Abstract

This paper reviews progress in the techniques of calibration of scales and line standards by interferometry, techniques that have been under very active development since the redefinition of the meter in terms of an optical wavelength. After a study of some general considerations, specific examples of interference comparators are described, and, finally, the effect of the development of these techniques on the usefulness of scales as secondary standards is discussed.

© 1963 Optical Society of America

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