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Acta Optica Sinica, Volume. 42, Issue 13, 1315001(2022)

Biaxial Three-Dimensional Video Extensometer Based on Single-Camera Four-View Imaging

Kuangda Wu, Jingye Qu, Xinxing Shao^*, and Xiaoyuan He

Author Affiliations

Department of Engineering Mechanics, School of Civil Engineering, Southeast University, Nanjing 210018, Jiangsu , China

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Abstract Get PDF(in Chinese)

Figures&Tables (13)

References (22)

Paper Information

Figures & Tables(13)

Fig. 1. Schematic diagram of four-prism imaging optical path

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Fig. 2. Basic schematic diagram of four-view stereo vision

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Fig. 3. Schematic diagram of biaxial three-dimensional video extensometer

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Fig. 4. Stainless steel tensile specimen

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Fig. 5. Device drawing of metal material tensile experiment

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Fig. 6. Gauge length of biaxial three-dimensional video extensometer

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Fig. 7. Absolute error of strain measurement by biaxial three-dimensional video extensometer. (a) X direction; (b) Y direction

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Fig. 8. Stress-strain curve in Y direction

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Fig. 9. Strain curve in X-Y direction

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Fig. 10. Comparison of absolute error between two-view and four-view video extensometers. (a) Strain in X direction; (b) strain in Y direction

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Table 1. Maximum absolute error in three groups of experiments after average denoising
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Table 1. Maximum absolute error in three groups of experiments after average denoising
Group No. X direction / $μ ε$ Y direction / $μ ε$
1 13.0 17.0
2 22.5 18.1
3 27.3 23.5

Table 2. Strain in Y direction
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Table 2. Strain in Y direction
Load /kN Absolute error / $μ ε$ Relative error /%
0.26 - -
0.84 -4.86 4.58
1.35 -11.42 5.68
1.89 -5.98 1.99
2.43 -10.82 2.69
2.96 -0.06 0.01
3.48 17.61 -2.91
4.03 5.75 -0.81
4.55 -3.76 0.47
4.94 -3.45 0.38
5.32 -4.32 0.43

Table 3. Strain in X direction
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Table 3. Strain in X direction
Load /kN Absolute error / $μ ε$ Relative error /%
0.26 - -
0.84 4.02 13.86
1.35 4.81 8.91
1.89 4.44 5.48
2.43 0.55 0.51
2.96 1.10 0.81
3.48 -13.05 -7.96
4.03 -8.64 -4.43
4.55 -2.62 -1.18
4.94 6.21 2.52
5.32 -2.45 -0.90

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Kuangda Wu, Jingye Qu, Xinxing Shao, Xiaoyuan He. Biaxial Three-Dimensional Video Extensometer Based on Single-Camera Four-View Imaging[J]. Acta Optica Sinica, 2022, 42(13): 1315001

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Paper Information

Category: Machine Vision

Received: Oct. 8, 2021

Accepted: Dec. 27, 2021

Published Online: Jul. 15, 2022

The Author Email: Shao Xinxing (xinxing.shao@seu.edu.cn)

DOI:10.3788/AOS202242.1315001

Topics

laser devices and laser physics

Lasers and Laser Optics

laser manufacturing

Instrumentation, Measurement and Metrology