Application of Moire Profilometry in Three-Dimensional Profile Reconstruction of Key Parts in Railway

Ma, Ruyu; Li, Jinlong; He, Kailang; Tang, Tengfeng; Gao, Xiaorong

doi:10.3390/s22072498

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…There are growing demands and applications for fringe projection profilometry in the field of precise three-dimensional (3D) shape measurement [1][2][3][4][5][6]. A typical monocular fringe profile projection system consists of a projector and a camera.…”

Section: Introductionmentioning

confidence: 99%

An Optimized Error Compensation Method for Phase Measurement Profilometry

Guo,

Xu,

Zhang

et al. 2023

Photonics

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Phase measurement profilometry (PMP) is primarily employed to analyze the morphology of a functional surface with precision. Historically, one of the most complex and persistent challenges in PMP has been reducing errors stemming from inconsistent indicators at the edges of a surface. In response to this challenge, we propose an optimized error compensation methodology specifically designed to handle edge artefacts. This methodology introduces the Hilbert transform and object surface albedo as tools to detect the edges of the artefact region that need to be compensated. Moreover, we analyze the characteristics of the sinusoidal fringe waveform propagation direction and investigate the reconstruction results of the fringe vertical to the current directions to compensate for edge artefacts. The experimental results for various objects show that the optimized approach can compensate for edge artefacts by projecting in two directions and reducing the projection by half. The compensated root mean square error (RMSE) for planar objects can be reduced by over 45%.

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Section: Introductionmentioning

confidence: 99%

An Optimized Error Compensation Method for Phase Measurement Profilometry

Guo,

Xu,

Zhang

et al. 2023

Photonics

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“…When studying object motion, FTP may not meet the requirements for object reconstruction accuracy [ 15 , 16 ]. On the other hand, PSP is the most widely studied method and can obtain high robustness and high-precision pixel-wise phase unwrapping [ 17 , 18 ]. However, PSP may encounter difficulties when dealing with scenes that have dynamic motion, as the movement of objects can cause distortion in the phase, leading to errors.…”

Section: Introductionmentioning

confidence: 99%

Dynamic 3D Measurement without Motion Artifacts Based on Feature Compensation

Wang

Deng

et al. 2023

Sensors

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Phase-shift profilometry (PSP) holds great promise for high-precision 3D shape measurements. However, in the case of measuring moving objects, as PSP requires multiple images to calculate the phase, the movement of the object causes artifacts in the measurement, which in turn has a significant impact on the accuracy of the 3D surface measurement. Therefore, we propose a method to reduce motion artifacts using feature information in the image and simulate it using the six-step term shift method as a case study. The simulation results show that the phase of the object is greatly affected when the object is in motion and that the phase shift due to motion can be effectively reduced using this method. Finally, artifact optimization was carried out by way of specific copper tube vibration experiments at a measurement frequency of 320 Hz. The experimental results prove that the method is well implemented.

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“…In recent years, with the advancement of precision instruments and digital signal processing, the measurement accuracy of moiré fringe methods has been continuously improving. It has become a common technique for surface profiling and displacement measurement at the nanoscale [7,8] .…”

Section: Introductionmentioning

confidence: 99%

Study of window functions for the Moiré fringe phase demodulation

Xie,

Gao,

Yue

et al. 2023

3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023)

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Moiré fringe has become one of the mainstream methods for high-precision distance measurement at present, and the accuracy of moiré fringe-based distance measurement can reach the nanometer level. However, due to the discrete sampling of moiré fringe images by camera and the non-integer sampling, spectral leakage occurs during Fourier transform, thereby affecting the measurement accuracy. By applying a 2D-windowing process to the moiré fringe, the spectral leakage can be effectively reduced and the accuracy of the moiré fringe phase demodulation improved. This paper conducted a simulation analysis on moiré fringes formed by three sets of gratings with different periods and obtained the most suitable window function for each of them. Finally, one set of the gratings was selected for height displacement measurement experiments on a wafer stage. The experimental results achieved a measurement accuracy better than 5nm.

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Application of Moire Profilometry in Three-Dimensional Profile Reconstruction of Key Parts in Railway

Cited by 3 publications

References 24 publications

An Optimized Error Compensation Method for Phase Measurement Profilometry

An Optimized Error Compensation Method for Phase Measurement Profilometry

Dynamic 3D Measurement without Motion Artifacts Based on Feature Compensation

Study of window functions for the Moiré fringe phase demodulation

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