Applied optics最新文献_第7页

6DOF pose measurement with dual-quaternion-introduced absolute orientation using a pseudo-multi-camera system. 伪多相机系统引入双四元数绝对方位的6自由度位姿测量。

Applied optics Pub Date : 2025-09-01 DOI: 10.1364/AO.568849

Zhaojun Deng, Zhenyu Li, Changyu Zhou

{"title":"6DOF pose measurement with dual-quaternion-introduced absolute orientation using a pseudo-multi-camera system.","authors":"Zhaojun Deng, Zhenyu Li, Changyu Zhou","doi":"10.1364/AO.568849","DOIUrl":"https://doi.org/10.1364/AO.568849","url":null,"abstract":"Pose measurement, consisting of position determination and orientation recovery, is applied in many intelligent manufacturing fields. In this paper, six-degree-of-freedom (6DOF) pose measurement with dual-quaternion-introduced absolute orientation using a pseudo-multi-camera system is presented. By planning to straight move and rotate the single camera at a reasonable angle, a pseudo-multi-camera system with the required viewpoints and baseline distances is generated to dynamically build a measurement network. Based on multi-view localization beams from the measurement network, a stereo recovery method is proposed to allow three-dimensional (3D) extraction. Dual-quaternion-introduced absolute orientation for 6DOF estimation is studied to avoid translation extraction dependent on rotation and strict initial value selection. Considering the feature point information from different viewpoints, the 6DOF pose is further refined by multi-view bundle adjustment. The experiment results show that our method outperforms classical methods in accuracy and stability, especially in translation measurement. It also can arrange observation points as needed to adapt to complex measurement scenes. It is expected to be used in scenarios where traditional multi-camera setups are infeasible, such as pipeline inspection, gastrointestinal endoscopy, and shield machine guidance.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 25","pages":"7315-7322"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband antireflection coatings: an exhaustive search and mapping method to find optimal three-layer designs. 宽带增透涂层：一种穷举搜索和映射方法，以找到最佳的三层设计。

Applied optics Pub Date : 2025-09-01 DOI: 10.1364/AO.569016

Huy Van Mai, Alexandre Jaffré, Chi Dung Duong, Emmanuel Blanc, David Alamarguy, Olivier Schneegans

引用次数: 0

CSA-ASPP-Net: end-to-end laser stripe centerline extraction with joint channel-spatial attention and atrous spatial pyramid convolution. csa - asp - net：结合通道空间关注和空间金字塔卷积的端到端激光条纹中心线提取。

Applied optics Pub Date : 2025-09-01 DOI: 10.1364/AO.570244

Bicheng Yuan, Weiquan Mo, Zhenxin He, Wei Tan, Liangchang Zou, Zhigang Yang, Liang Mei, Kun Liu, Hao Sun

{"title":"CSA-ASPP-Net: end-to-end laser stripe centerline extraction with joint channel-spatial attention and atrous spatial pyramid convolution.","authors":"Bicheng Yuan, Weiquan Mo, Zhenxin He, Wei Tan, Liangchang Zou, Zhigang Yang, Liang Mei, Kun Liu, Hao Sun","doi":"10.1364/AO.570244","DOIUrl":"https://doi.org/10.1364/AO.570244","url":null,"abstract":"This study presents an end-to-end laser stripe centerline extraction model, CSA-ASPP-Net, which enables direct mapping from raw laser stripe images to high-precision sub-pixel centerlines through the integrated design of atrous spatial pyramid pooling (ASPP) and channel-spatial attention (CBAM). Our model addresses the limitations of traditional methods, which rely heavily on manually designed features, as well as existing deep learning approaches, which require segmentation-extraction centerlines. By innovatively integrating attention-guided feature enhancement and multi-scale contextual perception modules into an encoder-decoder architecture, the proposed model enables single-stage completion of stripe localization and refinement. The experimental results demonstrate that this end-to-end framework achieves a precision of 94.85% and an average localization error of 0.64 pixels in test images, with a processing speed of 0.15 s per image, highlighting its computational efficiency. The results demonstrate that the CBAM module effectively mitigates background interference by emphasizing salient features, while the ASPP module enhances adaptability to various stripe morphologies through its multi-scale capability. This research provides an innovative and integrated solution tailored for structured light measurement systems, combining efficiency with high precision in laser stripe processing.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 25","pages":"7438-7448"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Open-source compact and adaptable fiber-coupled multi-LED platform for biomedical applications. 用于生物医学应用的开源紧凑且适应性强的光纤耦合多led平台。

Applied optics Pub Date : 2025-09-01 DOI: 10.1364/AO.568586

Hasti Yavari, Lorenzo Niemitz, Yineng Wang, Ray Burke, Stefan Andersson-Engles, Simon T Sørensen

引用次数: 0

Subpixel imaging system with enhanced optical multiplexing. 增强光复用的亚像素成像系统。

Applied optics Pub Date : 2025-09-01 DOI: 10.1364/AO.571020

Shengzhi Qiang, Jiawei Shen, Ran Wang, Zhengguang Duan, Yuanqing Wang

{"title":"Subpixel imaging system with enhanced optical multiplexing.","authors":"Shengzhi Qiang, Jiawei Shen, Ran Wang, Zhengguang Duan, Yuanqing Wang","doi":"10.1364/AO.571020","DOIUrl":"https://doi.org/10.1364/AO.571020","url":null,"abstract":"This paper presents a compact and high-efficiency solid-state three-dimensional (3D) light detection and ranging (LiDAR) system based on subpixel imaging and microlens array-based optical multiplexing. The proposed system integrates a two-dimensional laser diode array transmitter and a receiver composed of a projection lens, a microlens-based multiplexer, and a small-scale avalanche photodiode array. To overcome the limitations of traditional fiber bundle-based multiplexers, a dual-layer microlens array structure is developed, enabling precise subpixel focusing and enhanced spatial multiplexing. The system supports multiple encoding strategies-offering high-resolution imaging (640×480) when using less patterns with CMOS sensors (320×240) and fast 3D imaging when raising encoding counts for downscale detectors (2×2). Experimental results confirm the effectiveness of the design in both 3D point cloud reconstruction and 2D multiplexed imaging scenarios. The proposed architecture is scalable and suitable for integration with time-of-flight modules. This subpixel imaging technique can greatly reduce the number of detectors required in imaging LiDAR systems, making it suitable for low-cost LiDAR applications.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 25","pages":"7540-7547"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Infrared cone-shaped spatial target recognition based on an improved MKELM. 基于改进MKELM的红外锥形空间目标识别。

Applied optics Pub Date : 2025-09-01 DOI: 10.1364/AO.569034

Caiyun Wang, Jiaxuan Han, Yun Chang, Xiaofei Li, Yida Wu

引用次数: 0

Improvement of the strain measurement accuracy via a denoising convolutional neural network in the OFDR system. 利用去噪卷积神经网络提高OFDR系统应变测量精度。

Applied optics Pub Date : 2025-09-01 DOI: 10.1364/AO.569975

Xinlei Qian, Ying Ji, Yong Kong

{"title":"Improvement of the strain measurement accuracy via a denoising convolutional neural network in the OFDR system.","authors":"Xinlei Qian, Ying Ji, Yong Kong","doi":"10.1364/AO.569975","DOIUrl":"https://doi.org/10.1364/AO.569975","url":null,"abstract":"We propose an improved cross-correlation strain demodulation method of the optical frequency domain reflectometry (OFDR) to further enhance the measurement accuracy in dual-requirement scenarios of high spatial resolution and large dynamic strain measurement range. Rather than a conventional signal processing method based on one-dimensional (1D), we transform the distributed global spectrum shifts obtained through cross-correlation calculation along the sensing fiber as a two-dimensional image matrix and employ a denoising convolutional neural network to smoothen the systemic artifacts manifested as cross-correlation fake peaks due to the local similarity degradation between the obtained reference (Ref.) and measured (Mea.) spectra, thereby enabling the reconstruction of accurate strain gradient profiles. Experimental results reveal that this performance enhancement achieves a fivefold and twofold improvement, from 19.63% and 49.53% to 98.27%, respectively, in demodulation accuracy over the 1D moving average smoothing and 1D convolutional neural network methods under an employed strain of 300 µɛ and without hardware modifications. Meanwhile, the strain profiles across both zero-strain and stretched regions at a consistent spatial resolution of 16 mm are measured accurately and clearly. The measured strain linearly changes with the applied strain, with a slope and R2 of 1.03 and 0.99, respectively, when the applied strain is increased from 100 to 900 µɛ, which confirms the efficacy of our proposed scheme in addressing traditional OFDR demodulation challenges.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 25","pages":"7357-7363"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Annual periodicity in ocean color observations across diverse oceanic regions. 不同海洋区域海洋颜色观测的年周期性。

Applied optics Pub Date : 2025-09-01 DOI: 10.1364/AO.566299

E R Blocker, P J Werdell, A Ibrahim, M J Behrenfeld, K M Bisson, E Boss, B A Franz, R Frouin

{"title":"Annual periodicity in ocean color observations across diverse oceanic regions.","authors":"E R Blocker, P J Werdell, A Ibrahim, M J Behrenfeld, K M Bisson, E Boss, B A Franz, R Frouin","doi":"10.1364/AO.566299","DOIUrl":"https://doi.org/10.1364/AO.566299","url":null,"abstract":"The annual periodicity present in spectral remote sensing reflectances (Rrs(λ)) derived from ocean color satellite data processed by NASA's Ocean Biology Processing Group has been shown to diverge from that observed in situ, with the source of the discrepancies remaining unresolved. Here, we investigate such periodicity in reflectances derived from four satellite sensors and seven in situ locations. Periodicity in the time series of Rrs(λ) spectra is examined without prior assumption of the main constituent frequency through application of the floating-mean Lomb-Scargle periodogram. We show that a one-term sinusoidal function specified at the annual frequency with a constant offset reproduces seasonal trends observed at various regional oceanic sites. Although unique regional features in mean, amplitude, and phase are generally well-captured by Rrs(λ) derived from satellite measurements, discrepancies perpetuate the annual frequency into the satellite-to-in situRrs(λ) matchup difference. Specifying the origin of the discrepancy is challenging because the annual frequency is significantly contained in time series of many physical measurements, corrections, and ancillary data required for Rrs(λ) retrievals. Until differences in amplitude and phase between satellite and in situRrs(λ) time series are reduced, improved uncertainty estimates should be incorporated into downstream product analyses.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 25","pages":"7376-7395"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband absorption phenomena in temporal metamaterials with modulation of the refractive index. 具有折射率调制的时间超材料中的宽带吸收现象。

Applied optics Pub Date : 2025-09-01 DOI: 10.1364/AO.569970

Jun-Rui Pan, Hai-Feng Zhang

引用次数: 0

Terahertz imaging of 100 µm scale subsurface defects in both depth and lateral directions in silicone rubber. 硅橡胶中100µm尺度深层和横向缺陷的太赫兹成像。

Applied optics Pub Date : 2025-09-01 DOI: 10.1364/AO.572596

Da-Hye Choi

{"title":"Terahertz imaging of 100 µm scale subsurface defects in both depth and lateral directions in silicone rubber.","authors":"Da-Hye Choi","doi":"10.1364/AO.572596","DOIUrl":"https://doi.org/10.1364/AO.572596","url":null,"abstract":"High-voltage power cables are essential for long-distance energy transmission, where insulation reliability is especially critical at joints and terminations. Polymeric materials, such as silicone rubber (SiR), are widely used, but they remain vulnerable to internal defects, such as air voids and moisture, which can degrade performance and cause failure. Conventional non-destructive evaluation methods, including ultrasonic testing, X-ray imaging, and partial discharge measurements, have limitations in resolution, safety, or field applicability. Terahertz (THz) imaging has emerged as a promising alternative, offering non-contact, high-resolution inspection with sensitivity to moisture. Previous THz studies on polymeric insulators have demonstrated detection of 100 µm scale defects in either the depth or lateral direction, while the defect size along the other dimension typically remained in the millimeter range. To the best of our knowledge, the simultaneous detection of subsurface defects on the order of 100 µm in both directions within polymeric insulators has not yet been achieved. This study demonstrates the feasibility of visualizing internal defects within bulk SiR insulation using a solid immersion lens-based THz time-domain spectroscopy system. Void defects as small as 100 µm in both depth and lateral directions were clearly resolved near the surface. In addition, void defects with a thickness of 100 µm and lateral diameters of several hundred micrometers were detectable at depths up to 1 mm. Furthermore, a layered defect comprising a void and a metallic inclusion was imaged, revealing the inclusion clearly resolved beyond the void, a result unattainable using ultrasonic inspection due to high reflectivity at air interfaces.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 25","pages":"7520-7526"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0