Patent ID: 6108079
Filing Date: 2000-08-22
Classification: G01N,H01L

Abstract:
A crystal defect measurement method for measuring an inner defect of sample, by letting light beams come in slantingly to a surface of the sample being moved, said light beams having two wavelengths and penetration depths thereof to the sample being different, and by detecting scattering lights having said two wavelengths generated from interior of said sample with an detection optical system arranged upward of said surface, said crystal defect measurement method comprising the steps of:measuring a height of said surface with a distance measurement means of an electrostatic capacitance type arranged to be upstream in a moving direction of the sample from said irradiation optical system and said detection optical system, andcontrolling a height position of said irradiation optical system and said detection optical system to said sample, so that said irradiation optical system and said detection optical system are disposed at a predetermined position with respect to a measuring point on said sample, when said measuring point on said sample measured by said distance measurement means arrives below said detection optical system.