Patent ID: 6407810
Filing Date: 2002-06-18
Classification: G01N,G02B

Abstract:
A system for imaging an object, comprising:a light source for illuminating the object with excitation light, the excitation light from the light source having a first wavelength; a dark field illumination system for illuminating the object with light having a third wavelength; an image capturing device; a filter device which is transmissive for fluorescent light emitted by foreign matter on the object and for light at the third wavelength reflected by the object, the fluorescent light being at a second wavelength different from the first wavelength, the filter device further being reflective for light having the first wavelength reflected by the object, the image capturing device positioned to capture an image of at least a portion of the object and the foreign matter on the object using light transmitted through the filter device; and a processor actuating the light source and the dark field illumination system to illuminate the object with the excitation light from the light source and light from the dark field illumination simultaneously.