Article
Optics
Chuanguo Xiong, Yuhan Gao, Yuhua Huang, Fulong Zhu
Summary: In this study, a projected-speckle deflectometry based on the digital image correlation technique is proposed to solve the issues of out-of-focus image acquisition and ambient light interference in traditional deflectometry techniques. The measurement accuracy of the system is validated through quantitative deformation experiments and comparison with other measurement methods. The effects of projector vibration, electronic noise, and out-of-plane movements on measurement results are also analyzed.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Engineering, Aerospace
Zhe Dong, Yongzeng Li, Lingrui Jiao, Weiguo Zhang, Yingzheng Liu, Di Peng
Summary: A novel speckle pattern pressure-sensitive paint (PSP) system integrating the single-shot lifetime method and stereo digital image correlation (DIC) technique was proposed in this work. This system was successfully applied to measure the instantaneous pressure and deformation field of a high-speed rotating blade, showing highly consistent results with the regular PSP.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Optics
Xiaosen Ye, Jiaqing Zhao
Summary: This paper proposes a novel rotated sigmoid weight (RSW) function for digital image correlation (DIC), and the experiment results show that DIC combined with RSW function (RSW-DIC) achieves the best spatial resolution without sacrificing much measurement resolution.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Computer Science, Information Systems
Sezin Barin, Guer Emre Gueraksin
Summary: Dermoscopy is a common method for early diagnosis of skin cancer, but hair structures in dermoscopy images can hinder accurate diagnosis. This study proposes an algorithm based on conventional image processing methods to remove hair structures from these images. The algorithm shows good performance in removing hair and improves classification accuracy.
MULTIMEDIA TOOLS AND APPLICATIONS
(2023)
Article
Medicine, General & Internal
Xiong Ye, Zhi Liu, Ying Ma, Ye Song, Lihua Hu, Jianwen Luo, Hui Xiao
Summary: A novel diaphragm deformation ultrasound imaging method was developed in this study using a NCC algorithm for real-time tracking of right diaphragm movements. Horizontal displacements were greater than vertical displacements, and global strain was found to be insensitive to the imaging plane.
FRONTIERS IN MEDICINE
(2021)
Article
Optics
Shuyue Zhu, Wenjun Yi, Meicheng Fu, Junli Qi, Mengjun Zhu, Xin Chen, Hongyu Zhang, Junyi Du, Ping Wang, Ju Liu, Xiujian Li
Summary: For speckle-correlation-based scattering imaging, the use of an iris next to the diffuser is common to enhance speckle contrast, but it limits light flux and cooperation. This study demonstrates a non-iris speckle-correlation imaging method combined with image resizing, achieving high-fidelity noncooperative speckle-correlation imaging without iris by resizing the raw captions or on-chip pixel binning. This method opens up possibilities for high-frame-rate speckle-correlation imaging and benefits scattering imaging for dynamic objects hidden behind opaque barriers.
CHINESE OPTICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Y. Wang, Y. Gao, Y. Liu, Z. Gao, Y. Su, Q. Zhang
Summary: The study captured speckle images with different apertures and speckle generation parameters, and evaluated the corresponding measurement errors. The optimal speckle generation parameters were experimentally determined to be consistent with existing theoretical models. The optimal aperture was found to be 5.6, as excessively large or small F-numbers would reduce measurement accuracy.
EXPERIMENTAL MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Ruiyang Wang, Xinwei Zhang, Dahai Li
Summary: Traditional phase measuring deflectometry and digital image correlation based deflectometry have limitations in dynamic measurement, while our proposed single-shot dynamic speckle deflectometry offers a solution with validated accuracy and robustness through numerical simulations and practical measurements.
Article
Optics
E. Baradit, M. Avendano, G. Canas, M. Yanez, M. Trivi, J. Carine
Summary: This paper investigates the application of qualitative algorithms in processing images with dynamic speckle to generate a three-dimensional intensity map for characterizing the topography of a sample. Various algorithms are reviewed and evaluated for their robustness to the number of frames and dependence on the illumination profile. The results show that the normalized DJC method achieves stable characterization of hidden topography under a layer of paint.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Chemistry, Analytical
Alvaro Souto Janeiro, Antonio Fernandez Lopez, Marcos Chimeno Manguan, Pablo Perez-Merino
Summary: This paper presents a novel methodology for high-frequency full-field vibrational analysis using the combination of three-dimensional digital image correlation and the projection of a speckle pattern. The method allows for accurate extraction of vibration parameters and demonstrates its potential in composite material structures.
Article
Engineering, Multidisciplinary
Zhenning Liang, Jinxiu Zhang, Longhui Qiu, Guangyi Lin, Fengfu Yin
Summary: The digital image correlation technique with non-fixed camera is developed for deformation measurement in the field, providing a more flexible and convenient method to measure deformation of high altitude facilities. Multiple images and feature templates are used for correction to ensure accuracy.
Article
Chemistry, Analytical
Ning Lu, Liping Yu, Qianqian Wang, Bing Pan
Summary: In this study, a reliable and reproducible method for high-temperature speckle fabrication is proposed, based on air plasma spraying and flexible speckle templates. The method involves covering the sample surface with pre-designed speckle templates and then spraying the melted speckle powders onto the specimen surface using an air plasma spray technique to obtain customized speckle patterns. Experimental results demonstrate that the speckle patterns made by the proposed method adhere well to the sample surface, remain stable during the heating process, and exhibit excellent agreement with the reference values.
Article
Engineering, Electrical & Electronic
Haoran Li, Xiaoyan Wu, Guodong Liu, Xiaoyan Wang, Songjie Luo, Ziyang Chen, Jixiong Pu
Summary: A new modulation scheme, Hadamard-Genetic algorithm (HGA), is proposed in this study, combining the advantages of Hadamard encoding algorithm (HEA) and genetic algorithm (GA) to generate specific focal patterns with uniform intensity distribution. It outperforms traditional optimization schemes in suppressing intensity fluctuations of the focal pattern and is expected to be applied in laser processing and particle manipulation.
IEEE PHOTONICS JOURNAL
(2021)
Article
Optics
Jinming Luo, Laize Li, Guosheng Yang, Miaohong Chen, Lingna Weng, Jiayao Yang, Yuancong Zhong, Dingnan Deng
Summary: Based on the refraction characteristic of liquid, the internal standard method for measuring liquid refractive index is analyzed, and an improved laser speckle method is proposed. This method uses a double-cell structure composed of two identical glass cells, with one containing the liquid to be measured and the other being empty. The improved method significantly reduces the measurement error and improves the measurement accuracy compared to the Abbe refractometer and internal standard method.
OPTICAL ENGINEERING
(2023)
Article
Optics
Alejandro Velez-Zea, John Fredy Barrera-Ramirez, Roberto Torroba
Summary: This study demonstrates the generation of phase holograms of multiple 3D objects at different axial positions without cross talk, with significant improvements in performance over conventional methods. They propose a new iterative hologram generation algorithm that takes advantage of a propagation approach based on singular value decomposition and fast computation. The proposed method achieves 4 times faster computation and improved reconstruction quality.
Article
Optics
Zhijing Yu, Kai Ma, Zhijun Wang, Jun Wu, Tao Wang, Jingchang Zhuge
OPTICS COMMUNICATIONS
(2018)
Article
Optics
Jun Wu, Xin Li, Haitao Xu, Jun Xu, Zhijing Yu
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2019)
Article
Engineering, Multidisciplinary
Yue Ji, Jun Wu
Article
Engineering, Multidisciplinary
Jun Wu, Yanling Li, Fengcheng Song, Yuheng Zhu, Zhijing Yu
Summary: This paper proposes a non-contact three-dimensional temperature field measurement method based on the rotating tomography schlieren method, which obtains projections from different directions of the temperature field using a transmission schlieren system and calculates the 3D temperature field using calibration schlieren method and projection reconstruction algorithm. Validation experiments show a relative error of approximately 3.7% in reconstructed temperature compared with a precision thermocouple for single flame and double flame cases.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Jun Wu, Fengcheng Song, Chengbin Feng, Zhijing Yu
Summary: This paper proposes a full space coordinate measurement method with a portable light pen using hybrid light field imaging, which simplifies the structure and improves depth estimation for high-precision measurement.
Article
Computer Science, Information Systems
Jun Wu, Zhan Li, Jin Zhang, Ning Wang, Tao Wang, Hao Wang, Jie Tang
Article
Engineering, Multidisciplinary
Sicheng Jiao, Shixiang Wang, Minge Gao, Min Xu
Summary: This paper presents a non-contact method of thickness measurement for thin-walled rotary shell parts based on a chromatic confocal sensor. The method involves using a flip method to obtain surface profiles from both sides of the workpiece, measuring the decentration and tilt errors of the workpiece using a centering system, establishing a unified reference coordinate system, reconstructing the external and internal surface profiles, and calculating the thickness. Experimental results show that the method can accurately measure the thickness of a sapphire spherical shell workpiece and is consistent with measurements of other materials.
Article
Engineering, Multidisciplinary
Rajeev Kumar, Sajal Agarwal, Sarika Pal, Alka Verma, Yogendra Kumar Prajapati
Summary: This study evaluated the performance of a CaF2-Ag-MXene-based surface plasmon resonance (SPR) sensor at different wavelengths. The results showed that the sensor achieved the maximum sensitivity at a wavelength of 532 nm, and higher sensitivities were obtained at shorter wavelengths at the expense of detection accuracy.
Article
Engineering, Multidisciplinary
Attilio Di Nisio, Gregorio Andria, Francesco Adamo, Daniel Lotano, Filippo Attivissimo
Summary: Capacitive sensing is a widely used technique for a variety of applications, including avionics. However, current industry standard Capacitive Level Sensors (CLSs) used in helicopters perform poorly in terms of sensitivity and dynamic characteristics. In this study, novel geometries were explored and three prototypes were built and tested. Experimental validation showed that the new design featuring a helicoidal slit along the external electrode of the cylindrical probe improved sensitivity, response time, and linearity.
Article
Engineering, Multidisciplinary
Kai Yang, Huiqin Wang, Ke Wang, Fengchen Chen
Summary: This paper proposes an effective measurement method for dynamic compaction construction based on time series model, which enables real-time monitoring and measurement of anomalies and important construction parameters through simulating motion state transformation and running time estimation.
Article
Engineering, Multidisciplinary
Hui Fu, Qinghua Song, Jixiang Gong, Liping Jiang, Zhanqiang Liu, Qiang Luan, Hongsheng Wang
Summary: An automatic detection and pixel-level quantification model based on joint Mask R-CNN and TransUNet is developed to accurately evaluate microcrack damage on the grinding surfaces of engineering ceramics. The model is effectively trained on actual micrograph image dataset using a joint training strategy. The proposed model achieves reliable automatic detection and fine segmentation of microcracks, and a skeleton-based quantification model is also proposed to provide comprehensive and precise measurements of microcrack size.
Review
Engineering, Multidisciplinary
Sang Yeob Kim, Da Yun Kwon, Arum Jang, Young K. Ju, Jong-Sub Lee, Seungkwan Hong
Summary: This paper reviews the categorization and applications of UAV sensors in forensic engineering, with a focus on geotechnical, structural, and water infrastructure fields. It discusses the advantages and disadvantages of sensors with different wavelengths and addresses the challenges of current UAV technology and recommendations for further research in forensic engineering.
Article
Engineering, Multidisciplinary
Anton Nunez-Seoane, Joaquin Martinez-Sanchez, Erik Rua, Pedro Arias
Summary: This article compares the use of Mobile Laser Scanners (MLS) and Aerial Laser Scanners (ALS) for digitizing the road environment and detecting road slopes. The study found that ALS data and its corresponding algorithm achieved better detection and delimitation results compared to MLS. Measuring the road from a terrestrial perspective negatively impacted the detection process, while an aerial perspective allowed for scanning of the entire slope structure.
Article
Engineering, Multidisciplinary
Nur Luqman Saleh, Aduwati Sali, Raja Syamsul Azmir Raja Abdullah, Sharifah M. Syed Ahmad, Jiun Terng Liew, Fazirulhisyam Hashim, Fairuz Abdullah, Nur Emileen Abdul Rashid
Summary: This study introduces an enhanced signal processing scheme for detecting mouth-click signals used by blind individuals. By utilizing additional band-pass filtering and other steps, the detection accuracy is improved. Experimental results using artificial signal data showed a 100% success rate in detecting obstacles. The emerging concepts in this research are expected to benefit radar and sonar system applications.
Article
Engineering, Multidisciplinary
Jiqiang Tang, Shengjie Qiu, Lu Zhang, Jinji Sun, Xinxiu Zhou
Summary: This paper studies the magnetic noise level of a compact high-performance magnetically shielded room (MSR) under different operational conditions and establishes a quantitative model for magnetic noise calculation. Verification experiments show the effectiveness of the proposed method.
Review
Engineering, Multidisciplinary
Krzysztof Bartnik, Marcin Koba, Mateusz Smietana
Summary: The demand for miniaturized sensors in the biomedical industry is increasing, and optical fiber sensors (OFSs) are gaining popularity due to their small size, flexibility, and biocompatibility. This study reviews various OFS designs tested in vivo and identifies future perspectives and challenges for OFS technology development from a user perspective.
Article
Engineering, Multidisciplinary
Yue Wang, Lei Zhou, Zihao Li, Jun Wang, Xuangou Wu, Xiangjun Wang, Lei Hu
Summary: This paper presents a 3-D reconstruction method for dynamic stereo vision of metal surface based on line structured light, overcoming the limitation of the measurement range of static stereo vision. The proposed method uses joint calibration and global optimization to accurately reconstruct the 3-D coordinates of the line structured light fringe, improving the reconstruction accuracy.
Article
Engineering, Multidisciplinary
Jaafar Alsalaet
Summary: Order tracking analysis is an effective tool for machinery fault diagnosis and operational modal analysis. This study presents a new formulation for the data equation of the second-generation Vold-Kalman filter, using separated cosine and sine kernels to minimize error and provide smoother envelopes. The proposed method achieves high accuracy even with small weighting factors.
Article
Engineering, Multidisciplinary
Tonglei Cao, Kechen Song, Likun Xu, Hu Feng, Yunhui Yan, Jingbo Guo
Summary: This study constructs a high-resolution dataset for surface defects in ceramic tiles and addresses the scale and quantity differences in defect distribution. An improved approach is proposed by introducing a content-aware feature recombination method and a dynamic attention mechanism. Experimental results demonstrate the superior accuracy and efficiency of the proposed method.
Article
Engineering, Multidisciplinary
Qinghong Fu, Yunxi Lou, Jianghui Deng, Xin Qiu, Xianhua Chen
Summary: Measurement and quantitative characterization of aging-induced gradient properties is crucial for accurate analysis and design of asphalt pavement. This research proposes the composite specimen method to obtain asphalt binders at different depths within the mixture and uses dynamic shear rheometer tests to measure aging-induced gradient properties and reveal internal mechanisms. G* master curves are constructed to investigate gradient aging effects in a wide range. The study finds that the composite specimen method can effectively restore the boundary conditions and that it is feasible to study gradient aging characteristics within the asphalt mixture. The study also observes variations in G* and delta values and the depth range of gradient aging effects for different aging levels.
Article
Engineering, Multidisciplinary
Min Li, Kai Wei, Tianhe Xu, Yali Shi, Dixing Wang
Summary: Due to the limitations of ground monitoring stations in China for the BDS, the accuracy of BDS Medium Earth Orbit (MEO) satellite orbits can be influenced. To overcome this, low Earth orbit (LEO) satellites can be used as additional monitoring stations. In this study, data from two LEO satellites were collected to improve the precise orbit determination of the BDS. By comparing the results with GPS and BDS-2/3 solutions, it was found that including the LEO satellites significantly improved the accuracy of GPS and BDS-2/3 orbits.
