Interferometer arrangement with adjustable optical path length difference for detecting a distance between different layers of an eye

摘要

An interferometer arrangement has an adjustable optical path length difference in at least one interferometer arm and a photoelectric receiver for detecting the interference signals generated by the interferometer. An incremental grating transmitter is coupled to the arrangement with a device for changing the optical path length difference and for generating a reference signal which changes its frequency like that of the interference signal depending on the rate of change of the optical path difference.