| 摘要 |
<p>A number of luminous sources (4) are arranged in a ring-shaped manner in a plane and individually and successively emit, in a rotating manner on the ring, an incident beam oriented toward the axis (5) of the ring and diagonal to this axis at an angle that is not a right angle. This beam is reflected by the object (2) placed essentially along the axis (5), whereupon it is received by one of the photodetectors (8a, 8b, 8c) situated in a plane parallel to the ring of sources. The presence of a shape defect, of a surface irregularity or of a variation in color is determined by modulating the energy received by the photodetectors. This measure provides a very good resolution of the successive lighting of very small areas of the object surface.</p> |
