Method and Apparatus for Rapid Optical Phasing.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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This document discloses a method and apparatus for rapid optical phasing of optical devices utilizing white light interference fringe finding. The apparatus comprises a white light source, a beam splitter, a scanning mirror and a stationary reflective surface. The scanning mirror is moved in piston while reflected light is observed by an electro optic sensor at a receiver. A nulled pattern has been previously established at the receiver. An electrical signal from the electro optic sensor is mounted at amplification and recording means to identify variations in reflected light intensity that are caused by white light fringes. White light fringes only occur at zero optical difference, i.e. when the scanning mirror and stationary reflective surface are in phase.