Nanoscale surface topography using low-cost digital holographic microscopy

Dhruvam Pandey; Subrahmanya K. N.; Rajshekhar Gannavarapu

doi:10.1117/12.2672530

15 August 2023 Nanoscale surface topography using low-cost digital holographic microscopy

Dhruvam Pandey, Subrahmanya K. N., Rajshekhar Gannavarapu

Proceedings Volume 12618, Optical Measurement Systems for Industrial Inspection XIII; 126180Z (2023) https://doi.org/10.1117/12.2672530
Event: SPIE Optical Metrology, 2023, Munich, Germany

Conference Poster

Abstract

In this article, a reliable method for surface topography is proposed employing a digital holographic microscopy setup. The proposed method is based on extracting the surface profile from the phase map encoded in the hologram signal. For hologram acquisition and reconstruction, we used a Raspberry Pi computer and camera module in our experimental setup, which is a step toward low-cost non-contact surface profilometry. A graphics processing unit (GPU) assisted state space method is used for rapid and reliable phase estimation, providing high robustness against noise. The experimental finding for a standard calibration target corroborates the practical viability of the proposed method.

Conference Presentation

Citation Download Citation

Dhruvam Pandey, Subrahmanya K. N., and Rajshekhar Gannavarapu "Nanoscale surface topography using low-cost digital holographic microscopy", Proc. SPIE 12618, Optical Measurement Systems for Industrial Inspection XIII, 126180Z (15 August 2023); https://doi.org/10.1117/12.2672530

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