Optics and Lasers in Engineering最新文献

{"title":"High-speed active vision pose perception and tracking method based on Pan-Tilt mirrors for 6-DOF dynamic projection mapping","authors":"Shuangjiang Huang ,&nbsp;Fengnian Song ,&nbsp;Lihui Wang ,&nbsp;Yutao Huang ,&nbsp;Yuan He ,&nbsp;Shi Bai ,&nbsp;Tao Chen ,&nbsp;Masatoshi Ishikawa","doi":"10.1016/j.optlaseng.2025.108888","DOIUrl":"10.1016/j.optlaseng.2025.108888","url":null,"abstract":"<div><div>Active vision tracking projection mapping technology holds promise for augmented reality, autonomous driving, and robot navigation. However, it performs suboptimally with high-speed, randomly moving targets due to the difficulty in synchronizing accurate pose perception and high-dynamic vision tracking across a large field of view. Therefore, we proposed a high-speed active vision pose perception and tracking method for 6 degree-of-freedom (DOF) dynamic projection mapping. We designed a tracking method for an optical active vision system based on a Pan-Tilt mirror, which blends a pupil drift optical module field of view enhancement module and a Pan-Tilt optical axis control design, to achieve feedback control tracking of high-speed moving targets. The experimental results show that the tracking errors in the x and y directions are less than 25 pixels, and the maximum response time of the system is less than 5 ms. The projection position error is not more than 61.9 mm, and the rotation error is less than 4^∘. This method effectively achieves 6-DOF dynamic projection of high-speed moving targets, exhibiting enhanced accuracy and responsiveness in dynamic scenarios.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"188 ","pages":"Article 108888"},"PeriodicalIF":3.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444819","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}

{"title":"Development of high sensitivity shore-based laser induced fluorescence radar and its application in high-precision online monitoring of chlorophyll concentration","authors":"Yunfei Li ,&nbsp;Yanhu Fu ,&nbsp;Wanning Yi ,&nbsp;Yilin Zhao ,&nbsp;Yu-ze Song ,&nbsp;Fuhong Cai","doi":"10.1016/j.optlaseng.2025.108883","DOIUrl":"10.1016/j.optlaseng.2025.108883","url":null,"abstract":"<div><div>Monitoring aquatic chlorophyll is essential for environmental observation and the conservation of natural ecosystems, especially concerning the water quality in regions like lakefronts and coastlines, which are closely interrelated human activities. The development of shore-based devices capable of conducting high-frequency, high-precision, and automated chlorophyll detection is crucial. Optical sensing technology, distinguished by its exceptional specificity, sensitivity, and detection accuracy, is widely used in the field of water monitoring, involving the applications of reflectance and fluorescence spectral detection. Passive spectra detection can be affected by irregular variations in natural illumination, which needs to be corrected through calibration algorithms. Furthermore, water surface undulating and aquatic substances that can produce fluorescence besides chlorophyll can influence the original detection signal, increasing the complexity of the data processing. To overcome the above issues, this work presents a triple-mode shore-based sensing instrument. As the core of the system, the laser-induced fluorescence spectroscopy remote sensing system (LIFSRS) include active laser and imaging spectrometer with high sensitivity and excellent signal-to-noise ratio, along with an unsupervised processing algorithm. Its common path design ensures an accurate detection distance between detection systems and surface, while the compact transmissive diffraction configuration greatly minimize optical distortion due to the large detection aperture with in the imaging spectrometer. This setup effectively mitigates interference from extraneous fluorescence in the water without the need to subtract background fluorescence. The unsupervised algorithm demonstrates significant robustness and adaptability, capable of correcting the acquired fluorescence spectra based on the incident angle and detection distance. In addition, the instrument integrates a thermal imaging module and a millimeter wave radar module for bio-detection as well as for acquiring water surface temperature and altitude. Consequently, the system has been deployed at various locations across two cities, enabling the accurate acquisition of chlorophyll fluorescence concentrations in natural water bodies without the need for supervision. The detection time for a single measurement is 200 milliseconds, with the overall error percentage being minimal 15 %.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"187 ","pages":"Article 108883"},"PeriodicalIF":3.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437368","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}

{"title":"Comparative performance of DIC and optical flow algorithms for displacement and strain analysis in laser beam welding","authors":"Viktor Savitsky ,&nbsp;Lennart Schmies ,&nbsp;Andrey Gumenyuk ,&nbsp;Michael Rehtmeier","doi":"10.1016/j.optlaseng.2025.108870","DOIUrl":"10.1016/j.optlaseng.2025.108870","url":null,"abstract":"<div><div>The measurement of strain and displacement in the context of the welding process represents a significant challenge. Optical methods, such as digital image correlation (DIC) or optical flow algorithms, have demonstrated their efficacy in robust and reliable data acquisition in harsh environments, including those encountered in welding processes. Concurrently, a trade-off between the accuracy of the measurement and the computational resources required for the associated calculations must be evaluated on a case-by-case basis. The application of filters to initial images represents a technique that serves to enhance the quality and accuracy of the strain and displacement prediction. In the present study, the estimated error of two algorithms, namely the Lucas-Kanade (LK) and the inverse compositional Gauss-Newton (IC-GN), is compared on the basis of both synthetic and real welding images. The displacement field is evaluated for different zones in the laser weld seam with varying contrast performance. Based on the aforementioned results, a strain calculation was conducted for both methods, which yielded comparable results for the LK and IC-GN algorithms</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"187 ","pages":"Article 108870"},"PeriodicalIF":3.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437367","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}

{"title":"CFRP delamination defect detection by dynamic scanning thermography based on infrared feature reconstruction","authors":"Haoze Chen ,&nbsp;Jie Gao ,&nbsp;Zhijie Zhang ,&nbsp;Wuliang Yin ,&nbsp;Ningchen Dong ,&nbsp;Guangyu Zhou ,&nbsp;Zong Meng","doi":"10.1016/j.optlaseng.2025.108884","DOIUrl":"10.1016/j.optlaseng.2025.108884","url":null,"abstract":"<div><div>Shape information detection and evaluation of internal delamination defects in carbon fiber reinforced polymers (CFRP) is of great importance in industrial production and applications. In this paper, a new method for imaging and edge detection of internal delamination defects in CFRP using continuous line laser scanning excitation thermography is proposed. Firstly, a Following Laser Scanning Thermography (FLST) system is set up in the form of a heat source and camera that are stationary and the test piece is moving. It can perform fast and high-precision nondestructive testing of large workpieces. Subsequently, the advantages of FLST are utilized to reconstruct the infrared images of defects by simple feature lines, and the effects of different parameters on the reconstructed images are analyzed. Finally, the morphological information characterization of internal delamination defects in CFRP is realized by motion blur removal method combined with edge detection algorithm. The results demonstrate that the use of FLST system, combined with image reconstruction and motion blur removal method has high accuracy and efficiency in the non-destructive testing and evaluation of delamination defects.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"187 ","pages":"Article 108884"},"PeriodicalIF":3.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445731","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}

{"title":"Holographically marked metasurface towards multi-user authentication","authors":"Shangying Zhou,&nbsp;Sheng Wang,&nbsp;Zhenyu Zhang,&nbsp;Bijun Xu,&nbsp;Xiaogang Wang","doi":"10.1016/j.optlaseng.2025.108836","DOIUrl":"10.1016/j.optlaseng.2025.108836","url":null,"abstract":"<div><div>Metasurface-based image encryption is becoming an increasingly prevalent trend in optical security; yet, limited attention has been directed towards metasurface-based image authentication. Here, we present a holographically marked metasurface for multi-user authentication based on polarization multiplexing technology. Through embedding a holographic marker in the metasurface via a different polarization channel, it simplifies the distinction between different metasurfaces, while simultaneously achieving multi-user authentication. In the authentication process, only by applying the correct authentication keys to the metasurface can the verifiable images be reconstructed. Computer simulation results confirm the feasibility and security of the proposed metasurface-based security approach.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"186 ","pages":"Article 108836"},"PeriodicalIF":3.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438014","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}

{"title":"High-throughput compact Raman spectrometer based on polarization transformation: Development and biological trials","authors":"Hao Peng ,&nbsp;Yu Wang ,&nbsp;Lindong Shang ,&nbsp;Xiaodong Bao ,&nbsp;Kunxiang Liu ,&nbsp;Xusheng Tang ,&nbsp;Yuntong Wang ,&nbsp;Dongyang Xiao ,&nbsp;Peng Liang ,&nbsp;Bei Li","doi":"10.1016/j.optlaseng.2025.108880","DOIUrl":"10.1016/j.optlaseng.2025.108880","url":null,"abstract":"<div><div>As Raman spectroscopy is applied to the detection of weak signals, such as in the field of microorganism analysis, the optimization of spectrometer systems that can overcome grating polarization dependency and enhance diffraction efficiency becomes increasingly important. To address these limitations, we proposed a method that combines the polarization state transformation technique with a pulse compression grating (PCG) that exhibits high diffraction efficiency for a particular polarization state. This method not only eliminates the polarization dependence but also significantly improves the overall diffraction efficiency, enabling a remarkable spectrometer throughput of over 84 %. Additionally, we introduced a method to improve the spectral resolution based on the grating anamorphic amplification effect, achieving a 3.7 cm^-1 average spectral resolution while miniaturizing the spectrometer, and <em>Escherichia coli</em> colonies were tested to verify the performance of the whole system. Our research contributes to advancing the development of Raman spectrometers towards higher throughput, higher resolution, and miniaturization, enabling their application in a broader range of scenarios.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"187 ","pages":"Article 108880"},"PeriodicalIF":3.5,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437366","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}

{"title":"Large-format grating groove density measurement method based on optical interferometry","authors":"Yujia Sun ,&nbsp;Wenyuan Zhou ,&nbsp;Zhaowu Liu ,&nbsp;Wenhao Li ,&nbsp;Shan Jiang ,&nbsp;Lin Liu ,&nbsp;Yanxiu Jiang ,&nbsp;Weicheng Wang","doi":"10.1016/j.optlaseng.2025.108885","DOIUrl":"10.1016/j.optlaseng.2025.108885","url":null,"abstract":"<div><div>In this research, an optical interference large-format grating groove density measurement method is proposed. The dual-frequency laser emits two beams of light to the test grating at Littrow Angle. The phase information of the test grating is obtained through the interference of the two diffracted light beams. Therefore, the groove density of the test grating can be calculated by the actual displacement value of the moving grating, according to the grating heterodyne measurement technology and laser interferometry technology. A system was built to verify the feasibility of the proposed method. The experimental results demonstrate that this method is capable of detecting the groove density of gratings ranging from 500 gr/mm to 3000 gr/mm in any region of the entire format, with the repetitive precision exceeding 0.01 gr/mm, and the uniformity repetitive precision surpassing 0.1 gr/mm. This method provides an effective means for fast and high-precision measurement of grating groove density.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"187 ","pages":"Article 108885"},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428913","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}

{"title":"A Fano resonance electro-optic modulator with high modulation efficiency in photonic multiplying","authors":"Yingjie Xu ,&nbsp;Lidan Lu ,&nbsp;Bofei Zhu ,&nbsp;Guang Chen ,&nbsp;Jie Liao ,&nbsp;Jin Zhang ,&nbsp;Mingli Dong ,&nbsp;Lianqing Zhu","doi":"10.1016/j.optlaseng.2025.108886","DOIUrl":"10.1016/j.optlaseng.2025.108886","url":null,"abstract":"<div><div>In recent years, the high-performance modulator has been widely focused in photonic computing. However, the low modulation efficiency of modulators is one of severe obstacles for applications in photonic chips. Fano resonance can improve the modulation efficiency thanks to high linearity at resonance wavelength. In this work, we demonstrate a silicon modulator with modulation depth of 13.14 dB based on Fano resonance. Only 0.34 nm is needed to tune the resonant wavelength to achieve the adjusting of optical intensity from minimum to maximum. Moreover, high modulation efficiency of 0.31 V·cm and the ratio of optical intensity to modulation voltage of 3.58 dB/V at resonant wavelength have been achieved. Overall, due to the high performance of our Fano resonance modulator, it has broad application potential for the photonic neural network and convolutional operation as well as optical computing chips in future.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"187 ","pages":"Article 108886"},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437365","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}

{"title":"Artifact reduction in rotational computed laminography using a deep learning method","authors":"Xiang Zou ,&nbsp;Wuliang Shi ,&nbsp;Muge Du ,&nbsp;Yuxiang Xing","doi":"10.1016/j.optlaseng.2025.108881","DOIUrl":"10.1016/j.optlaseng.2025.108881","url":null,"abstract":"<div><div>Computed laminography (CL) is widely used in imaging plate-like object. Due to lacking projection data along non-thickness direction, images reconstructed from CL contain severe interlayer aliasing artifacts. These artifacts can greatly affect later object identification and information extraction from the CL images, restricting their utility value. To reduce aliasing artifact in CL, we develop a deep learning method to post-process the FDK-reconstructed image. Firstly, we analyze the characteristics of aliasing artifacts in CL images. Based on that, a modified U-Net convolutional neural network (CNN), which takes 2.5D radial slice as input, is proposed. Then, the effectiveness of the proposed method is tested and compared with other strategies, including the methods using 2D (<em>z</em> direction, <em>x</em> direction, and radical direction) slice and 2.5D (<em>z</em> direction, <em>x</em> direction) slice as input. Experimental results on ball grid array (BGA) specimens shows that the proposed method give the best performance in the CL aliasing artifact reduction in all comparison strategies.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"187 ","pages":"Article 108881"},"PeriodicalIF":3.5,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421527","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}

{"title":"Hybrid algorithm for image denoising of mixed speckle-impulse noise in planar laser-induced fluorescence (PLIF) imaging","authors":"Mohsen Mirzaei ,&nbsp;Yejun Wang ,&nbsp;Qiu Wang ,&nbsp;Chenglong Guo ,&nbsp;Pan Li ,&nbsp;Wei Zhao","doi":"10.1016/j.optlaseng.2025.108877","DOIUrl":"10.1016/j.optlaseng.2025.108877","url":null,"abstract":"<div><div>Flow visualization is essential for a comprehensive understanding of complex fluid dynamics. Planar laser-induced fluorescence (PLIF) has emerged as one of the most promising techniques for multi-dimensional imaging acquisition, offering high spatial and temporal resolutions. However, PLIF images frequently suffer from impulse and speckle noise under low-density, low-pressure conditions, thereby affecting the quality of visualization. This study proposes a novel hybrid algorithm that integrates order-statistic and non-local means filters with residue feedback. The algorithm enhances image quality and eliminates noise effectively by incorporating recursive processes guided by the structural similarity index (SSIM) and anisotropic diffusion. The efficacy of the method is confirmed through evaluation using peak signal-to-noise ratio (PSNR) and SSIM on images with varying noise levels. The algorithm demonstrates computational efficiency and shows promise for denoising PLIF images.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"187 ","pages":"Article 108877"},"PeriodicalIF":3.5,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403557","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}