Holographic displacement analysis using image-plane techniques

This paper explores the potential of using image-plane holography as a tool in experimental mechanics to determine both ‘in-plane’ and ‘out-of-plane’ displacement components. Collimated-illumination and telecentric-imaging project displacement along common-sensitivity vectors over the full-field while white-light reconstruction helps to reduce speckle noise which allows high-density fringe gradients of good quality to be recorded. A holographic-image-plane multiplexing arrangement is developed to record different displacement components on a single hologram. Experiments are designed so that both reconstruction and optical filtering can be performed without a major modification of optical components. Displacements obtained from a centrally loaded circularly clamped plate are compared to their theoretical counterparts. Results show that image-plane techniques offer many distinct advantages over conventional methods for holographic analysis of displacement on diffuse surfaces.

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