Influence of in-plane displacement and double-aperture orientation on slope fringe formation in double-shearing-aperture speckle interferometry

The influence of the in-plane displacement and double-aperture orientation on the slope fringe formation in double-shearing-aperture speckle interfero metry is discussed in detail. The research results show that the two in-pla ne displacement components, one parallel to and the other perpendicular to the shearing direction, have an influence on the slope fringe formation and that the double-aperture orientation also has an important influence on th e slope fringe formation. A theoretical analysis and experimental results a re presented. The experimental results are in good agreement with the theor etical analysis. (C) 2000 Society of Photo-Optical Instrumentation Engineer s.