zur lenkung eines laserstrahls mit hilfe einer flexiblen spiegelflaeche
US4870485A (en) * 1988-09-23 1989-09-26 Fmc Corporation Three dimensional image generating apparatus having a phosphor chamber
DE4027471C2 (de) * 1990-08-30 1994-10-13 Drescher Ruediger Gerät zur räumlichen Darstellung von Bildern
JPH04180084A (ja) * 1990-11-15 1992-06-26 Hiroshi Daimon 映像装置
DE4128949C2 (de) * 1991-08-31 1994-02-03 Drescher Ruediger Gerät zur räumlichen Darstellung von Bildern
JP3174607B2 (ja) * 1992-02-10 2001-06-11 株式会社日立製作所 三次元ディスプレイ装置
US5450147A (en) * 1992-09-28 1995-09-12 The Boeing Company Method for controlling projection of optical layup template utilizing cooperative targets
JP2729021B2 (ja) * 1993-10-13 1998-03-18 株式会社日立製作所 レーザで星空に重畳して画像を描く方法及び装置

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Publication number Publication date
WO1994029837A1 (fr) 1994-12-22
US5871267A (en) 1999-02-16
EP0704085A1 (fr) 1996-04-03
DE59402243D1 (de) 1997-04-30
DE4319680A1 (de) 1994-12-15

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