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Journal Article
Noise analysis in outdoor dynamic speckle measurement
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- Authors
- Mikhail Levchenko, Elena Stoykova, Branimir Ivanov, Lian Nedelchev, Dimana Nazarova, Kihong Choi, Joongki Park
- Issue Date
- 2023-04
- Citation
- Applied Optics, v.62, no.10, pp.D187-D195
- ISSN
- 1559-128X
- Publisher
- Optical Society of America (OSA)
- Language
- English
- Type
- Journal Article
- Abstract
- The dynamic speckle method (DSM) is an effective tool for the estimation of speed of processes. The speed distribution is encoded in a map built by statistical pointwise processing of time-correlated speckle patterns. For industrial inspection, the outdoor noisy measurement is required. The paper analyzes the efficiency of the DSM in the presence of environmental noise as phase fluctuations due to the lack of vibration isolation and shot noise due to ambient light. The usage of normalized estimates for the case of non-uniform laser illumination is studied. The feasibility of the outdoor measurement has been proven by numerical simulations of noisy image capture and real experiments with test objects. Good agreement has been demonstrated in both the simulation and experiment between the ground truth map and the maps extracted from noisy data.
- KSP Keywords
- Ambient light, Dynamic speckle, Environmental noise, Ground Truth, Image capture, Industrial inspection, Noisy measurements, Non-uniform, Normalized estimates, Numerical simulation(Trnsys16), Phase fluctuation