NONLINEAR ERROR CORRECTION METHOD FOR OPTICAL FIBER MICHELSON INTERFEROMETER

摘要

A nonlinear error correction method for an optical fiber Michelson interferometer, relating to the technical field of optical fiber interferometry. In the present invention, without needing to change the positions of a first reflector and a second reflector, wavelength pre-scanning is performed on a laser wavelength modulated light source; a continuous variation in the optical path difference between a reference beam and a measurement beam of the interferometer is generated using the continuous output laser wavelength variation to generate at least one cycle of phase change in an interference signal obtained by a detector, so as to implement the pre-extraction of characteristic parameters of the interference signal; and the pre-extracted characteristic parameters are used to implement the nonlinear error correction and carry out a high-precision displacement measurement during the measurement process. The present invention achieves the pre-extraction of the characteristic parameters of the interference signal of the optical fiber Michelson interferometer, can effectively solve the problem of nonlinear error correction in the interferometry, especially in the measurement of small displacement, and has significant technical advantages in the field of precision measurement.