Three-dimensional profile measurement of the blade based on surface structured light

Fu, Yanjun; Wang, Yong-Long; Wan, Meiting; Wang, Wei

doi:10.1016/j.ijleo.2012.10.003

Cited by 19 publications

(4 citation statements)

References 9 publications

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“…A simple and widely used type of three-dimensional scanning techniques is the structured light scanning. Structured light scanners project a two-dimensional banded pattern, such as narrow linear stripes, on the three-dimensional target surface in a specific frequency of light [28]. One or more cameras are then used to view the surface at an oblique angle.…”

Section: Geometric Data Acquisition Using Structured Light Scanningmentioning

confidence: 99%

Nonlinear dynamic analysis of parabolic leaf springs using ANCF geometry and data acquisition

et al. 2018

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The parabolic leaf spring is widely used in modern vehicle suspension systems because it has many desirable features, such as weak interleaf friction and light weight. In this paper, the parabolic leaf spring is analyzed using automatic geometric data acquisition (AGDA) and the finite element (FE) absolute nodal coordinate formulation (ANCF). In order to account for manufacturing considerations in developing the virtual models, the relaxed uniform cubic B-Spline is used to represent the leaf spring profile curves and geometry. Three-dimensional scanning techniques based on structured light and multiple images are explored in this study to automatically extract the leaf spring complex geometric data. A new procedure is proposed to develop the ANCF/FE mesh from the physical object. Both double-leaf uniform-thickness and double-leaf parabolic spring models are developed and analyzed using different ANCF elements. Using ANCF geometry, piecewise linearly tapered parabolic leaf spring models are constructed, accounting for the leaf pre-stress. The interleaf contact is enforced using a penalty approach and a smoothed Coulomb friction model. It is shown that the fully-parameterized low-order beam and plate elements suffer from locking problems, while the thin plate element can lead to less accurate results. The use of the new strain-split method (SSM) as a locking alleviation technique is also examined in this investigation. It is shown that while the current SSM implementation can be effective in solving the locking problem in the case of symmetric bending-dominant loading, it may not produce accurate results in the case of torsional loading. The comparative study performed demonstrates that the higher order ANCF beam element is more suitable for developing the leaf spring models compared to other ANCF elements considered in this investigation. The numerical results obtained show that the friction effect in parabolic leaf springs is much weaker than that in the leaf spring with uniform-thickness.

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Section: Geometric Data Acquisition Using Structured Light Scanningmentioning

confidence: 99%

Nonlinear dynamic analysis of parabolic leaf springs using ANCF geometry and data acquisition

et al. 2018

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“…For testing large aperture optical devices, the limitations of non-optical methods are their nonlinearity and narrow dynamic range; thus, they do not meet the requirements of surface shape measurement. Optical methods mainly include confocal microscopy [4], structured light microscopy [5], and optical interferometry [6][7][8][9][10][11][12][13][14][15]. Optical interferometry outperforms other methods not only because it is a non-contact measurement method but because optical interferometry has a broad measurement range.…”

Section: Introductionmentioning

confidence: 99%

Precise Measurement of the Surface Shape of Silicon Wafer by Using a New Phase-Shifting Algorithm and Wavelength-Tuning Interferometer

2020

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In wavelength-tuning interferometry, the surface profile of the optical component is a key evaluation index. However, the systematic errors caused by the coupling error between the higher harmonics and phase shift error are considerable. In this research, a new 10N − 9 phase-shifting algorithm comprising a new polynomial window function and a DFT is developed. A new polynomial window function is developed based on characteristic polynomial theory. The characteristic of the new 10N − 9 algorithm is represented in the frequency domain by Fourier description. The phase error of the new algorithm is also discussed and compared with other phase-shifting algorithms. The surface profile of a silicon wafer was measured by using the 10N − 9 algorithm and a wavelength-tuning interferometer. The repeatability measurement error across 20 experiments was 2.045 nm, which indicates that the new 10N − 9 algorithm outperforms the conventional phase-shifting algorithm.

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“…This technique not only produces more codewords but also receives more robust measurement results for different fringe image brightness levels compared with Gray code techniques. Fu et al [17] followed Wang's theory and measured a blade with a complex shape. However, the measurement accuracy was reduced when numerous codewords were adopted.…”

Section: Introductionmentioning

confidence: 99%

Stair phase-coding fringe plus phase-shifting used in 3D measuring profilometry

Zeng

et al. 2016

J. Eur. Opt. Soc.-Rapid Publ.

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As the number of codewords adopted in phase-coding fringes increases, the solution of fringe orders leads to many mistakes. Consequently, errors of the unwrapped phase occur. Thus, increasing the codeword approach in a phase-coding fringe remains a challenge. In this paper, a modified stair phase-coding fringe is designed, and a new phase unwrapping algorithm based on shifting fringe order is presented. The main idea of this method is that the width ratio between the sinusoidal fringe and each stair phase of phase-coding fringe is set to 1: n. The fringe order retrieved from the phase-coding fringe can be multiplied by the shift itself, thereby assisting phase unwrapping. This method adopts fewer codewords to replace the usual large number. As such, the approach gains two merits. One is that it guarantees a high measurement accuracy. The other is that it allows the measurement of isolated objects with complicated shapes. The experiments demonstrate that the proposed method is simple but effective.

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Three-dimensional profile measurement of the blade based on surface structured light

Cited by 19 publications

References 9 publications

Nonlinear dynamic analysis of parabolic leaf springs using ANCF geometry and data acquisition

Nonlinear dynamic analysis of parabolic leaf springs using ANCF geometry and data acquisition

Precise Measurement of the Surface Shape of Silicon Wafer by Using a New Phase-Shifting Algorithm and Wavelength-Tuning Interferometer

Stair phase-coding fringe plus phase-shifting used in 3D measuring profilometry

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