OPTICAL MEASURING ARRANGEMENTS
Original Publication Date: 1977-Oct-31
Included in the Prior Art Database: 2004-Mar-31
Xerox Disclosure Journal
An apparatus for measuring small defects in a specular surface uses a laser scanning system as shown in Figures 1 and 2 which shines a narrow beam tangentially across the surface of the specular surface of a roller 21 to be inspected. Small de-fects, shown exaggerated in Figure 3, are detected by the time such defects obscure the laser beam. Using the time period of obscurity of the laser beam, the heights of the defects (the speed of rotation of the roller 21 being known) are computed.