Digital optical transducer for object displacements detection - has coded reading track and optical fibre transmission of signals cooperating with reading head connected to CPU

The transducer utilises sequences of digital optical signals and remotely transmits these signals to a calculating unit with opto-electronic inputs which analyses and processes the signals, making them directly usable. The device has a reading track (11) which is mounted on the moving object whose displacements are to be measured. The track takes the form of a plane strip (12) on which there are four reading lines (L1,L2,L3,L4) parallel to the longitudinal axis of the strip. Each line is composed of a series of optically reflecting sectors (13) alternating according to a predetermined code with a series of optically absorbing sectors (14). To the right of the reading track there is a reading head (15) having a body (15') crossed by four optical fibres (16,17,18,19) each corresponding to a reading line with their ends aligned normal to the plane of the reflecting sectors as they pass under the head. The other ends of the fibres are connected either to a continuously emitting luminous source (23) or to the opto-electronic inputs of the calculating unit (24). CE TRANSDUCTEUR PERMET D'IDENTIFIER LES DEPLACEMENTS D'UN OBJET MOBILE PAR DES SEQUENCES DE SIGNAUX OPTIQUES NUMERIQUES ET A TRANSMETTRE CES SIGNAUX A UN ORGANE DE CALCUL. IL FAIT INTERVENIR SUR L'OBJET MOBILE, UNE PISTE DE LECTURE 11 A PLUSIEURS LIGNES DE LECTURE L, L, L, L COMPORTANT CHACUNE UNE SERIE DE SECTEURS REFLECHISSANTS 13 ALTERNANT AVEC DES SECTEURS ABSORBANTS ET UN LECTEUR OPTIQUE COMPRENANT UNE FIBRE OPTIQUE PAR LIGNE DE LECTURE. CES FIBRES OPTIQUES COMPRENNENT UNE EXTREMITE SITUEE AU DROIT D'UNE LIGNE DE LECTURE ET AXEE NORMALEMENT AU PLAN DES SECTEURS REFLECHISSANTS ET SONT CONNECTEES A LEURS AUTRES EXTREMITES A UNE SOURCE LUMINEUSE 23 ET A DES ENTREES OPTOELECTRONIQUES DE L'ORGANE DE CALCUL 24.L'INVENTION S'APPLIQUE NOTAMMENT A LA DETECTION DE LA POSITION D'UN ORGANE COMMANDE DANS UN DISPOSITIF DE SERVOCOMMANDE.