Electronic control and regulation system

摘要

A reflector of an optical system has its position controlled by piezoelectric devices operating at three points of the reflector disposed at the apices of an equilateral triangle. These are driven by summing amplifiers each of which has an input to which a signal for producing displacement of the reflector without change of tilt is provided and one or more inputs connected to the output of a matrix circuit responsive to signals for producing tilt of the reflector about two mutually perpendicular axes both perpendicular to the direction of displacement produced by the previously mentioned inputs. The tilt is regulated with reference to a fixed mirror of the system or the like by means of a signal derived from radiation passing through the optical system, by causing a slight rocking back and forth of the mirror first about one axis and then about the other and determining the magnitude and sign of the difference signal for each direction of tilt about the same axis and then adding the resulting correction to a bias voltage representing the desired tilt angle.