| 摘要 |
<p>At least three detectors disposed on a line perpendicular to a straight line fringe pattern and on centers at one-fourth the fringe period provide signals indicative of the intensities of the pattern incident on them. The signals are manipulated to render equal the fringe intensity terms of the expressions from the sinusoidally varying signals as part of the procedure for deriving the phase value. Derivation of the phase value is a step in derivation of displacement. The fringes are created in an interferometric device or from a sinusoidally varying grating.</p> |
