The precision and accuracy of interferometers using quadrature fringe detection are often limited not by the interferometer itself but by the detector system. There are three typical errors: unequal gain in the two channels; quadrature phase shift error; and zero offsets. This paper describes a simple method for determining the quadrature errors from experimental data obtained in the interferometer and correcting for them. A numerical example demonstrating the significant improvement in the precision of interferometer data is given.
© 1981 Optical Society of America
Original Manuscript: May 16, 1981
Published: October 1, 1981
Peter L. M. Heydemann, "Determination and correction of quadrature fringe measurement errors in interferometers," Appl. Opt. 20, 3382-3384 (1981)