Article
Automation & Control Systems
Yichen Fu, Junfeng Fan, Fengshui Jing, Min Tan
Summary: This article proposes a set of hardware devices and region adaptive structured light algorithms to overcome the problems caused by high surface reflectivity in fringe projection profilometry. The proposed method is efficient, superior, and accurate in measuring objects with high reflective surface properties.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jinghui Zeng, Wenxin Ma, Wei Jia, Yucheng Li, Haowen Li, Xuewen Liu, Mingkui Tan
Summary: Phase unwrapping is a crucial step in 3-D phase measurement. Existing methods require additional information or assumptions, which affect measurement efficiency. To address this, we propose a self-unwrapping phase-shifting algorithm that retrieves absolute phase without external information, achieving higher efficiency and accuracy.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Engineering, Electrical & Electronic
Pei Zhou, Yue Cheng, Jiangping Zhu, Jialing Hu
Summary: This article proposes a novel HDR 3D surface measurement method based on adaptive speckle projection, which takes into account the reflection distribution. By establishing an efficient segmentation-based mapping strategy and optimizing projection intensity, the method achieves fast generation of adaptive speckle patterns and demonstrates clear advantages in measurement accuracy and coverage compared to traditional methods.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Electrical & Electronic
Haitao Wu, Yiping Cao, Yongbo Dai, Hongmei Li
Summary: This article proposes a novel dynamic 3-D measurement method based on temporal fringe order recognition, which uses binary defocusing technology to achieve high-speed measurement and accurately recognize temporal fringe order at a frame rate of 120 frames/s, enabling dynamic 3-D reconstruction.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Multidisciplinary
Xiangchao Zhang, He Yuan, Rui Xiong, Jian Wang, Xinyang Ma, Zhifei Hu, Min Xu
Summary: A proposed method using interferometric holography and wavefront registration achieves fast and efficient cross-scale measurement of surface defects on large opto-electronics components.
Article
Automation & Control Systems
Wenyuan Chen, Xingjian Liu, Changhai Ru, Yu Sun
Summary: This article presents a new exposure selection approach for high dynamic range measurement. It introduces an image quality metric and pixel filtering to address the challenge of exposure selection in measuring objects with large surface-reflectivity variations. Experimental results showed that compared to traditional HDR methods, the proposed approach achieved similar surface coverage rates and measurement accuracy with only 3-4 exposures on average.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Minghui Duan, Yi Jin, Huaian Chen, Jinjin Zheng, Changan Zhu, Enhong Chen
Summary: This article introduces a motion-estimated phase-shifting profilometry method for automatic 3-D measurements of objects in nonuniform motion. By extracting surface features and accurately detecting subpixel displacements, the method achieves alignment and compensates phase errors of the objects.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Optics
Haihua An, Yiping Cao, Na Yang, Lidan Wang
Summary: This paper proposes an absolute phase retrieval method using one additional coding pattern to measure complex objects. The proposed coding pattern is generated from phase-shifting patterns and phase difference. Experimental results demonstrate that the method achieves the same level of measuring accuracy as traditional methods and has strong robustness for objects with sharp and colorful surfaces.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Zhenmin Zhu, Shuo Qiao, Jing Zhang, Duoduo You
Summary: The fringe projection profilometry (FPP) method is extensively studied and used for its high precision and good noise resistance. However, most metal products in practical 3-D measurement applications do not have ideal Lambertian surfaces, and using too many projected patterns complicates the application while improving robustness. In this paper, we propose a polarization code-multiplexed phase shift (PMPS) method that uses the polarization state of light for encoding and robustly unwraps the phase with complementary gray-code information in the polarization fringe patterns. Compared to traditional methods, the PMPS method can efficiently and robustly reconstruct metallic objects with half the number of projected patterns in the presence of ambient light.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Electrical & Electronic
Ji Li, Jingtian Guan, Xiaobo Chen, Xinyi Le, Juntong Xi
Summary: This article proposes an exposure map fusion method for precise 3-D reconstruction of high dynamic range surfaces, which addresses the issues caused by using image intensity for reconstruction. The method improves reconstruction accuracy by using exposure maps and enhances the signal-to-noise ratio through fusing multiple exposure maps.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Engineering, Multidisciplinary
Yifan Wei, Lei Lu, Jiangtao Xi, Yongkai Yin, Yanguang Yu, Jun Tong, Qinghua Guo
Summary: This paper presents a new method based on projection of multiple fringe patterns to solve the challenging problem of image saturation in three-dimensional shape measurement of objects with shiny surfaces. By projecting a set of phase shifted sinusoidal fringe patterns with different intensity levels, creating masks to pick up unsaturated data, combining unsaturated data based on maximal Signal-to-noise Ratio (SNR), and using the combined images to retrieve phase information, the proposed technique shows improved measurement accuracy due to enhanced SNR. The performance of the method is verified through experiments.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Zonghua Zhang, Yuemin Wang, Feng Gao, Yongjia Xu, Xiangqian Jiang
Summary: This paper proposes a method using stereo vision deflectometer for high-precision measurement of discontinuous specular objects. The method improves measurement accuracy through region segmentation and slope integration, and evaluates the relative positions between different surfaces. Experimental results demonstrate the high accuracy of the proposed method.
Article
Optics
Ruiming Yu, Hongshan Yu, Xianqiang Liang, Wei Sun, Zirong Zeng, Naveed Akhtar
Summary: In this paper, a novel phase-domain modulated hybrid phase-shifting (PDM-HPS) structured light 3D measurement method is proposed, which solves the phase error of existing methods without additional pattern or space constraints. The method integrates phase-shifting speckle and phase-shifting fringe techniques to create a hybrid phase-shifting coding pattern and employs an efficient binary speckle-aided stereo phase matching process for unambiguous phase unwrapping. Experimental results demonstrate that the proposed method achieves comparable measurement accuracy to the multi-frequency (MF) method using only 1/3 projection patterns.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Dong Yang, Yanfeng Zhang, Zhongming Yang
Summary: We proposed a novel optical surface shapes measurement method based on conformal mapping-angular phase -shifting interferometry (APSI). The method involves rotating a Q-plate in the reference light path to introduce a 90-degree phase shift. By utilizing the mathematical tool of conformal mapping, high-precision surface shape demodulation is achieved. The removal of the helical phase in the compound phase resulted in surface shape deviations of 3.33 nm (PV) and 0.26 nm (RMS). This work establishes a foundation for surface shape measurement and compound phase demodulation using vortex beams.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Optics
Peng Xia, Shien Ri, Tomoyoshi Inoue, Yasuhiro Awatsuji, Osamu Matoba
Summary: A parallel phase-shifting digital holography system was developed to measure the surface shape and refractive index of moving transparent objects, utilizing two high-resolution polarization imaging cameras to record and reconstruct phase information. The system was effective in measuring asymmetric objects and accurately capturing the dynamic phase of irregularly shaped transparent objects.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Yin Xiao, Lina Zhou, Wen Chen
Summary: This paper introduces a correspondence imaging approach for reconstructing high-quality objects through complex scattering media. By deriving a rectified theory and introducing temporal correction, the proposed method eliminates the effect of dynamic scaling factors. Experimental results demonstrate the advantages of the proposed method over conventional methods in complex scattering environments, and it can also be combined with other methods to further enhance the quality of reconstructed objects.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zengxuan Jiang, Minghao Chao, Qingsong Liu, Bo Cheng, Guofeng Song, Jietao Liu
Summary: In this paper, a multi-focal metalens with high focusing efficiency controlled by circular polarization multiplexing is demonstrated. The metalens can generate four transversely distributed focal points under normal incidence of linearly polarized light, supporting both left-circularly polarized and right-circularly polarized conversion. Furthermore, an oblique incidence metalens is designed to achieve high total focusing efficiency for terahertz waves and provides potential new applications for polarization imaging and detection.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yiran Wang, Yu Ji, Xuyang Zhou, Xiu Wen, Yutong Li, Zhengjun Liu, Shutian Liu
Summary: This work presents a new reconstruction framework for structured illumination microscopy (SIM), which only requires four raw images and avoids extensive iterative computation. By using checkerboard pattern illumination modulation instead of sinusoidal fringe illumination, the proposed method significantly reduces image acquisition time and achieves higher image reconstruction rate. Additionally, the reconstruction process is non-iterative and not limited by the field of view size.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qian He, Li Pei, Jianshuai Wang, Jingjing Zheng, Tigang Ning, Jing Li
Summary: This paper proposes a 3D refractive index profile visualization method to demonstrate mode activation and evolution in fiber fusion splicing. The method is validated through experimental results and provides support for various fiber splicing operations and mode coupling modulation.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qiwei Li, Qiyu Wang, Fang Lu, Yang Cao, Xu Zhao
Summary: LSHIP is a lenslet-array-based snapshot hyperspectral imaging polarimeter that combines spectral polarization modulation with integral field imaging spectrometry. It can simultaneously acquire three-dimensional spatial and spectral data-cubes for linear Stokes parameters in a single snapshot.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Huicong Li, Bing Lv, Meng Tian, Wenzhu Huang, Wentao Zhang
Summary: This study proposes a temperature compensation scheme for unbalanced interferometers using sensing fibers with different temperature coefficients, aiming to resolve the temperature disturbance and achieve high strain resolution. The experimental results confirm the effectiveness of the proposed scheme in high-resolution, long-term, low-frequency, and static strain sensing.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hongxiang Chang, Rongtao Su, Yuqiu Zhang, Bowang Shu, Jinhu Long, Jinyong Leng, Pu Zhou
Summary: High-speed variable-focus optics provides new opportunities for fiber laser applications in various fields. This paper investigates a non-mechanical axial focus tuning method using coherent beam combining (CBC) technique and proposes a tilt modulation assisted method to extend the tuning range.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yubo Ni, Shuai Fu, Chaoyang Su, Zhaozong Meng, Nan Gao, Zonghua Zhang
Summary: This paper proposes a surface adaptive fringe pattern generation method to accurately measure specular surfaces, eliminating the out-of-focus effect and improving measurement accuracy and reliability.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zifan Wang, Tianfeng Zhou, Qian Yu, Zihao Zeng, Xibin Wang, Junjian Hu, Jiyong Zeng
Summary: Fast-axis collimation (FAC) lens arrays are crucial in laser systems, and their precision can be improved through the development of an optical collimation system and the use of thermal compensation to correct for non-uniform thermal expansion.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Jincheng Chen, Qiuyu Fang, Li Huang, Xin Ye, Luhong Jin, Heng Zhang, Yinqian Luo, Min Zhu, Luhao Zhang, Baohua Ji, Xiang Tian, Yingke Xu
Summary: This study developed a novel deep learning accelerated SRRF method that enables super-resolution reconstruction with only 5 low SNR images, and allows real-time visualization of microtubule dynamics and interactions with CCPs.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Pan Liu, Yongqiang Zhao, Ning Li, Kai Feng, Seong G. Kong, Chaolong Tang
Summary: This article presents a technique for inverse design of multilayer deep-etched gratings (MDEG) using a deep neural network with adaptive solution space. The proposed method trains a deep neural network to predict the probability distribution across the discretized space, enabling evaluation of an optimal solution. The results show improved efficiencies using only a reduced dataset and avoiding one-to-many mapping challenges.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Evelina Bibikova, Nazar Al-wassiti, Nataliya Kundikova
Summary: Light beams possess three types of angular momentum, namely spin angular momentum, extrinsic orbital angular momentum, and intrinsic orbital angular momentum. The interaction between these momenta leads to the spin-orbit interaction of light and topological effects. This study predicts a new topological effect resulting from the influence of extrinsic orbital angular momentum on spin angular momentum in converging asymmetrical light beams. It manifests as the transformation of linear polarized light into elliptically polarized light when an asymmetrical beam passes through the left or right half of the focal plane. The measured value of the topological circular amplitude anisotropy R was found to be R = +/- (0.60 +/- 0.08) x 10(-3). This new effect contributes to our understanding of light and has potential applications in developing sensors in optics.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hamdy H. Wahba
Summary: This study combines multiple-beam Fizeau interference and single-shot digital holographic interferometry to study thick phase objects. By collecting optical phase at different focal planes, the angular spectrum method is used for the first time to retrieve optical phase maps through the focal depth. The proposed method proves to be effective in providing accurate numerical focusing and phase maps reconstruction.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Mohammed A. Isa, Richard Leach, David Branson, Samanta Piano
Summary: Due to the complexity of resolving object form and pose in images, new vision algorithms prioritize identification and perception over accurate coordinate measurement. However, the use of planar targets for coordinate measurement in vision systems has several drawbacks, including calibration difficulties and limited viewing angles. On the other hand, the use of sphere targets is infrequent in vision-based coordinate metrology due to the lack of efficient multi-view vision algorithms for accurate sphere measurements.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Ildar Rakhmatulin, Donald Risbridger, Richard M. Carter, M. J. Daniel Esser, Mustafa Suphi Erden
Summary: This paper reviews the application of machine learning in laser systems. While machine learning has been widely used in general control automation and adjustment tasks, its application in specific tasks requiring skilled workforces for high-precision equipment assembly and adjustment is still limited. The paper presents promising research directions for using machine learning in mirror positional adjustment, triangulation, and optimal laser parameter selection, based on the recommendations of PRISMA.
OPTICS AND LASERS IN ENGINEERING
(2024)