Patent ID: 6020965
Filing Date: 2000-02-01
Classification: G01B

Abstract:
A phase interference microscope, comprising:a light source for emitting coherent light with a constant wavelength;an interference optical system for splitting the light emitted from said light source into first and second light beams, irradiating the first light beam onto a sample and the second light beam onto a reference mirror, the first light beam reflecting off the sample and the second light beam reflecting off the reference mirror, and making the first light beam reflected off said sample interfere with the second light beam reflected off said reference mirror;a focusing device for recognizing a position of a middle point in a phase anomaly of interference light generated in the vicinity of a focusing point as a focusing point for said sample, and moving said sample to said focusing position; anda size measurement device for measuring a size of said sample on the basis of said interference light.