Optimization of multiscale digital speckle patterns for multiscale deformation measurement using stereo-digital image correlation

Zhenning Chen; Xinxing Shao; Wei Sun; Jie Zhao; Xiaoyuan He

doi:10.1364/AO.423350

Applied Optics
Vol. 60,
Issue 16,
pp. 4680-4689
(2021)
•https://doi.org/10.1364/AO.423350

Optimization of multiscale digital speckle patterns for multiscale deformation measurement using stereo-digital image correlation

Zhenning Chen, Xinxing Shao, Wei Sun, Jie Zhao, and Xiaoyuan He

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Zhenning Chen, Xinxing Shao, Wei Sun, Jie Zhao, and Xiaoyuan He, "Optimization of multiscale digital speckle patterns for multiscale deformation measurement using stereo-digital image correlation," Appl. Opt. 60, 4680-4689 (2021)

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Abstract

Simultaneous monitoring of multiple fields of view (FOVs) by multiscale stereo-digital image correlation (stereo-DIC) can quantify the deformation of a material when localized phenomena occur within a larger FOV or moving object. In multiscale deformation measurement via stereo-DIC, optimization of the digital speckle patterns (DSPs) is essential to achieve high accuracy and efficiency. This work optimizes and fabricates multispectral DSPs used for multiple scales. First, an optimization of the DSP for two FOVs is achieved using both spatial modulation and specified spectra. A spatially modulated DSP is compared with two spectral DSPs achieved by visible and ultraviolet-excited blue light. Then, a spatially modulated visible DSP fabricated by an ultraviolet printer overlaid with an ultraviolet-excited blue DSP fabricated by a photosensitive seal is designed for multiscale stereo-DIC measurements of three FOVs. Experiments were performed to illustrate the functionality and utility of this multiscale DSP. Such experimental analyses can supply adequate full-field data to validate localized or kinetic mechanical behavior.

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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	Red DSP on the Top	Red DSP on the Bottom	Blue DSP on the Bottom	Blue DSP on the Top
Accuracy (RMSE)	$0.004 \pm 0.002$	$0.005 \pm 0.002$	$0.007 \pm 0.003$	$0.0024 \pm 0.0009$
Efficiency (iteration times)	$2.32 \pm 0.47$	$2.03 \pm 0.17$	$2.16 \pm 0.37$	$2.83 \pm 0.43$

	Small FOV	Medium FOV	Large FOV
Speckle details
Accuracy (RMSE)	$0.0023 \pm 0.0007$	$0.0056 \pm 0.0018$	$0.011 \pm 0.005$
Efficiency (iterative times)	$2.47 \pm 0.51$	$2.67 \pm 0.55$	$2.57 \pm 0.49$

	Red DSP on the Top	Red DSP on the Bottom	Blue DSP on the Bottom	Blue DSP on the Top
Accuracy (RMSE)	$0.004 \pm 0.002$	$0.005 \pm 0.002$	$0.007 \pm 0.003$	$0.0024 \pm 0.0009$
Efficiency (iteration times)	$2.32 \pm 0.47$	$2.03 \pm 0.17$	$2.16 \pm 0.37$	$2.83 \pm 0.43$

	Small FOV	Medium FOV	Large FOV
Speckle details
Accuracy (RMSE)	$0.0023 \pm 0.0007$	$0.0056 \pm 0.0018$	$0.011 \pm 0.005$
Efficiency (iterative times)	$2.47 \pm 0.51$	$2.67 \pm 0.55$	$2.57 \pm 0.49$

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Applied Optics