Patent ID: 7245383
Filing Date: 2007-07-17
Classification: G01B,G01J

Abstract:
1. An optical image measuring apparatus for forming an image of an object to be measured based on interference light, comprising: a light source for emitting a light beam; an optical interference system that divides the light beam emitted from the light source into signal light propagating through the object to be measured and reference light propagating through a predetermined reference object, shifts a frequency of the signal light and a frequency of the reference light relative to each other, and then superimposes the signal light propagating through the object to be measured and the reference light propagating through the predetermined reference object on each other to produce the interference light; sampling means for dividing the interference light produced by the optical interference system into at least three interference light beams, sampling at least the three interference light beams at predetermined intervals, and outputting the sampled interference light beams as electrical signals; and calculation means for calculating a signal intensity of the interference light and a spatial phase distribution thereof based on the electrical signals outputted from the sampling means.