Application of shear interferometry to control the angular displacement of an object's surface

The present work is devoted to the study of an interference control system for the angular displacement of object surface points on high-resolution holographic plates. Holographic interferometry methods are highly accurate and highly informative measurement methods and make it possible to study processes both in statics and dynamics, can examine highly polished and rough surfaces (of the first and second roughness classes), monitor wave fields that existed at different times, and obtain experimental data in quantitative and qualitative aspects. The paper evaluates the pitch of interference fringes for measurements, suggests a method for eliminating inclined surface displacements, and provides a functional diagram of the developed device. The expression is obtained for interference fringes distinguishable against the background of optical noise for conducting a real experiment.