Patent ID: 7440112
Filing Date: 2008-10-21
Classification: A61B,G01B

Abstract:
1. A method for shape measurement comprising the steps of: generating a frequency COMB light by inputting a laser light from a laser light source into an optical fiber which compensates a change in the polarization condition and maintains the polarization, and has a first mirror and a second mirror which are positioned with a resonant distance in between and modulating the laser light transmitting between the first mirror and the second mirror using a modulation electrode; and measuring a shape of an measured object using an optical interferometer by inputting the frequency COMB light into the optical interferometer for distance measurement, wherein further comprising the step of: regulating an observation depth by varying the modulation signal applied to the modulation electrode so that a frequency pitch of frequency COMBs which constitutes the frequency COMB light is varied.