METHOD FOR IMAGE RANGE EXTENSION IN OPTICAL COHERENCE TOMOGRAPHY

摘要

A method of generating a tomogram of a sample (18) wherein an analysis beam (Ed) is subject to dispersion distortion, the method comprising: a) detecting the analysis beam (Ed) b) generating a signal (s) representative of the intensity of wavelengths in the analysis beam (Ed); c) generating (46, 48) a first spatial domain signal (S) representative of the signal (s) so generated; d) detecting (50) a desired signal component of the first spatial domain signal (S) and outputting (70) the desired signal component for use in generating a depth scan which can be used to create a line of the tomogram; e) subtracting (52) the desired signal component from the first spatial domain signal (S) to generate a second spatial domain signal (S -); f) generating (54, 56, 58, 60) an intermediate signal (S+) which does not include the desired signal component, and g) calculating (62) the complex conjugate of the desired signal component in the first spatial domain signal (S), subtracting (64) it from the intermediate signal (S+) and creating (66, 68) a signal (s') from which a new first spatial domain signal (S) can be generated for use in steps c) to g).