公开(公告)号：US20210231495A1

公开(公告)日：2021-07-29

申请号：US17056225

申请日：2019-05-17

Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN

Inventor： Steven T. CUNDIFF ,  Chris SMALLWOOD ,  Eric MARTIN

IPC: G01J3/02 ,  G01J3/45 ,  G01J9/02

Abstract: A method is presented for determining path length fluctuations in an interferometer using a reference laser with an arbitrary frequency with respect to the measured light. The method includes: injecting reference light along signal paths of the interferometer; measuring interference between the reference light at an output of the interferometer; determining an optical phase difference between the reference light in the two signal paths of the interferometer by measuring intensity modulation of the interference between the reference light and subtracting an intended frequency modulation from the measured intensity modulation; accumulating an unwrapped phase difference between the reference light in the two signal paths of the interferometer, where the unwrapped phase difference is defined in relation to a reference; and determining path length fluctuation of light in the interferometer using the unwrapped phase difference.