Optics and Lasers in Engineering最新文献_第9页

Corrigendum to “Seeing through fire with one pixel” [Optics and Lasers in Engineering 183 (2024) 108540] 用一个像素看穿火焰 "的更正 [光学与激光工程 183 (2024) 108540]

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-15 DOI: 10.1016/j.optlaseng.2024.108632

Zilin Deng , Zibang Zhang , Siming Xiong , Qianlong Wang , Huibin Chang , Jingang Zhong

引用次数: 0

Novel rotational speed measuring method based on micro-indentation-shaft detected by optical coherent system 基于光学相干系统检测微压痕轴的新型转速测量方法

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-14 DOI: 10.1016/j.optlaseng.2024.108634

Wei Liang , Xiaodong Hong , Dichang Huang , Linnan Chen , Jianfeng Zhong , Qiukun Zhang , Jiewen Lin , shuncong Zhong , Tao Li

{"title":"Novel rotational speed measuring method based on micro-indentation-shaft detected by optical coherent system","authors":"Wei Liang , Xiaodong Hong , Dichang Huang , Linnan Chen , Jianfeng Zhong , Qiukun Zhang , Jiewen Lin , shuncong Zhong , Tao Li","doi":"10.1016/j.optlaseng.2024.108634","DOIUrl":"10.1016/j.optlaseng.2024.108634","url":null,"abstract":"<div><div>Accurate rotational speed measurement is a prerequisite for realizing the condition monitoring and fault diagnosis of rotating equipment. This study proposes a novel rotational speed measurement method based on optical coherent displacement measurement. An optical coherence system is used to measure the relative depth of the shaft surface with uniformly etched micro-indentations on the circumferential surface. Fast Fourier transform (FFT) and the Hanning window energy centrobaric method (HnWECM) are used to process the collected photoelectric signals to obtain depth information and thereby realize the measurement of surface micro-indentations. During the operation, the rotational speed of the shaft is obtained by calculating the ratio of the angular difference between the relative depth of the rectangular pulses of the surface and the time interval. The experimental validation of the response is performed. The experimental results show that in the range of 0 rpm to 60 rpm, the indication error is <1 %, the nonlinearity error is <0.3584 %, and the repeatability error is <0.28 %. In the range of 0 rpm to 600 rpm, the rotational speed measurement method performed well with an indication error of <0.5 %, a maximum nonlinear error of 0.22 %, and a repeatability error of no >0.28 %. Compared with the results reported in existing literature, the proposed method offers advantages in terms of accuracy, linearity, and repeatability.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108634"},"PeriodicalIF":3.5,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Scanning technique for direct optical transmission imaging of highly-scattering objects 对高散射物体进行直接光学透射成像的扫描技术

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-14 DOI: 10.1016/j.optlaseng.2024.108633

Svetlana Shmavonyan, Aleksandr Khanbekyan, Marina Movsisyan, Aram Papoyan

引用次数: 0

Laser ultrasonic system for metal pipe wall thickness measurement: Differential signal processing and geometric compensation calculation model 用于金属管道壁厚测量的激光超声波系统：差分信号处理和几何补偿计算模型

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-12 DOI: 10.1016/j.optlaseng.2024.108625

Jiashu Wang, Quan Yang, Xiaochen Wang, Xing Mao

{"title":"Laser ultrasonic system for metal pipe wall thickness measurement: Differential signal processing and geometric compensation calculation model","authors":"Jiashu Wang, Quan Yang, Xiaochen Wang, Xing Mao","doi":"10.1016/j.optlaseng.2024.108625","DOIUrl":"10.1016/j.optlaseng.2024.108625","url":null,"abstract":"<div><div>Metal pipes are extensively utilized in various industries. However, uneven wall thickness resulting from aging, corrosion, and other factors can pose safety hazards. While traditional inspection methods have limitations, laser ultrasonic technology provides non-contact, long-distance detection, making it suitable for online inspection in challenging environments. In this study, laser ultrasonic technology is employed to detect the wall thickness of metal pipes, overcoming challenges such as same-side detection and signal processing. A signal processing method based on the differential algorithm successfully extracted a clear and stable longitudinal wave signal while effectively suppressing noise interference. Additionally, a new wall thickness calculation model considering the pipe's geometry is developed. Experimental validation demonstrated that the calculation results of the model are in good agreement with the actual measured values, with a relative error of 2.19%. These results confirm the high accuracy and reliability of the laser ultrasonic method in the wall thickness inspection of metal pipes and demonstrate its potential in this field.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108625"},"PeriodicalIF":3.5,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A lightweight object detection algorithm for coal and gangue with laser speckle imaging 利用激光斑点成像技术检测煤炭和矸石的轻量级物体检测算法

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-12 DOI: 10.1016/j.optlaseng.2024.108630

Hequn Li, Ling Ling, Yufei Zheng, Hanxi Yang, Yun Liu, Mingxing Jiao

{"title":"A lightweight object detection algorithm for coal and gangue with laser speckle imaging","authors":"Hequn Li, Ling Ling, Yufei Zheng, Hanxi Yang, Yun Liu, Mingxing Jiao","doi":"10.1016/j.optlaseng.2024.108630","DOIUrl":"10.1016/j.optlaseng.2024.108630","url":null,"abstract":"<div><div>Laser speckle imaging, known for its ability to capture object surface features with simple setup and reduced sensitivity to ambient light, is of significant research interest for coal and gangue recognition. However, the complex surface structures of minerals in practical settings pose challenges in improving recognition accuracy over large sample sizes and extended periods using manual feature design. To address this issue, we propose a coal and gangue recognition method that integrates laser speckle imaging with deep learning. Based on objective speckle imaging theory, we designed a coal and gangue laser speckle image acquisition system and curated a dataset encompassing diverse lighting conditions for speckle imaging. We developed a lightweight YOLOv5s model to extract rich surface information from mineral laser speckle images, achieving high-precision coal and gangue detection while reducing computational demands. Experimental results demonstrate significant improvements in model size, training effectiveness, feature extraction, and recognition accuracy by lightening the YOLOv5s model. Furthermore, our method exhibits improved accuracy and stability in coal and gangue recognition under varying lighting conditions compared to manual feature design approach. Additionally, our model strikes a balance between complexity and accuracy, offering practical advantages over existing models for industrial applications. These findings provide valuable technical support for the future realization of intelligent coal and gangue recognition.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108630"},"PeriodicalIF":3.5,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Programmable linear retarder using liquid crystal variable retarders with calibration for non-ideal beam splitter properties 使用液晶可变缓速器的可编程线性缓速器，可针对非理想分光器特性进行校准

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-09 DOI: 10.1016/j.optlaseng.2024.108623

Chien-Yuan Han , Zhen-Xiang Chao , Yi-Hsin Chan , Chih-Jen Yu

引用次数: 0

High-speed low-cost line-field spectral-domain optical coherence tomography for industrial applications 用于工业应用的高速、低成本线场光谱域光学相干断层成像技术

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-09 DOI: 10.1016/j.optlaseng.2024.108631

Xingyu Yang , Zijian Zhang , Xinhua Li , Hungyen Lin , Samuel Lawman , Stoyan Stoyanov , Timothy Tilford , Yihua Hu , Yaochun Shen , Yalin Zheng

引用次数: 0

Efficient multi-objective design method for optical coatings 光学镀膜的高效多目标设计方法

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-08 DOI: 10.1016/j.optlaseng.2024.108626

Jianglin Dai , Xiaochuan Ji , Xinshang Niu , Hongfei Jiao , Xinbin Cheng , Zhanshan Wang , Jinlong Zhang

引用次数: 0

Analysis of diffraction gratings displayed in spatial light modulators at the Nyquist limit: Application to the triplicator grating 奈奎斯特极限空间光调制器中显示的衍射光栅分析：三重光栅的应用

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-07 DOI: 10.1016/j.optlaseng.2024.108628

Shang Gao (高尚) , María del Mar Sánchez-López , Ignacio Moreno

{"title":"Analysis of diffraction gratings displayed in spatial light modulators at the Nyquist limit: Application to the triplicator grating","authors":"Shang Gao (高尚) , María del Mar Sánchez-López , Ignacio Moreno","doi":"10.1016/j.optlaseng.2024.108628","DOIUrl":"10.1016/j.optlaseng.2024.108628","url":null,"abstract":"<div><div>In this work we analyze diffraction gratings displayed on a pixelated spatial light modulator (SLM) at its spatial resolution limit (Nyquist limit) i.e., with largest diffraction angle, where the binary phase profile is the only alternative. Their implementation is influenced by the effect of a <span><math><mtext>sinc</mtext></math></span> envelope and the multiple replicas of the diffraction pattern that arise from the SLM pixelation, where the fill factor plays an essential role. We use the Fourier transform theory to analyze the binary phase grating in a pixelated device in terms of the pixel size, fill factor and phase difference between the two levels in the grating. This convolutional approach probes very useful to gain physical insight of the different contributions to the diffraction orders, and analytical expressions for the complex amplitude coefficients and intensities are obtained. Experimental verification is provided by encoding binary phase triplicator gratings with different periods on a high-resolution liquid-crystal on silicon SLM. The effect of the device pixelation and pixel crosstalk on the diffraction efficiency and on the conditions to obtain a Nyquist triplicator phase grating are studied. These results can be interesting for applications requiring programmable and large beam steering angles.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108628"},"PeriodicalIF":3.5,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Significance of defocussing distance in laser based directed energy deposition of steel powders: Effect on clad geometrical characteristics and process parameter maps. 基于激光的钢粉定向能沉积中散焦距离的意义：对熔覆几何特征和工艺参数图的影响。

IF 3.5 2区工程技术

Optics and Lasers in Engineering Pub Date : 2024-10-07 DOI: 10.1016/j.optlaseng.2024.108618

Monideepa Mukherjee

{"title":"Significance of defocussing distance in laser based directed energy deposition of steel powders: Effect on clad geometrical characteristics and process parameter maps.","authors":"Monideepa Mukherjee","doi":"10.1016/j.optlaseng.2024.108618","DOIUrl":"10.1016/j.optlaseng.2024.108618","url":null,"abstract":"<div><div>Laser based directed energy deposition (L-DED) is an additive manufacturing process in which laser energy is used to fuse powder feedstock by melting while being deposited in a layer-by-layer manner, to produce three dimensional (3D) components. The quality of parts produced through this process depends on numerous process parameters. In the present work, the combined effects of defocussing distance, laser power and scanning speed on the geometrical characteristics of single line clads of AISI SS316L stainless steel and H13 tool steel powders produced through L-DED, was investigated. Theoretical analysis of the mutual interactions between laser, powder and substrate was used to explain the variations in clad geometry and deposition behaviour of the two steels. Process parameter maps were developed for the two steels and the influence of defocussing distance on optimal process parameter windows was evaluated. The work demonstrates that laser defocussing distance can be used as a simple but effective method to enhance the flexibility of the deposition process.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108618"},"PeriodicalIF":3.5,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0