Speckle noise suppression of digital holographic microscopy with diffusion glass rotation

Bingcai Liu; Rui Niu; Ailing Tian; Hongjun Wang; Xueliang Zhu; Yuanyi Wang

doi:10.1117/12.2605353

13 December 2021 Speckle noise suppression of digital holographic microscopy with diffusion glass rotation

Bingcai Liu, Rui Niu, Ailing Tian, Hongjun Wang, Xueliang Zhu, Yuanyi Wang

Proceedings Volume 12071, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing and Metrology Technologies; 120710O (2021) https://doi.org/10.1117/12.2605353
Event: Tenth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2021), 2021, Chengdu, China

Abstract

Digital holographic microscopy is an ideal non-invasive, non-contact, and fast-response 3D measurement method. The strong coherence of the laser leads to irregularly distributed speckle noise during the digital holographic recording process, which affects the 3D reconstruction of the digital holographic microscopy system. To solve this problem, the coherence of the laser is changed by diffusion glass rotation to achieve the suppression of the speckle noise in the digital holographic measurement system. Firstly, a theoretical model of a digital holographic microscopy system based on the diffusion glass rotation is established. Then, the influence of diffusion glass rotation speed on coherence time, speckle contrast, fringe contrast, signal-to-noise ratio are simulated and analyzed, the optimal rotation speed of the digital holographic microscopy system is obtained. Finally, The speckle noise suppression system based on the Mach-Zehnder interference model is established, and the optimal parameters of the diffusion glass rotation are set, which verifies that the method is suitable for high-precision measurement.

Citation Download Citation

Bingcai Liu, Rui Niu, Ailing Tian, Hongjun Wang, Xueliang Zhu, and Yuanyi Wang "Speckle noise suppression of digital holographic microscopy with diffusion glass rotation", Proc. SPIE 12071, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing and Metrology Technologies, 120710O (13 December 2021); https://doi.org/10.1117/12.2605353

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KEYWORDS

Speckle

Signal to noise ratio

Digital holography

Holography

Holograms

Diffusion

Glasses

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