Patent ID: 6906809
Filing Date: 2005-06-14
Classification: G01B

Abstract:
1. A surface shape measuring system characterized by comprising: an optical element for formation of contour line fringes which is disposed to face a measurement target surface of a measurement target object; a light source which irradiates said optical element with illumination light; a camera which captures an image of the contour line fringes formed on said optical element by light passing through said optical element and reflected by the measurement target surface; moving means for changing a distance between said optical element and the measurement target surface; and analyzing means for performing an analysis process of obtaining 3-D shape information of the measurement target surface from an image picked up by said camera in at least two cases in which the distance is set to different values, and obtaining true 3-D shape information from which a measurement error caused by an inclination of the measurement target surface is eliminated, on the basis of the 3-D shape information in each of the cases and the distance.