FR2477288A1 - Light trap with angular discrimination - has hollow housing with internal diaphragms and coaxial openings with light absorbent coating - Google Patents

Light trap with angular discrimination - has hollow housing with internal diaphragms and coaxial openings with light absorbent coating Download PDF

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Publication number
FR2477288A1
FR2477288A1 FR8004762A FR8004762A FR2477288A1 FR 2477288 A1 FR2477288 A1 FR 2477288A1 FR 8004762 A FR8004762 A FR 8004762A FR 8004762 A FR8004762 A FR 8004762A FR 2477288 A1 FR2477288 A1 FR 2477288A1
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France
Prior art keywords
diaphragms
light
diameters
given direction
absorbent coating
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Application number
FR8004762A
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French (fr)
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Individual
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Individual
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Priority to FR8004762A priority Critical patent/FR2477288A1/en
Publication of FR2477288A1 publication Critical patent/FR2477288A1/en
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/005—Diaphragms

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The trap receives a light flux from a given direction with a wide selective angular range. It consists of diaphragms which are parallel to each other with coaxial circular openings. These make up a series of cells in a hollow space. The values of the diameters of the openings vary linearly from the diameters of the entry and exit diaphragms. The diaphragms have absorbent coatings on them in the hollow spaces. This eliminates parasitic light rays.

Description

La présente invention a pour objet à titre de produit industriel nouveau un dispositif qui permet de recevoir un flux lumineux d'une direction donnée en éliminant les luminosités parasites qui proviennent de directions voisines. I1 autorise une plus grande sélectivité angulaire dans la déter mination du flux lumineux à transmettre qu'avec les appareillages existants. The subject of the present invention is, as a new industrial product, a device which makes it possible to receive a light flux from a given direction by eliminating the stray luminosities which come from neighboring directions. I1 allows greater angular selectivity in determining the luminous flux to be transmitted than with existing equipment.

Ce dispositif est remarquable en ce qu'il agit comne un corps noir principalement pour tous les rayons lumineux qui pénètrent en lui en faisant un angle supérieur à un angle donné, déterminé par construction, avec l'axe du dispositif. L'élimination de tels rayons lumineux se fait par reflexions multiples dans un volume divisé en cellules et dont les parois sont des surfaces absorbantes. This device is remarkable in that it acts as a black body mainly for all the light rays which penetrate into it by making an angle greater than a given angle, determined by construction, with the axis of the device. The elimination of such light rays is done by multiple reflections in a volume divided into cells and whose walls are absorbent surfaces.

Une forme d'exécution de la présente invention est décrite ci-après à titre indicatif et nullement limitatif en se référant au dessin annexé. An embodiment of the present invention is described below by way of indication and in no way limitative with reference to the accompanying drawing.

Un corps creux est séparé intérieurement en cellules par des diaphrag mes,parallèles entre eux, percés d'ouvertures circulaires et coaxiales. Une ouverture O permet à la lumière d'entrer dans le dispositif. Par l'ouverture
S sort une partie de la lumiere. La dimension maximale d'ouverture d'un diaphragme interne varie linéalrenent,en fonction de sa position dans le dispositif, entre les dimensions de O et de S. Les dimensions sont les mêmes que celles de O et de S pour O et S ayant même ouverture. L'ouverture de O peut être de dimension supérieure, inférieure ou égale à celle de S.Les rayons lumineux qui pénètrent en O à l'extérieur d'un cône d'admission dont la géométrie est fonction des dimensions respectives des ouvertures O et S sont éliminés lors des réflexions multiples dans les cellules internes du fait de l'absorption par les parois à chaque réflexion. La succession des diaphragmes évite ainsi la transmission par réflexion sur les parois internes du cylindre (en se référant au corps creux choisi pour le dessin annexé) si celles ci n'absorbent pas parfaitement la lumière.A hollow body is internally separated into cells by diaphragms, parallel to each other, pierced with circular and coaxial openings. An opening O allows light to enter the device. By the opening
Part of the light comes out. The maximum opening dimension of an internal diaphragm varies linearly, depending on its position in the device, between the dimensions of O and S. The dimensions are the same as those of O and S for O and S having the same opening. The opening of O can be of greater dimension, less than or equal to that of S. The light rays which penetrate in O outside of an intake cone whose geometry is a function of the respective dimensions of the openings O and S are eliminated during multiple reflections in internal cells due to absorption by the walls on each reflection. The succession of diaphragms thus avoids transmission by reflection on the internal walls of the cylinder (with reference to the hollow body chosen for the appended drawing) if these do not perfectly absorb the light.

Le dessin, qui a été executé à titre illustratif dans le cas simple où les dimensions de O et de S sont égales et pour un ensemble seulement de deux diaphragmes internes, présente un exemple de rayon transmis (pointillés) et un exemple de rayon absorbé (trait continu). The drawing, which was executed by way of illustration in the simple case where the dimensions of O and S are equal and for a set of only two internal diaphragms, shows an example of transmitted ray (dotted lines) and an example of absorbed ray ( solid line).

Il est bien entendu que la présente invention n'est pas limitée au mode de réalisation décrit, et représenté, qui constitue seulement un exemple auquel de nombreuses modifications peu ont être apportées sans qu'on s'écarte de la présente invention. Ainsi ,et entre autres choses, le nombre des diaphragmes internes, de même que les divers paramètres géométrìques, depender.t de l'efficacité angulaire recherchée et de la destination particulière du dispositif. It is understood that the present invention is not limited to the embodiment described, and shown, which is only an example to which many modifications have been made without departing from the present invention. Thus, and among other things, the number of internal diaphragms, as well as the various geometrical parameters, depend on the angular efficiency sought and the particular destination of the device.

Le présent dispositif peut être applique, par exenple, à 1a determination d'un champ d'observation étroit, dans les systèmes de detection de proxi mite qui utilisent la lumière réfléchie par les obstacles dont la présence doit être décelée. Cela que la lumiere soit ,ou non, émise par le système de détection de proximité.  The present device can be applied, for example, to the determination of a narrow field of observation, in proximity detection systems which use the light reflected by the obstacles whose presence must be detected. Whether light is emitted by the proximity detection system or not.

Claims (1)

REVENDICATIONS L'invention a pour objet: I) Un dispositif qui pertmet de recevoir un flux lumineux d'une direction donnée avec une grande sélectivité angulaire. Ce dispositif est caractérisé par les points suivants: 10) une succession de diaphragmes, parallèles entre eux et d'ouvertures circulaires coaxiales,caractérisée par le fait qu'elle découpe une série de cellules dans un volume creux, 29) une succession de diaphragmes selon la revendication 1 caractérise par le fait que les valeurs des diamètres d'ouvertures des diaphragmes varient line- airement entre les valeurs des diamètres d'ouvertures des diaphragmes d'entrée et de sortie,CLAIMS The subject of the invention is: I) A device which allows to receive a light flux from a given direction with high angular selectivity. This device is characterized by the following points: 10) a succession of diaphragms, mutually parallel and of coaxial circular openings, characterized in that it cuts out a series of cells in a hollow volume, 29) a succession of diaphragms according to claim 1, characterized in that the values of the diameters of apertures of the diaphragms vary linearly between the values of the diameters of apertures of the inlet and outlet diaphragms, 30) une succession de diaphragmes selon la revendication 1 avec revêtement absorbant sur les parois internes du volume creux et sur les diaphragmes. 30) a succession of diaphragms according to claim 1 with absorbent coating on the internal walls of the hollow volume and on the diaphragms. II) A titre de produit industriel nouveau, le dispositif qui permet d'éliminer les rayons lumineux parasites qui proviennent de directions autres qu'une direction donnée, en agissant comme un corps noir pour ces rayons parasites et comme un espace transparent pour les rayons provenants de la direction donnée.  II) As a new industrial product, the device which makes it possible to eliminate parasitic light rays which come from directions other than a given direction, by acting as a black body for these parasitic rays and as a transparent space for the coming rays. of the given direction.
FR8004762A 1980-03-03 1980-03-03 Light trap with angular discrimination - has hollow housing with internal diaphragms and coaxial openings with light absorbent coating Withdrawn FR2477288A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8004762A FR2477288A1 (en) 1980-03-03 1980-03-03 Light trap with angular discrimination - has hollow housing with internal diaphragms and coaxial openings with light absorbent coating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8004762A FR2477288A1 (en) 1980-03-03 1980-03-03 Light trap with angular discrimination - has hollow housing with internal diaphragms and coaxial openings with light absorbent coating

Publications (1)

Publication Number Publication Date
FR2477288A1 true FR2477288A1 (en) 1981-09-04

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FR8004762A Withdrawn FR2477288A1 (en) 1980-03-03 1980-03-03 Light trap with angular discrimination - has hollow housing with internal diaphragms and coaxial openings with light absorbent coating

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FR (1) FR2477288A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984004821A1 (en) * 1983-05-24 1984-12-06 Incom Inc Light filter
US4542963A (en) * 1984-03-28 1985-09-24 The United States Of America As Represented By The United States National Aeronautics And Space Administration Optical system with reflective baffles
EP0218865A1 (en) * 1985-09-09 1987-04-22 Siemens Aktiengesellschaft Test arrangement for the contactless ascertainment of flows in non-structured surfaces
US4669813A (en) * 1984-08-01 1987-06-02 Incom, Inc. Faceplate incorporating an off-axis filter
DE3841979A1 (en) * 1988-12-14 1990-06-21 Teldix Gmbh BACKFLOW-FREE LIGHT TRAP
EP0495569A2 (en) * 1991-01-15 1992-07-22 Beckman Instruments, Inc. Stray light trap in a monochromator
EP0760486A1 (en) * 1995-08-28 1997-03-05 Aerospatiale Societe Nationale Industrielle Light trap
EP1039263A2 (en) * 1999-03-26 2000-09-27 Kabushiki Kaisha Topcon Surveying system

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984004821A1 (en) * 1983-05-24 1984-12-06 Incom Inc Light filter
US4542963A (en) * 1984-03-28 1985-09-24 The United States Of America As Represented By The United States National Aeronautics And Space Administration Optical system with reflective baffles
US4669813A (en) * 1984-08-01 1987-06-02 Incom, Inc. Faceplate incorporating an off-axis filter
EP0218865A1 (en) * 1985-09-09 1987-04-22 Siemens Aktiengesellschaft Test arrangement for the contactless ascertainment of flows in non-structured surfaces
US4768878A (en) * 1985-09-09 1988-09-06 Siemens Aktiengesellschaft Test arrangement for non-contacting identification of defects in non-structured surfaces
DE3841979A1 (en) * 1988-12-14 1990-06-21 Teldix Gmbh BACKFLOW-FREE LIGHT TRAP
EP0495569A2 (en) * 1991-01-15 1992-07-22 Beckman Instruments, Inc. Stray light trap in a monochromator
EP0495569A3 (en) * 1991-01-15 1993-02-24 Beckman Instruments, Inc. Stray light trap in a monochromator
EP0760486A1 (en) * 1995-08-28 1997-03-05 Aerospatiale Societe Nationale Industrielle Light trap
FR2738355A1 (en) * 1995-08-28 1997-03-07 Aerospatiale LIGHT TRAP
US5745293A (en) * 1995-08-28 1998-04-28 Aerospatiale Societe Nationale Industrielle Light trap
EP1039263A2 (en) * 1999-03-26 2000-09-27 Kabushiki Kaisha Topcon Surveying system
EP1039263A3 (en) * 1999-03-26 2002-04-10 Kabushiki Kaisha Topcon Surveying system

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