Use of Moiré fringes in digital holography for optical alignment

Yihan Liu; Partha Banerjee

doi:10.1117/12.2570484

21 August 2020 Use of Moiré fringes in digital holography for optical alignment

Yihan Liu, Partha Banerjee

Proceedings Volume 11490, Interferometry XX; 114900R (2020) https://doi.org/10.1117/12.2570484
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Moiré fringes may be encountered in digital holography when the local fringe period is comparable to the pixel separation of the recording CCD array. In this work, we demonstrate the relation between the transverse misalignment of a lens used in an inline digital holographic system using CW illumination with the position of Moiré pattern on the recording CCD plane. A test object such as a one-dimensional opaque block is used along with a single lens imaging system, and the CCD plane is assumed to be in the far-field of the image plane. Our preliminary results show that small transverse misalignments can be tracked by monitoring the location of the Moiré pattern. It is proposed that Moiré patterns can be used to detect and correct optical misalignments in more complex optical systems.

Conference Presentation

Citation Download Citation

Yihan Liu and Partha Banerjee "Use of Moiré fringes in digital holography for optical alignment", Proc. SPIE 11490, Interferometry XX, 114900R (21 August 2020); https://doi.org/10.1117/12.2570484

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