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@article{187931,
        author = {Asghar khan and Arasad Ali Khan and H. L. Yadav},
        title = {Experimental Analysis and Evaluation of Single Aperture and Double Aperture Compact Holographic Imaging Configurations for In-Plane Displacement Measurement in Speckle Metrology},
        journal = {International Journal of Innovative Research in Technology},
        year = {2025},
        volume = {12},
        number = {7},
        pages = {124-130},
        issn = {2349-6002},
        url = {https://ijirt.org/article?manuscript=187931},
        abstract = {In this work, a comparative experimental analysis of single-aperture and double-aperture compact holographic imaging systems to measure in-plane displacement components in speckle metrology has been presented. The single-aperture configuration uses two identical holographic lenses for speckle photography, while the double-aperture configuration employs four identical holographic lenses for speckle interferometry for diffraction-limited imaging performance almost free of all monochromatic aberrations. Further, to achieve on-axis imaging performance, holographic lenses have been recorded in different recording geometries for single-aperture and double-aperture configurations. Typically, in these imaging configurations, the holographic lenses are placed at a distance equal to the sum of their focal lengths, in accordance with Fourier theory. Experiments have been performed to demonstrate that the separation between the holographic lenses of the imaging systems has no marked effect on the measurement of in-plane displacement components. The results of measuring in-plane displacement components for both imaging configurations are presented. The obtained results approximately match the actual displacement applied between the two exposures. Based on the experiments, it is observed that a compact arrangement of holographic lenses in these configurations provides ease of experimentation, and problems arising due to system bulkiness and lens alignment can be resolved. Additionally, the probability of occurring aberrations due to the slight misalignment of holographic lenses can be avoided by using holographic lenses in a compact arrangement.},
        keywords = {Holographic Lens, In-plane Displacement, Speckle Photography.},
        month = {November},
        }