Abstract

A Michelson twin interferometer for phase-shifting measurement with a four-step interferometric method is described in this work. Two interference signals concerning measurement and reference beams are generated from a common optical system simultaneously. Although the interference signal of each beam changes over time, they have a synchronous relationship and the error component could be removed by taking the phase difference of the two beams even in the experimental environment without special temperature control and vibration-proofing equipment.

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