| 摘要 |
The optical system has a focal plane (F), with its field of view centred on an optical axis (V-V). Detector assemblies (13) are fixed on the focal plane, receiving the reflected beam image in the entry pupil on a predetermined line of sight (Z-Z). A test object (15) is seen as an image at infinity, at the entry pupil. A measurement signal generated by the detector is received. The optical instrument generates the test object internally, in the focal plane and in its direction. A plane mirror (20) is placed in the parallel light rays from the entry pupil, to reflect them back along the line of sight. The test object may be supplied from a light source (21) via an optical fibre (22). <IMAGE> |
