Device for controlling vibration-free movement of an optical element in a stellar inteferometer and stellar interferometer comprising same

摘要

A carriage moves on a track and carries, through a flexible linkage, a chassis to which is fixed a payload including an optical element. A linear actuator controls the linkage so as to correct imperfections in displacement of the payload. A piezo-electric accelerometer delivers a filtered signal to control the linear actuator so as to eliminate the effect on the payload of vibration of the carriage. There are two independent control loops, one for controlling the carriage and the other for controlling the chassis. The device is applicable to controlling the mobile part of an optical delay line or of a telescope in a stellar interferometer.