OPTICAL TRANSDUCER FOR THE DETECTION AND THE REMOTE INDICATION OF THE POSITIONS OF A MOVABLE MEMBER, PARTICULARLY OF A VALVE MEMBER, ALONG A PATH BETHWEEN TWO END-OF-TRAVEL POSITIONS

摘要

The transducer comprises a pair of fixed and rigid supports (14, 16), fast to each other and located on one side and the other side, respectively, of a dimming plane (P) along which a dimmer (24) moves. One of the supports carries a row of light- emitting diodes (PE) and the other carries a corresponding row of light-receiving diodes (PR). The rows of diodes (PE; PR) extend along respective paths parallel to each other and located on respectiv opposite sides of the dimming plane (P) in which the dimmer is movable. The dimmer (24) has, in the dimming plane, an edge whose outline is such that the light-receiving diodes (PR) are progressively masked and illuminated. The transducer further comprises processing means adapted to receive the electrical signals from light-receiving diodes (PR) and to deliver at least one signal indicative of the masking proportion of the light receiving diodes by the dimmer (24).