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Photonics
Special Issues
Recent Advances in 3D Optical Measurement
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Recent Advances in 3D Optical Measurement

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optical Interaction Science".

Deadline for manuscript submissions: 15 October 2024 | Viewed by 3126

Special Issue Editors

Dr. Zeren Gao

E-Mail Website
Guest Editor
Shenzhen Key Laboratory of Intelligent Optical Measurement and Detection, College of Physics and Optoelectronic Engineering, Shenzhen University, 3688 Nanhai Avenue, Shenzhen 518060, China
Interests: digital image correlation; experimental mechanics; photomechanics; camera calibration; event camera
Dr. Jinlong Yuan

E-Mail Website
Guest Editor
School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China
Interests: remote sensing; coherent Doppler lidar; wind camera

Special Issue Information

Dear Colleagues,

The field of 3D optical measurement has witnessed significant advancements in recent years. These advancements have been driven by the increasing demand for high-precision, non-contact measurement techniques that can capture complex 3D shapes with accuracy and efficiency. One promising research direction is the development of advanced imaging technologies, such as structured light techniques, multi-camera systems, and laser scanning techniques. These technologies have greatly enhanced the measurement resolution and accuracy, and researchers are now exploring the use of advanced algorithms to further improve the imaging quality and processing speed. Additionally, there is a growing interest in integrating 3D optical measurement with other sensing modalities, such as thermal imaging, ultrasound, laser Doppler, and laser ranging, to obtain a more comprehensive understanding of the objects being measured. This integration opens up new possibilities for applications in medical diagnostics, material characterization, and quality control. Overall, the future of 3D optical measurement holds great promise, with continued research in advanced imaging technologies, integration with other sensing modalities, and the development of portable devices expected to further enhance the capabilities and applications of 3D optical measurement systems.

This Special Issue aims to showcase the latest research and developments in the field of 3D optical measurement and provide a platform for researchers to share their findings and insights. Theoretical, numerical, and experimental papers are welcomed. Topics include, but are not limited to, the following:

  • Advanced imaging technologies for 3D optical measurement;
  • Integration of 3D optical measurement with other sensing modalities;
  • Multi-camera systems and algorithms for improved measurement accuracy;
  • Portable and handheld 3D optical measurement devices;
  • Machine learning and artificial intelligence in 3D optical measurement;
  • Applications of 3D optical measurement in manufacturing and quality control;
  • 3D optical measurement for medical diagnostics and healthcare;
  • Novel calibration methods for 3D optical measurement systems;
  • New theory and technology of optical imaging and measurement;
  • Progress and application of 3D laser imaging.

Dr. Zeren Gao
Dr. Jinlong Yuan
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • 3D optical measurement
  • advanced imaging technologies
  • structured light techniques
  • multi-camera systems
  • advanced algorithms
  • calibration methods
  • extreme measurement
  • holographic measurement
  • 3D imaging laser radar
  • weather laser radar

Published Papers (5 papers)

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Research

18 pages, 7593 KiB  
Article
A Hybrid Improved SAC-IA with a KD-ICP Algorithm for Local Point Cloud Alignment Optimization
by Yinbao Cheng, Haiman Chu, Yaru Li, Yingqi Tang, Zai Luo and Shaohui Li
Photonics 2024, 11(7), 635; https://doi.org/10.3390/photonics11070635 - 2 Jul 2024
Viewed by 359
Abstract
To overcome incomplete point cloud data obtained from laser scanners scanning complex surfaces, multi-viewpoint cloud data needs to be aligned for use. A hybrid improved SAC-IA with a KD-ICP algorithm is proposed for local point cloud alignment optimization. The scanned point cloud data [...] Read more.
To overcome incomplete point cloud data obtained from laser scanners scanning complex surfaces, multi-viewpoint cloud data needs to be aligned for use. A hybrid improved SAC-IA with a KD-ICP algorithm is proposed for local point cloud alignment optimization. The scanned point cloud data is preprocessed with statistical filtering, as well as uniform down-sampling. The sampling consistency initial alignment (SAC-IA) algorithm is improved by introducing a dissimilarity vector for point cloud initial alignment. In addition, the iterative closest point (ICP) algorithm is improved by incorporating bidirectional KD-tree to form the KD-ICP algorithm for fine point cloud alignment. Finally, the algorithms are compared in terms of runtime and alignment accuracy. The implementation of the algorithms is based on the Visual Studio 2013 software configurating point cloud library environment for testing experiments and practical experiments. The overall alignment method can be 40%~50% faster in terms of running speed. The improved SAC-IA algorithm provides better transformed poses, combined with the KD-ICP algorithm to select the corresponding nearest neighbor pairs, which improves the accuracy, as well as the applicability of the alignment. Full article
(This article belongs to the Special Issue Recent Advances in 3D Optical Measurement)
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12 pages, 2808 KiB  
Article
High–Speed Laser Modulation for Low–Noise Micro–Cantilever Array Deflection Measurement
by Weiwei Xue, Yong Su and Qingchuan Zhang
Photonics 2024, 11(7), 619; https://doi.org/10.3390/photonics11070619 - 28 Jun 2024
Viewed by 253
Abstract
In this paper, an innovative approach is introduced to address the noise issues associated with micro–cantilever array deflection measurement systems employing multiple lasers. Conventional systems are affected by laser mode hopping during switching, resulting in wavelength instability and beam spot fluctuations that take [...] Read more.
In this paper, an innovative approach is introduced to address the noise issues associated with micro–cantilever array deflection measurement systems employing multiple lasers. Conventional systems are affected by laser mode hopping during switching, resulting in wavelength instability and beam spot fluctuations that take several hundred milliseconds to stabilize. To mitigate these limitations, a high–speed laser modulation technique is utilized, leveraging the averaging effect over multiple modulation cycles within the sampling window. By driving the lasers with a high–frequency carrier signal, a low–noise and stable output suitable for micro–cantilever beam deflection measurement is achieved. The effectiveness of this approach is demonstrated by simultaneously modulating the lasers and rapidly observing the spectral and centroid variations during high–speed switching using a custom–built high–speed spectrometer. The centroid fluctuations are also analyzed under different modulation frequencies. The experimental results confirm that the high–speed modulation method can reduce the standard deviation of beam spot fluctuations by more than 90%, leading to significant improvements in noise reduction compared to traditional laser switching methods. The proposed high–speed laser modulation approach offers a promising solution for enhancing the precision and stability of multi–laser micro–cantilever array deflection measurement systems. Full article
(This article belongs to the Special Issue Recent Advances in 3D Optical Measurement)
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8 pages, 5773 KiB  
Article
Temporal Analysis of Speckle Images in Full-Field Interferometric and Camera-Based Optical Dynamic Measurement
by Guojun Bai, Yuchen Wei, Bing Chen and Yu Fu
Photonics 2024, 11(6), 548; https://doi.org/10.3390/photonics11060548 - 8 Jun 2024
Viewed by 630
Abstract
Vibration measurement is crucial in fields like aviation, aerospace, and automotive engineering, which are trending towards larger, lighter, and more complex structures with increasingly complicated dynamics. Consequently, measuring a structure’s dynamic characteristics has gained heightened importance. Among non-contact approaches, those based on high-speed [...] Read more.
Vibration measurement is crucial in fields like aviation, aerospace, and automotive engineering, which are trending towards larger, lighter, and more complex structures with increasingly complicated dynamics. Consequently, measuring a structure’s dynamic characteristics has gained heightened importance. Among non-contact approaches, those based on high-speed cameras combined with laser interferometry or computational imaging have gained widespread attention. These techniques yield sequences of images that form a three-dimensional space-time data set. Effectively processing these data is a prerequisite for accurately extracting dynamic deformation information. This paper presents two examples to illustrate the significant advantages of signal processing along the time axis in dynamic interferometric and digital speckle-image-based dynamic measurements. The results show that the temporal process effectively minimizes speckle and electronic noise in the spatial domain and dramatically increases measurement resolutions. Full article
(This article belongs to the Special Issue Recent Advances in 3D Optical Measurement)
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12 pages, 2854 KiB  
Article
Compact Single-Shot Dual-Wavelength Interferometry for Large Object Measurement with Rough Surfaces
by Yizhang Yan, Suhas P. Veetil, Pengfei Zhu, Feng Gao, Yan Kong, Xiaoliang He, Aihui Sun, Zhilong Jiang and Cheng Liu
Photonics 2024, 11(6), 518; https://doi.org/10.3390/photonics11060518 - 28 May 2024
Viewed by 511
Abstract
Single-shot dual-wavelength interferometry offers a promising avenue for surface profile measurement of dynamic objects. However, current techniques employing pixel multiplexing or color cameras encounter challenges such as complex optical alignment, limited measurement range, and difficulty in measuring rough surfaces. To address these issues, [...] Read more.
Single-shot dual-wavelength interferometry offers a promising avenue for surface profile measurement of dynamic objects. However, current techniques employing pixel multiplexing or color cameras encounter challenges such as complex optical alignment, limited measurement range, and difficulty in measuring rough surfaces. To address these issues, this study presents a novel approach to single-shot dual-wavelength interferometry. By utilizing separated polarization illumination and detection, along with a monochromatic polarization camera and two slightly different wavelengths, this method enables the simultaneous recording of two frames of separated interferometric patterns. This approach facilitates straightforward optical alignment, expands measurement ranges, accelerates data acquisition, and simplifies data processing for dual-wavelength interferometry. Consequently, it enables online shape measurement of large dynamic samples with rough surfaces. Full article
(This article belongs to the Special Issue Recent Advances in 3D Optical Measurement)
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13 pages, 3868 KiB  
Article
Research on Monocular Depth Sensing Method Based on Liquid Zoom Imaging
by Zihao Gan, Zhaoyang Liu, Bin Liu, Jianming Lv, Meng Zhang and Huajie Hong
Photonics 2024, 11(4), 353; https://doi.org/10.3390/photonics11040353 - 11 Apr 2024
Viewed by 875
Abstract
Monocular stereo vision has excellent application prospects in the field of microrobots. On the basis of the geometric model of bifocal imaging, this paper proposes a monocular depth perception method by liquid zoom imaging. Firstly, the configuration of a monocular liquid vision system [...] Read more.
Monocular stereo vision has excellent application prospects in the field of microrobots. On the basis of the geometric model of bifocal imaging, this paper proposes a monocular depth perception method by liquid zoom imaging. Firstly, the configuration of a monocular liquid vision system for depth measurement is presented, and the working mechanism of the system is analyzed through theoretical derivation. Then, to eliminate the influence of optical axis drift induced by the liquid gravity factor on the measurement results, the target image area is used as the calculation feature instead of the image vector length. A target area calculation method based on chain code classification and strip segmentation is proposed. Furthermore, in response to the fluctuation problem of liquid lens focal power caused by factors such as temperature and object distance, a dynamic focal length model of the liquid zoom imaging system is constructed after precise calibration of the focal power function. Finally, a testing experiment is designed to validate the proposed method. The experimental results show that the average error of depth perception methods is 4.30%, and its measurement time is only on the millisecond scale. Meanwhile, the proposed method has good generalization performance. Full article
(This article belongs to the Special Issue Recent Advances in 3D Optical Measurement)
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