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Temporal Analysis of Speckle Images in Full-Field Interferometric and Camera-Based Optical Dynamic Measurement

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Publicado en:Photonics vol. 11, no. 6 (2024), p. 548
Autor principal: Bai, Guojun
Otros Autores: Wei, Yuchen, Chen, Bing, Fu, Yu
Publicado:
MDPI AG
Materias:
Signal processing
Digital imaging
Laser interferometry
Digital cameras
Wavelet transforms
High speed cameras
Fourier transforms
Vibration measurement
Lasers
Automotive engineering
Interferometry
Aerospace engineering
Measurement techniques
Digitization
Information processing
Algorithms
Dynamic characteristics
Deformation
Speckle interferometry
Vibration
Cameras
Acceso en línea:Citation/Abstract
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Resumen:Vibration measurement is crucial in fields like aviation, aerospace, and automotive engineering, which are trending towards larger, lighter, and more complex structures with increasingly complicated dynamics. Consequently, measuring a structure’s dynamic characteristics has gained heightened importance. Among non-contact approaches, those based on high-speed cameras combined with laser interferometry or computational imaging have gained widespread attention. These techniques yield sequences of images that form a three-dimensional space-time data set. Effectively processing these data is a prerequisite for accurately extracting dynamic deformation information. This paper presents two examples to illustrate the significant advantages of signal processing along the time axis in dynamic interferometric and digital speckle-image-based dynamic measurements. The results show that the temporal process effectively minimizes speckle and electronic noise in the spatial domain and dramatically increases measurement resolutions.
ISSN:2304-6732
DOI:10.3390/photonics11060548
Fuente:Advanced Technologies & Aerospace Database