SYSTEM AND METHOD FOR NON-CONTACT MEASUREMENT OF A MOVEMENT OR RELATIVE POSITIONING OF TWO ADJACENT OBJECTS CAPACITIVELY, AND APPLICATION TO THE CONTROL OF MIRRORS

摘要

P Non-contact system (S ') for measuring a relative displacement or a relative position of a first object relative to a second object, comprising a sensor module (1) comprising a transmitting plate fixed to the first object and a receiving plate linked to the second object, arranged substantially opposite and provided with electrodes resp. The transmitting and receiving electrodes are arranged to constitute a first capacitance varying as a function of the distance separating the emitting and receiving plates and a second capacitance varying as a function of the relative misalignment of said plates. An electronic module (500) is provided for perform an analog calculation (i) of a first signal representative of the inverse of the first capacitance and (ii) of a second signal representative of the ratio of the second capacitance to the first capacitance. Use in particular for the control of segmented mirrors in large telescopes /P