Method and apparatus for monitoring the surface profile of a mov

Details Method and apparatus for monitoring the surface profile of a mov Method and apparatus for monitoring the surface profile of a mov

1989-02-06

1991-10-15

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

356 1, G01B 1124

Patent

active

050569228

ABSTRACT:
An optical inspecting apparatus and the method thereof, including a series of optical units for rapidly acquiring the three-dimensional surface profile of a moving object. Each optical unit contains a multiple-beam light source to project a number of luminous spots on the object surface which are imaged through a properly oriented line-array camera. The surface position on both sides of the object, and thus the object thickness, is inferred at the position of each luminous spot from an analysis of their camera image. The projected luminous spots are preferably elliptically shaped and the line array elements are elongated in a direction perpendicular to their longitudinal axis in order to reduce speckle and other optical noise. The described optical configuration results in a superior performance in terms of spatial resolution and response speed.

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Cielo, P., and Lamontagne, M., "Improvement of Subpixel Resolution in Triangulation Ranging by Astigmatic Spot Projection and Wide-Aperture Line Array Imaging," Optics and Laser Technology, vol. 20, pp. 19-24.

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