| 摘要 |
Method and device for measuring angles by reflectometry, comprising a light source (22) with small spectral width, emitting a collimated light beam towards a reflector (10) in the shape of the corner of a cube (corner reflector), comprising a diffraction grating (14) on its input face, the cube corner being movable in rotation about an axis parallel to the lines of the grating (14), the light beams reflected by the cube corner (10) and which are of diffraction order +1 and -1 being picked up by photodetectors (32) in the focal plane (28) of the lens (24) for collimating the incident beam. By measuring the phases of the output signals of the photodetectors, it is possible to obtain the value of the angle alpha between the optical axis (20) and the normal to the input face of the cube corner. <IMAGE> |
