Patent ID: 9036011
Filing Date: 2015-05-19
Classification: G01B,G01H

Abstract:
1. An image extraction method of optical phase extraction system comprising: irradiating a first optical path and a second optical path with light from a light source; modulating the light from the light source along the first optical path and the second optical path; directing a first modulated optical output signal along the first optical path into a measuring object and direct a reflected signal of the first modulated optical output signal to a coupler; directing a second modulated optical output signal along the second optical path as a reference signal to the coupler; obtaining an image of the object from an interference signal of the reflected signal and the reference signal from the coupler using an imaging device; checking whether a phase error due to an environmental disturbance of optical fiber occurs when a phase change exceeds a selected permissible error by monitoring an output signal obtained by interfering reflection optical signals reflected through the first optical path and the second optical path; compensating an error using a phase compensation control method of closed loop type through one of the first optical path and the second optical path when a phase error occurs; and extracting an image by capturing an image of the object in a state that the image of the object is shifted by the set phase value when a phase error is compensated.