| 主权项 |
1. An interferometer comprising:
a splitting plate, adapted to split an initial radiation beam into two secondary beams; two optical arms equipped with reflecting surfaces effective for the secondary beams, each arm being intended for one of the secondary beams and being in outward-return form between the splitting plate and the reflecting surface of said arm, the reflecting surfaces being oriented in order to superimpose from the splitting plate, the two secondary beams originating from the respective arms in an output beam; in a first one of the optical arms: a variable-thickness system comprising two mobile prisms called respectively internal and external, the external prism having an external face constituting the reflecting surface of the first optical arm; in a second one of the optical arms: a mirror constituting the reflecting surface of said second optical arm, and a compensation assembly adapted so that respective optical thicknesses of said compensation assembly and of the variable-thickness system of the first optical arm are equal when an optical path length difference between the two optical arms is zero; a mobile system adapted to displace the internal and external prisms along directions that are opposite and parallel to facing surfaces of the prisms, so as to modify simultaneously an optical path length of the first optical arm and the thickness of the variable-thickness system; an output optical arm comprising a detector arranged to receive the output beam, and produce a signal representing an intensity of said output beam; and a calculation unit, adapted to calculate a Fourier transform of the signal produced by the detector, as a function of a parameter representing the difference in length of the optical path between the two arms;characterized in that the mobile system has a single degree of freedom of movement and itself comprises:
at least one pair of levers having identical lengths within one and same pair, rotatably hinged about respective points that are fixed with respect to the splitting plate along respective main axes parallel to each other within the pair of levers, by means of rotating connexions, each with one single axis; and two support elements each borne by the two levers of one and the same pair by means of additional rotating connexions, each with one single axis parallel to the main axes of said pair of levers; and an actuation system, adapted to cause a rotation of the levers so that each support element is displaced while remaining parallel to itself when the actuation system is activated;the internal and external prisms are respectively borne by the two support elements; anda ratio between respective displacement lengths of the internal and external prisms is constant and set by distances between the fixed points and the additional rotating connexions, so that the mobile system simultaneously produces a variation of the optical path length difference between the two optical arms and a self-apodization compensation of an interferogram resulting from the signal produced by the detector when the actuation system is activated. |
