Article
Optics
Renjun Peng, Mingrui Tian, Li Xu, Lifeng Yang, Huimin Yue
Summary: This paper presents a new generating technique of sinusoidal fringes for 3D shape measurement, which has the potential for high frame rates and is easy to implement.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Chemistry, Analytical
Junhui Mei, Xiao Yang, Zhenxin Wang, Xiaobo Chen, Juntong Xi
Summary: This paper proposes a topology-based stereo matching method for 3D measurement using a single pattern of coded spot-array structured light. Experimental results demonstrate that the proposed technique can successfully decode each spot and establish stereo matching relation, achieving the goal of 3D reconstruction.
Article
Optics
An Jin, Jie Lin, Bin Liu, Lei Wang, Peng Jin
Summary: The study proposed using moire fringes technology (MFT) to detect the dynamic radial error motion of high-speed spindles (HSS), successfully improving measurement accuracy and meeting the requirements for high speeds.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Seok Kim, Jordan J. Handler, Young Tae Cho, George Barbastathis, Nicholas X. Fang
Summary: A new integral lithography method is proposed, utilizing a planar lens array to create digital light patterns to expand the printable area and achieve scalable 3D microstructure fabrication, surpassing the resolution-to-area scaling limit.
Article
Engineering, Electrical & Electronic
Daniele Pinchera, Marco Donald Migliore, Gaetano Panariello
Summary: This research proposes a method for synthesizing equal-amplitude aperiodic array radiating patterns, capable of scanning in a wide angular range while maintaining the sidelobe level constraint. By iteratively adjusting the sources, the excitation dynamic of the starting layout can be reduced. The method is flexible and exhibits excellent performance in numerical simulations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Optics
Jianhua Wang, Yanxi Yang, Peng Xu, Jintao Liu
Summary: This paper proposes a new high dynamic range 3-D measurement method based on inverted fringes to solve the phase error caused by saturation in fringe projection profilometry. By projecting a set of inverted fringes, the efficient phase extraction method using the 3 f(H) C 2 f(M) C 2 f(L) algorithm replaces saturated pixels in the original fringes with unsaturated pixels. Analysis of 72 fringe replacement cases provides corresponding wrapped phase calculation, and experiments verify the validity of the proposed method. The simplicity and convenience of implementation make extensive exposure adjustments and complex projection intensity adjustment unnecessary.
Article
Computer Science, Artificial Intelligence
Lei Hou, Dejun Xi, Jun Luo, Yi Qin
Summary: This paper presents a multi-stage generative adversarial network with a self-attention mechanism to correct defocus fringe patterns and transform them into more ideal sinusoidal fringe patterns, thereby improving the accuracy of high-speed 3D measurements.
ADVANCED ENGINEERING INFORMATICS
(2023)
Article
Engineering, Electrical & Electronic
Zhihu Li, Changping Hu, Jiwen Zhang, Guolei Wang, Dan Wu, Shuntao Liu, Jing Xu
Summary: This article introduces a smoothed-truncated-sine (STS) pattern design method that achieves higher accuracy than sinusoidal patterns under the same noise. The STS pattern achieves a higher signal-to-noise ratio (SNR) to reduce random error and maintains the amplitude of sensitive harmonics low to restrain systematic error. Simulations and experiments demonstrate that the proposed method achieves higher accuracy than sinusoidal patterns.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Chemistry, Analytical
Yanjun Zhang, Junhua Sun
Summary: This paper proposes a phase retrieval method for 3D shape measurement of high-reflectivity surfaces. The method effectively suppresses phase retrieval errors caused by overexposure by replacing saturated pixels in fringe patterns. Experimental results demonstrate the performance of the proposed method on highly reflective surfaces.
Article
Optics
Wen Guo, J. M. Huntley, C. R. Coggrave, P. D. Ruiz
Summary: This paper describes the design of a binary fringe projector using a binary phase mask to enhance performance. The anisotropic point spread function of the phase mask produces a well-defined blur of fringes parallel to the fringe direction, minimizing degradation of fringe contrast. Two new binary fringe design methods are proposed, and expressions for phase noise are derived.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Eugene Wong, Stefan Heist, Christian Braeuer-Burchardt, Andreas Stark, Holger Babovsky, Richard Kowarschik
Summary: This study introduces a solution for synthesizing MAAP calibration images from any camera view, allowing for 3D measurements from alternate camera placements without re-calibrating the entire MAAP process.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Chemistry, Analytical
Anna Lena Lorenz, Song Zhang
Summary: This paper presents a non-contact continuous respiration monitoring method based on Fringe Projection Profilometry (FPP), which overcomes the limitations of traditional intrusive techniques by providing continuous monitoring without interfering with normal breathing. The FPP sensor captures three-dimensional respiratory motion from the chest wall and abdomen, and the analysis algorithms extract respiratory parameters. The experimental results demonstrate high signal-to-noise ratio and good correlation with a reference signal obtained from a spirometer.
Article
Automation & Control Systems
Yunkyung Hwang, Jaehong Kim
Summary: The gearwheel encoder with a magnetoresistive sensor is commonly used in industrial motor drives for its robustness and simplicity. However, the manually mounted MR sensor causes imperfections in the output signals, leading to speed ripples in the speed measurement. This study analyzes the ripples and proposes an effective ripple-elimination method, which involves calculating ripple components and designing a frequency adaptive series notch filter algorithm. The simulation and experimental results validate the analysis and proposed approach, demonstrating almost complete elimination of speed measurement ripple.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Optics
Wen Guo, C. R. Coggrave, J. M. Huntley, P. D. Ruiz
Summary: This paper introduces a method for dynamically measuring the shape of objects using a digital micromirror device (DMD). By designing a binary phase mask, high-quality greyscale fringes can be produced. Compared to traditional methods, this approach has reduced phase noise and improves the quality of the projected fringes. Experimental results show that increasing the number of projector frames can reduce phase noise and the acquisition rate is faster than traditional 8-bit greyscale sequences.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Pratik Mevada, Sanjeev Gupta, Soumyabrata Chakrabarty, Milind Mahajan
Summary: This article discusses the design of beam-steerable aperiodic linear array antenna with improved sidelobe level using the strip-projection method. Various evolutionary optimization algorithms are employed to generate the aperiodic arrays and compared with the conventional periodic array. The experimental results show a significant improvement in peak sidelobe level at +/- 30 degrees beam scan angle.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)