Print Email Facebook Twitter Mitigating speckle noise in a laser Doppler vibrometer using Fourier analysis Title Mitigating speckle noise in a laser Doppler vibrometer using Fourier analysis Author Jin, J. (TU Delft Railway Engineering) Li, Z. (TU Delft Railway Engineering) Date 2022 Abstract We propose two strategies for eliminating the speckle noise in a laser Doppler vibrometer according to Fourier analysis. Fourier transform is theoretically conducted on the speckle pattern phases, whose variation dominantly contributes to the speckle noise. The calculated and experimental frequency spectra of speckle noise both present oscillations of the frequency series (frequency peaks have constant intervals). (1) A low-pass filter can remove the noise if the vibration frequency is far lower than the first frequency peak of the noise. (2) The vibration energy can be revealed by removing the oscillating frequency trend. Physical experiments demonstrate the effectiveness of both despeckling strategies. To reference this document use: http://resolver.tudelft.nl/uuid:cb8cbd52-22cc-45f4-b985-99ca348d3ae9 DOI https://doi.org/10.1364/OL.456040 Embargo date 2023-07-01 ISSN 0146-9592 Source Optics Letters, 47 (18), 4742-4745 Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2022 J. Jin, Z. Li Files PDF ol_47_18_4742.pdf 2.84 MB Close viewer /islandora/object/uuid:cb8cbd52-22cc-45f4-b985-99ca348d3ae9/datastream/OBJ/view