Optical 3D Deformation Measurement System and its Application to Investigation of Mechanical Behaviors of Micro-Structure

Hongjian, 史红健 Shi; Hongwei, 计宏伟 Ji; Xiaoyuan, 何小元 He

doi:10.3788/aos201131.0312007

Cited by 2 publications

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“…Furthermore, the two techniques were implemented separately in the aforementioned study, and the interdependence between the in-plane and out-of-plane displacements was neglected, which restricted the ability to measure 3D rigid body displacement exclusively. Incorporating the four-step phase-shifting technique with DIC, Shi Hongjian [ 29 ] and co-researchers successfully investigated the profile and tensile strain of plastic sheets. The proposed method in this study demonstrated the efficacy of the four-step phase-shifting patterns that effectively eliminate the fringe pattern.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Shape and Deformation Measurements Based on Fringe Projection Profilometry and Fluorescent Digital Image Correlation via a 3 Charge Coupled Device Camera

Sun

Zhou

et al. 2023

Sensors

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We propose a novel hybrid FPP-DIC technique to measure an object’s shape and deformation in 3D simultaneously by using a single 3CCD color camera, which captures the blue fringe patterns and red fluorescent speckles within the same image. Firstly, red fluorescent speckles were painted on the surface of the specimen. Subsequently, 12 computer-generated blue fringe patterns with a black background were projected onto the surface of the specimen using a DLP projector. Finally, both the reference and deformed images with three different frequencies and four shifted phases were captured using a 3CCD camera. This technique employed a three-chip configuration in which red–green–blue chips were discretely integrated in the 3CCD color camera sensor, rendering independent capture of RGB information possible. Measurement of out-of-plane displacement was carried out through the implementation of Fringe Projection Profilometry (FPP), whereas the in-plane displacement was evaluated using a 2D Digital Image Correlation (DIC) method by leveraging a telecentric-lens-based optical system. In comparison to the traditional FPP-DIC hybrid methodology, the present approach showed a lower incidence of crosstalk between the fringe patterns and speckle patterns while also offering a corrective for the coupling of the in-plane displacement and out-of-plane displacement. Experimental results for the in-plane cantilever beam and out-of-plane disk comparisons with the traditional 3D-DIC method indicated that the maximum discrepancy obtained between FPP-DIC and 3D-DIC was 0.7 μm and 0.034 mm with different magnifications, respectively, validating the effectiveness and precision of the novel proposed FPP-DIC method.

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Section: Introductionmentioning

confidence: 99%

Three-Dimensional Shape and Deformation Measurements Based on Fringe Projection Profilometry and Fluorescent Digital Image Correlation via a 3 Charge Coupled Device Camera

Sun

Zhou

et al. 2023

Sensors

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光学显微镜图像恢复及在数字图像相关方法应变测量中的应用

Han Wei,

Wu Dan

2023

激光与光电子学进展

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As a direct and effective noncontact fullfield optical measurement method, the digital image correlation method has been widely used in 2D/3D displacement and strain measurements of materials and structures in various fields.Combined with advanced speckle preparation technology, in situ loading experiments are conducted under a microscope, which can realize the displacement and strain measurements of microscale digital image correlation. Outofplane displacement inevitably occurs in the loading process of specimens at the micro scale. Because of the limitations of the depth of field of optical microscopes, small outofplane displacement leads to defocus blurring of speckle images, which generates a corresponding error in deformation measurements. To reduce the error caused by outoffocus blur, the blind deconvolution method is used to blur the speckle image, and the Gaussian filtering method is used to denoise the speckle image to address noise problems. The effects of image restoration on the digital image correlation measurement accuracy are analyzed quantitatively, and a stretching experiment of an indium tin oxide (ITO) film is conducted. Experimental results show that the error in elastic modulus measurement after image restoration is reduced by 13. 91%, and the accuracy and stability of the strain measurement results are higher.

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Optical 3D Deformation Measurement System and its Application to Investigation of Mechanical Behaviors of Micro-Structure

Cited by 2 publications

References 0 publications

Three-Dimensional Shape and Deformation Measurements Based on Fringe Projection Profilometry and Fluorescent Digital Image Correlation via a 3 Charge Coupled Device Camera

Three-Dimensional Shape and Deformation Measurements Based on Fringe Projection Profilometry and Fluorescent Digital Image Correlation via a 3 Charge Coupled Device Camera

光学显微镜图像恢复及在数字图像相关方法应变测量中的应用

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