Patent ID: 6285456
Filing Date: 2001-09-04
Classification: G01B

Abstract:
An interferometer for measuring dimension of a work using laser light interference comprising;a laser light source,a white light source,a first optical assembly for introducing laser light from said laser light source onto a work and onto a first reference surface which acts as reference for laser light interference,a second optical assembly for introducing white light from said white light source onto a work and onto a second reference surface which acts as reference for white light interference,a work adjustment means for adjusting the slope of the work with respect to said first reference surface,an interference fringe detecting means for detecting laser light interference fringe generated by said first optical assembly and white light interference fringe generated by said second optical assembly, anda control means for controlling said first optical assembly, second optical assembly, work adjustment means, and interference fringe detecting means to successively perform a position adjustment of the work using laser light interference, preliminary measurement of the work using white light interference, and main measurement of the work using laser light.