The Effects of Collimation and Oblique Incidence in Length Interferometers. II.

Abstract

It is important in length determinations by interferometry to know the effect on the fringe pattern of an entrance aperture of finite size through which the light enters the interferometer. The correction generally applied has been found to be in error (Bruce 1955). This paper is a further discussion of this correction. Both two-beam and multiple-beam systems are discussed and show, in accordance with experiment, that the correction at present applied for the finite size of the aperture appears to be invalid.