System based on OCT formation of image degree of depth is extended to double space carrier frequency technique

The utility model discloses a system based on OCT formation of image degree of depth is extended to double space carrier frequency technique. Set up two reference arm that have different optical distances in the OCT system of fourier territory, the sample light signal with different depth position takes place to interfere respectively. Set up one set of scanning galvanometer system separately in two reference arm, make the incoming position of light beam on the scanning galvanometer among two reference arm have different offsets for the rotation axis of scanning galvanometer. Make the scanning galvanometer synchronized sweep among sample arm and two reference arm through the synchro control circuit. Because the space phase modulating action of scanning galvanometer among two reference arm makes the interference spectral signature corresponding to two depth position in the sample arrived different horizontal spatial frequency spectrum frequency bands by the loading respectively. Interfere spectral signature to carry out the demodulation through the computer to the modulation that detects and handle, acquire two frames and corresponding to the different depth position's of sample OCT image, can realize the expansion at double of the OCT formation of image degree of depth then through simple concatenation.