&lt;title&gt;Computer-aided generation of speckle pattern in digital images&lt;/title&gt;

Matczak, Marek J.; Sokołowski, A.

doi:10.1117/12.195905

Cited by 2 publications

(1 citation statement)

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“…A flat-panel liquid crystal display (LCD), which is actually a cell phone screen in our case, with an effective size of 90 × 50 mm and a resolution of 1920 × 1080 pixels displays an image of a high-contrast speckle pattern generated with the algorithm from Ref. [31]. The SUT is a DM (OKO, 15-mm 37-channel MMDM) with a clear aperture of 15 mm driven by 37 channels of piezo actuators arranged in a circular manner.…”

Section: Methodsmentioning

confidence: 99%

Dynamic Deformation Measurement of Specular Surface with Deflectometry and Speckle Digital Image Correlation

Wang

Cheng

et al. 2020

Sensors

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The deformation measurement of a specular surface is of great importance during the quality inspection and installation of optical elements or wafers, especially those with large apertures. We propose a deflectometry method with speckle digital image correlation (DeSDIC) to realize the dynamic and high-accuracy measurement of the deformation on specular surfaces, with a simple system structure and robustness to noises and environmental vibrations. Random speckle pattern displayed on liquid crystal display is reflected by the original surface under test (SUT), and the distorted pattern is recorded by a camera. This originally distorted pattern is taken as the reference image, and the patterns captured afterwards are digitally correlated with the reference image to calculate the gradient change and deformation of the SUT. The theoretical relationships and an experimental one-step calibration scheme are proposed. Both static and dynamic deformations of a deformable mirror were experimentally measured to demonstrate the feasibility and accuracy of DeSDIC, which is comparable to phase-measuring deflectometry and interferometry.

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Section: Methodsmentioning

confidence: 99%