OPTICAL EXPLORER DEVICE, AND MIRROR TARGET SUITABLE FOR USE IN SUCH DEVICE.

摘要

AN OPTICAL SCANNING DEVICE IS DESCRIBED WITH A SPECULAR TARGET (30) ARRANGED BETWEEN A RADIATION SOURCE (40) AND AN OBJECT (10) TO BE SCANNED, WHOSE SPECULAR TARGET INCLUDES TWO RADIATION WINDOWS (31, 34) REFLECTORS (32, 33). BY PROVIDING AN ASPHERICAL SHAPE TO ONE OF THE WINDOWS (31, 34), THE SPECULAR PURPOSE IS PROPERLY CORRECTED FOR SPHERICAL ABERRATIONS, WHILE IT IS NOT NECESSARY TO IMPOSE STRICT REQUIREMENTS ON THE SURFACE (35).