FR2514917A1 - Optical fibre position detector - has several fibres abutting partially reflecting tracks of differing lengths such that reflected light signal indicate movement of tracks - Google Patents
Optical fibre position detector - has several fibres abutting partially reflecting tracks of differing lengths such that reflected light signal indicate movement of tracks Download PDFInfo
- Publication number
- FR2514917A1 FR2514917A1 FR8119626A FR8119626A FR2514917A1 FR 2514917 A1 FR2514917 A1 FR 2514917A1 FR 8119626 A FR8119626 A FR 8119626A FR 8119626 A FR8119626 A FR 8119626A FR 2514917 A1 FR2514917 A1 FR 2514917A1
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- France
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- tracks
- optical fibre
- reflected light
- light signal
- fibre
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/22—Analogue/digital converters pattern-reading type
- H03M1/24—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip
- H03M1/26—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with weighted coding, i.e. the weight given to a digit depends on the position of the digit within the block or code word, e.g. there is a given radix and the weights are powers of this radix
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
Abstract
Description
La présente invention concerne un capteur de positionnement et de mouvement a fibres optiques. The present invention relates to a positioning and motion sensor with optical fibers.
Beaucoup d'installations industielles,administratives,de recherches,
de protections etc... sont schématisablescomme il est représenté à la
figure 1.Dans cette figure,l est une unite centrale,chargée de collationner
les renseignements fournis par les capteurs 2,3,4 etc... et de faire parvenir des instructions à des organes d'exécution 5,6 etc...Lots of industrial, administrative, research facilities,
protections etc ... are diagrammable as it is represented in the
figure 1. In this figure, l is a central unit, responsible for collating
the information provided by the sensors 2,3,4 etc ... and to send instructions to executing bodies 5,6 etc ...
Or ,indépendament de tout autre problème,un tel ensemble est soumis à des agressions multiples sur les capteurs,l'unité centrale, les organes d'exécution et les liaisons.Ces agressions dues aux variations rapides et intenses des champs électriques et magne tiques générées par les coups de foudre ,les disjonctions de réseaux etc...,sont d'autant plus dangereuses que les matériels modernes sont plus susceptibles.However, independently of any other problem, such an assembly is subjected to multiple attacks on the sensors, the central unit, the execution organs and the links. These attacks due to the rapid and intense variations of the electric fields and magnetic fields generated. by lightning strikes, disjunction of networks etc ..., are all the more dangerous as modern equipment is more susceptible.
Pour protéger les liaisons,on emploie trés souvent le dispositif schématisé à la figure n02.Dans cette figure ,le capteur 2, délivre un signal électrique qui est transformé en signal optique par l'interface 7. To protect the links, the device shown diagrammatically in FIG. 02 is very often used. In this figure, the sensor 2 delivers an electrical signal which is transformed into an optical signal by the interface 7.
6a-fibr optique 8 transporte les renseignements à proximité de l'unité centralel où un interface 9,-retransfome les signaux électriques. 6a-optical fiber 8 carries the information near the central unit where an interface 9, -transfers the electrical signals.
Cette solution,qui donne satisfactionest lourde car l'utilisàtion de deux interfaces 7 et 9,est onéreuse et augmente le suscéptibilité intrinsèque,demande de lténergie électrique et introduit des distorsions. This solution, which gives satisfaction is cumbersome because the use of two interfaces 7 and 9, is expensive and increases the intrinsic elongation, requires electrical energy and introduces distortions.
Or,beaucoup de capteurs traduisent le renseignement souhaité en deplacements mécaniques,eux-même traduits en signaux électriques. C'est le cas évidement, des prises de cotes linéaires ou angulairee,mais également,des manomètres, des thermomètres à bilame ou à dilatation de liquides etc...Des dispositifs variés :potentiomètres,selsyns, mutuelles
inductances, capacités variables etc... transforment ces deplacements en
signaux électriques.However, many sensors translate the desired information into mechanical displacements, themselves translated into electrical signals. This is obviously the case, taking linear or angular measurements, but also, manometers, bimetal or dilation thermometers of liquids etc ... Various devices: potentiometers, selsyns, mutuals
inductances, variable capacities etc ... transform these displacements into
electrical signals.
On obtient donc pour un capteur,la succession symbolique de la figure n03. Le phénomène physique A est traduit par un déplacement mécaniqueB
traduit en signal électrique en 2,puis l'interface optique 7 donne un
signal lumineuxóu infrarouge
La présente invention a pour but de remplacer une telle chaine par un
capteur qui,transformant le phénomène à mesurer en déplacement mécanique,
transmet celui-ci,directement sur la fibre optique (fig.4).0n comprendra mieux l'essentiel du capteur,objet du présent brevet en se reportant à
la figure n05.We thus obtain for a sensor, the symbolic succession of figure n03. The physical phenomenon A is translated by a mechanical displacement B
translated into an electrical signal in 2, then the optical interface 7 gives a
infrared light signal
The present invention aims to replace such a chain with a
sensor which, transforming the phenomenon to be measured into mechanical displacement,
transmits it directly on the optical fiber (fig. 4). We will better understand the main part of the sensor, object of this patent by referring to
figure n05.
On a choisi comme exemple un capteur de déplacement,mais la description qui suit s'appliquerait aussi bien à un capteur de rotation. A displacement sensor has been chosen as an example, but the following description would apply equally well to a rotation sensor.
Le déplacement proprement dit ,est mesuré d'une façon classique,en entrainant un ruban codé 10.The actual displacement is measured in a conventional manner, by driving a coded tape 10.
On a représenté à la figure n05,un codage binaire normal, 4 bits, mais tout nombre et tout code de bits est possible. Le film codé 10 est éclairé comme nous le verrons plus ploin. Quatre fibres optiques 12,13,14, 15,transmettent ou non la lumierell,suivant que,sur la piste considérée, le film est transparent (niveau zéro) ou opaque (niveau 1). Ces fibres peuvent emmener l'information jusqu'à l'unité centrale ,mais à la figure n05,on a schématisé une autre solution. FIG. 05 shows a normal binary coding, 4 bits, but any number and any bit code is possible. The film coded 10 is lit as we will see later. Four optical fibers 12, 13, 14, 15 transmit or not the lumierell, depending on whether, on the track considered, the film is transparent (level zero) or opaque (level 1). These fibers can carry information to the central processing unit, but in figure n05, we have schematized another solution.
Chaque piste est munie de filtres optiques sélectionnant des bandes de longueur d'ondes differentes. Deux coupleurs 16et 17,regroupent les 4 informations sur une fibre unique 21. Each track is fitted with optical filters selecting bands of different wavelengths. Two couplers 16 and 17 combine the 4 pieces of information on a single fiber 21.
On pourra sans sortir des limites de l'invention ,utiliser des coupleurs à 3,4 ou n voies.On pourra également utiliser plusieurs fibres. Without going beyond the limits of the invention, it is possible to use couplers with 3.4 or n channels. It is also possible to use several fibers.
Il est évident toutefois que le produit du nombre de fibres partant vers l'unité centrale par le nombre de bandes de longueur d'onde,doit être égal au nombre de pistes. du. film 0. It is obvious however that the product of the number of fibers leaving towards the central unit by the number of bands of wavelength, must be equal to the number of tracks. of. movie 0.
La lumiere 11 peut être soit naturelle,ce serait le cas par exemple, d'un capteur dans une usine ne travaillant que le jour.Elle peut également être produite localement par une source de lumière électrique.Elle peut enfin être amenée depuis l'unité centrale par une ou des fibres optiques. The light 11 can be either natural, this would be the case for example of a sensor in a factory working only during the day. It can also be produced locally by an electric light source. It can finally be brought from the unit central by one or more optical fibers.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8119626A FR2514917A1 (en) | 1981-10-19 | 1981-10-19 | Optical fibre position detector - has several fibres abutting partially reflecting tracks of differing lengths such that reflected light signal indicate movement of tracks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8119626A FR2514917A1 (en) | 1981-10-19 | 1981-10-19 | Optical fibre position detector - has several fibres abutting partially reflecting tracks of differing lengths such that reflected light signal indicate movement of tracks |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2514917A1 true FR2514917A1 (en) | 1983-04-22 |
Family
ID=9263176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8119626A Pending FR2514917A1 (en) | 1981-10-19 | 1981-10-19 | Optical fibre position detector - has several fibres abutting partially reflecting tracks of differing lengths such that reflected light signal indicate movement of tracks |
Country Status (1)
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FR (1) | FR2514917A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1979000180A1 (en) * | 1977-10-05 | 1979-04-19 | Hectronic Ag | Indicator for a limit value and a measurement value |
FR2417753A1 (en) * | 1978-02-15 | 1979-09-14 | Hitachi Ltd | REMOTE OPTICAL MEASUREMENT AND CONTROL SYSTEM OF AN OBJECT UNDERGOING A PHYSICAL TRANSFORMATION |
FR2427584A1 (en) * | 1978-06-02 | 1979-12-28 | Asea Ab | OPTICAL FIBER DEVICE FOR THE MEASUREMENT OF PHYSICAL QUANTITIES SUCH AS POSITION, SPEED, FORCE, PRESSURE AND OTHER SIMILAR QUANTITIES |
GB2042168A (en) * | 1979-01-31 | 1980-09-17 | Bbc Brown Boveri & Cie | Optical pick-up and transmission of a parameter being measured |
EP0030477A1 (en) * | 1979-12-10 | 1981-06-17 | Bertea Corporation | Optical position transducer |
-
1981
- 1981-10-19 FR FR8119626A patent/FR2514917A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1979000180A1 (en) * | 1977-10-05 | 1979-04-19 | Hectronic Ag | Indicator for a limit value and a measurement value |
FR2417753A1 (en) * | 1978-02-15 | 1979-09-14 | Hitachi Ltd | REMOTE OPTICAL MEASUREMENT AND CONTROL SYSTEM OF AN OBJECT UNDERGOING A PHYSICAL TRANSFORMATION |
FR2427584A1 (en) * | 1978-06-02 | 1979-12-28 | Asea Ab | OPTICAL FIBER DEVICE FOR THE MEASUREMENT OF PHYSICAL QUANTITIES SUCH AS POSITION, SPEED, FORCE, PRESSURE AND OTHER SIMILAR QUANTITIES |
GB2042168A (en) * | 1979-01-31 | 1980-09-17 | Bbc Brown Boveri & Cie | Optical pick-up and transmission of a parameter being measured |
EP0030477A1 (en) * | 1979-12-10 | 1981-06-17 | Bertea Corporation | Optical position transducer |
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