Abstract: An optical pattern that is to be supported for examination is formed on a surface of a substrate, generally glass. Corner brackets are fixedly mounted on the substrate. Each of the corner brackets has a support portion and a housing that mounts a locating ball or sphere that protrudes out of the housing. The housing is connected to the support portion of the respective bracket through a flexure hinge that permits movement of the housing and supported ball in a plane generally parallel to the surface of the substrate having the optical pattern.

Abstract: An adapter for mounting on an interferometer to provide a phase shift of the reference transmission sphere or flat used on the output of the interferometer is made of a monolithic body separated into two portions. The first portion is a fixed end support portion that mounts on the interferometer, and the second portion is a movable end support portion that mounts the sphere or flat that is used for transmission of the optic beam. The movable end support portion is mounted and the fixed end support portion are connected through flexure hinges that permit axial movement between the support portions, and a single actuator can be used between the support portions for causing axial movement. The flexure hinges are located so the adapter is very stiff against all motions except axial motions.