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.
| Original language | English |
|---|---|
| Pages (from-to) | 4742-4745 |
| Number of pages | 4 |
| Journal | Optics Letters |
| Volume | 47 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - 2022 |
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-careOtherwise 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.