Surface sensor
Patent 4092068 Issued on May 30, 1978. Estimated Expiration Date: 
May 30, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 30, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2947212 3591291 3834822 Method and apparatus for detecting defects in a surface regardless of surface finish Patent #: 3984189 InventorsAssigneeApplicationNo. 683477 filed on 05/05/1976US Classes:356/73, PLURAL TEST162/198, With measuring, inspecting and/or testing250/559.16, Detection of diffuse light250/559.22, Profile356/429, BY MONITORING OF WEBS OR THREAD356/446, With diffusion356/601SHAPE OR SURFACE CONFIGURATIONExaminersPrimary: McGraw, Vincent P.Attorney, Agent or FirmInternational ClassesG01N 021/00G01N 021/18 G01N 021/30 AbstractA surface sensor utilizing a light source for projecting light onto a travelling surface and thereby illuminate a limited area of said surface is combined with at least two angularly spaced sensors and arranged to detect light reflected. Signals are generated in accordance with the amount of light received and these signals are processed to obtain at least one of (a) an indication of topographical surface characteristics of the web surface while suppressing the effects of changes in reflectivity of the surface and (b) indication of the change in reflectivity while suppressing the effects of topography of the surface. | |
