Holographic Interferometry

This book provides a rigorous examination of Holographic Interferometry (HI), positioning it as a superior alternative to conventional metrology for high-precision, non-destructive analysis. The text begins by establishing the foundational physics of holography, utilizing the recording and reconstruction equations to explain how both the amplitude and phase of a light wave are captured. By detailing the essential roles of temporal and spatial coherence, and providing detailed schematics for recording setups, the book clarifies the complex interaction between the object and reference beams. This theoretical groundwork serves as the springboard for exploring primary HI modalities-including double-exposure, real-time, and time-average techniques-which allow for the visualization of sub-wavelength displacements and vibrations in diffuse objects. Moving into modern advancements, the book transitions into Digital Holographic Interferometry (DHI), where traditional photochemical processes are replaced by electronic sensors and numerical reconstruction algorithms.