2024

• Record 361 of
  
  Title:Design of Tracking Imaging Compound Axial Optical System
  
  Author Full Names:Xu, Tongyu(1,2); Li, Xuyang(1); Ren, Zhiguang(1,2); Wei, Jinyang(1,2); Lu, Zhixian(1,2); Bian, Liguo(1,2); Yao, Kaizhong(1,2)

  Source Title:Guangzi Xuebao/Acta Photonica Sinica

  Language:Chinese

  Document Type:Journal article (JA)

  Abstract:Fast steering mirror with superior positioning accuracy and speed are essential for enhancing secondary image stabilization，which is critical for high-resolution imaging. They help in mitigating the effects of low-frequency vibrations. The continuous advancements in detectors， CPUs， and image processing algorithms have significantly improved the systems' ability to handle higher frame rates and detect image shifts with greater precision. As a result，composite axis optical systems that incorporate these technologies are becoming more adept at reducing image shifts caused by medium and high-frequency vibrations. This progress opens up extensive potential for applications across various fields that require high-precision imaging capabilities. This paper delves into the intricate design of a coaxial common optical path tracking and imaging composite axis optical system，which employs a Fast Steering Mirror（FSM）for secondary image stabilization. The FSM，acting as the actuator responsible for compensating image shifts，benefits from a smaller aperture，which translates into a significant enhancement in its response speed and closed-loop bandwidth. This feature is particularly advantageous in scenarios where rapid and precise adjustments are required to counteract image shifts. In the quest for the optimal front group configuration for the composite axis optical system，the paper conducts a thorough analysis of reflective and catadioptric afocal systems，weighing their respective pros and cons. The selection process culminates in the choice of a catadioptric afocal system，which is capable of achieving a larger beam expansion ratio. This system is particularly well-suited for the front group of the composite axis optical system，given its ability to meet the stringent small aperture requirement of the FSM in the optical path. The catadioptric afocal system is designed to provide a long focal length through a more compact Cassegrain configuration，while the short focal length component is delivered by a transmission system. To address the chromatic aberrations that may be introduced by the lenses，a double cemented lens is employed. Although this approach adds complexity to the optical group compared to a two-mirror system，it becomes a viable solution when the distribution of long and short focal lengths is carefully managed，allowing for a substantial beam expansion ratio. Following the selection of the appropriate front group structure，the paper employs Zemax software to validate the catadioptric afocal optical system. The validation process involves an in-depth analysis of the point spread function and optical distortion，which are obtained by placing a near-axis plane behind the afocal system. The parallel nature of the light emitted by the front group ensures that the defocusing effect caused by the rotation of the FSM remains within an acceptable range，thus minimizing its impact on image quality. Building on the understanding of the mechanism behind image rotation generation，the paper constructs a mathematical model that correlates image rotation with the Modulation Transfer Function （MTF）. MATLAB is then utilized to simulate and analyze the impact of image rotation at various detector positions on the MTF，particularly when the FSM compensates for linear image shifts. This analysis identifies the position at the edge of the field of view where imaging quality is most susceptible to the effects of image rotation. By establishing the relationship between the transfer function and the rear group imaging focal length at the position most affected by image rotation，the paper explores the optimal rear group focal length that would yield the best modulation transfer function across different spatial frequencies. The results demonstrate that the impact of image rotation on image quality can be effectively reduced to an acceptable range，thus validating the theoretical feasibility of achieving secondary image stabilization through the use of a fast steering mirror. In conclusion， this paper not only underscores the theoretical viability of employing fast steering mirrors for secondary image stabilization but also for the design and development of composite axis optical systems that leverage the advantages of small aperture fast steering mirrors. © 2024 Chinese Optical Society. All rights reserved.

  Affiliations:(1) Space Optics Technology Lab, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

  Publication Year:2024

  Volume:53

  Issue:10

  Article Number:1022001

  DOI Link:10.3788/gzxb20245310.1022001

  数据库ID（收录号）:20244717395103
• Record 362 of
  
  Title:Computer-Aided Alignment technology for freeform off-axis four-mirror optical systems
  
  Author Full Names:He, Tian(1); Li, Zhiguo(2); Wang, Li(1); Lei, Yu(2)

  Source Title:Proceedings of SPIE - The International Society for Optical Engineering

  Language:English

  Document Type:Conference article (CA)

  Conference Title:Advanced Optical Manufacturing Technologies and Applications 2024, AOMTA 2024 and 4th International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2024

  Conference Date:July 5, 2024 - July 7, 2024

  Conference Location:Xi'an, China

  Conference Sponsor:Advanced Optical Manufacturing Youth Expert Committee, CSOE; Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Fudan University; University of Shanghai for Science and Technology; Xi'an Institute of Optics and Precision Mechanics of CAS; Xi'an Technological University

  Abstract:Compared to traditional spherical and aspherical surfaces, freeform surfaces offer extensive design freedom, which can be fully utilized to correct and balance asymmetric aberrations, achieving system parameters, structures, and functions that are difficult to realize with conventional optical systems. This has made freeform surfaces a research hotspot in the fields of optical detection and imaging. Currently, freeform surface off-axis reflective systems are widely used in space detection and extreme ultraviolet lithography objective lenses due to their advantages of no obstruction, no ghost images, and a large field of view. This paper focuses on a four-mirror off-axis optical system, studying the alignment methods for such systems. By deeply investigating the relationship between aberration characteristics and misalignment, the aim is to address issues of blind alignment and long assembly cycles associated with traditional methods, thereby providing more precise technical support for optical system assembly. © 2024 SPIE.

  Affiliations:(1) Xi'an University of Technology, Jinhua South Road No. 5, Beilin District, Shaanxi, Xi'an; 710048, China; (2) Xi'an Institute of Optics and Precision Mechanics, CAS, Xi'an Hi-Tech Industrial Development Zone, NO.17 Xinxi Road, Shaanxi, Xi'an; 710119, China

  Publication Year:2024

  Volume:13280

  Article Number:132800K

  DOI Link:10.1117/12.3046862

  数据库ID（收录号）:20244917483519
• Record 363 of
  
  Title:High-Precision Domain Adaptive Detection Method for Noncooperative Spacecraft Based on Optical Sensor Data
  
  Author Full Names:Zhang, Gaopeng(1); Zhang, Zhe(1); Lai, Jiahang(2); Zhang, Guangdong(1); Ye, Hao(1); Yang, Hongtao(1); Cao, Jianzhong(1); Du, Hubing(3); Zhao, Zixin(4); Chen, Weining(1); Lu, Rong(1); Wang, Changqing(2)

  Source Title:IEEE Sensors Journal

  Language:English

  Document Type:Journal article (JA)

  Abstract:The accurate detection of noncooperative spacecraft based on optical sensor data is essential for critical space tasks, such as on-orbit servicing, rendezvous and docking, and debris removal. Traditional object detection methods struggle in the challenging space environment, which includes extreme variations in lighting, occlusions, and differences in image scale. To address this problem, this article proposes a high-precision, deep-learning-based, domain-adaptive detection method specifically tailored for noncooperative spacecraft. The proposed algorithm focuses on two key elements: dataset creation and network structure design. First, we develop a spacecraft image generation algorithm using cycle generative adversarial network (CycleGAN), facilitating seamless conversion between synthetic and real spacecraft images to bridge domain differences. Second, we combine a domain-adversarial neural network with YOLOv5 to create a robust detection model based on multiscale domain adaptation. This approach enhances the YOLOv5 network's ability to learn domain-invariant features from both synthetic and real spacecraft images. The effectiveness of our high-precision domain-adaptive detection method is verified through extensive experimentation. This method enables several novel and significant space applications, such as space rendezvous and docking and on-orbit servicing. © 2001-2012 IEEE.

  Affiliations:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Northwestern Polytechnical University, School of Automation, Xi'an; 710072, China; (3) Xi'an Technological University, School of Mechatronic Engineering, Xi'an; 710021, China; (4) Xi'an Jiaotong University, School of Instrument Science and Technology, Xi'an; 710049, China

  Publication Year:2024

  Volume:24

  Issue:8

  Start Page:13604-13619

  DOI Link:10.1109/JSEN.2024.3370309

  数据库ID（收录号）:20241115731816
• Record 364 of
  
  Title:A Cross-Level Interaction Network Based on Scale-Aware Augmentation for Camouflaged Object Detection
  
  Author Full Names:Ma, Ming(1); Sun, Bangyong(1,2)

  Source Title:IEEE Transactions on Emerging Topics in Computational Intelligence

  Language:English

  Document Type:Journal article (JA)

  Abstract:Camouflaged object detection (COD), with the task of separating the camouflaged object from its color/texture similar background, has been widely used in the fields of medical diagnosis and military reconnaissance. However, the COD task is still a challenging problem due to two main difficulties: large scale-variation for different camouflaged objects, and extreme similarity between the camouflaged object and its background. To address these problems, a cross-level interaction network based on scale-aware augmentation (CINet) for the COD task is proposed. Specifically, a scale-aware augmentation module (SAM) is firstly designed to perceive the scales information of the camouflaged object by calculating an optimal receptive field. Furthermore, a cross-level interaction module (CLIM) is proposed to facilitate the interaction of scale information at all levels, and the context of the feature maps is enriched accordingly. Finally, with the purpose of fully utilizing these features, we design a dual-branch feature decoder (DFD) to strengthen the connection between the predictions at each level. Extensive experiments performed on four COD datasets, e.g., CHAMELEON, CAMO, COD10K, and NC4K, demonstrate the superiority of the proposed CINet compared with 21 existing state-of-the-art methods. © 2017 IEEE.

  Affiliations:(1) Xi'An University of Technology, School of Printing, Packaging and Digital Media, Xi'an; 710048, China; (2) Chinese Academy of Sciences, Key Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Xi'an; 710119, China

  Publication Year:2024

  Volume:8

  Issue:1

  Start Page:69-81

  DOI Link:10.1109/TETCI.2023.3299305

  数据库ID（收录号）:20233414601306
• Record 365 of
  
  Title:Advances in data simulation for space-based situational awareness
  
  Author Full Names:Luo, Xiu-Juan(1,2); Hao, Wei(1,2)

  Source Title:Chinese Optics

  Language:Chinese

  Document Type:Journal article (JA)

  Abstract:The data simulation for Space Situational Awareness (SSA) can provide critical data support for the development, testing, and validation of space surveillance equipment and situational awareness algorithms (including detection, tracking, recognition, and characterization of space object), playing a significant role in building SSA capabilities. Taking the optical data simulation for space-based situational awareness as the research subject, the purpose and main research content of SSA data simulation are presented,and the typical research methods and processes of SSA optical imaging simulation are set forth. The current research status and progress in domestic and foreign related research are introduced, covering the imaging modeling and simulation achievements of different optical sensing systems such as binocular vision sensors, LiDAR, infrared sensors, visible light telescopes, and star trackers. The development trend of SSA data simulation research is analyzed, providing reference for future research ideas and approaches of SSA data simulation. © 2024 Editorial Office of Chinese Optics. All rights reserved.

  Affiliations:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Key Laboratory of Space Precision Measurement Technology, Chinese Academy of Sciences, Xi'an; 710119, China

  Publication Year:2024

  Volume:17

  Issue:3

  Start Page:501-511

  DOI Link:10.37188/CO.2023-0156

  数据库ID（收录号）:20242316214722
• Record 366 of
  
  Title:Enhancing Aircraft Object Detection in Complex Airport Scenes Using Deep Transfer Learning
  
  Author Full Names:Zhong, Dan(1); Li, Tiehu(2); Li, Cheng(3)

  Source Title:Guangzi Xuebao/Acta Photonica Sinica

  Language:Chinese

  Document Type:Journal article (JA)

  Abstract:Within the civil aviation airports of China，intricate traffic scenarios and a substantial flow of traffic are pervasive. Conventional monitoring methodologies，including tower observations and scene reports，manifest vulnerability to potential errors and omissions. Aircraft object detection at airport scenes remains a challenging task in the field of computer vision，particularly in complex environmental conditions. The issues of severe aircraft object occlusion， the dynamic nature of airport environments and the variability in object sizes pose difficulties for accurate object detection tasks. In response to these challenges，we propose an enhanced deep learning model for aircraft object detection at airport scenes. Given the practical constraints of limited hardware computational power at civil aviation airports，the proposed method adopts the ResNet-50 model as the foundational backbone network. After pre-training on publicly available datasets，transfer learning techniques are employed for fine-tuning within the specific target domain of airport scenes. Deep transfer learning methods are utilized to enhance the feature extraction capabilities of the model，ensuring better adaptation to the limited aircraft dataset in airport scenarios. Additionally，we incorporate an adjustment module，consisting of two convolution layers，into the backbone network with a residual structure. The adjustment module can increase the receptive field of deep feature maps and improve the model's robustness. Moreover，the proposed method introduces the Feature Pyramid Network，establishing lateral connections across various stages of ResNet-50 and top-down connections. FPN generates and extracts feature information from multiple scales，facilitating the fusion of features in the feature maps. This enhances the accuracy of multi-scale target detection in the task of object detection. Furthermore，optimizations have been implemented on the detection head，composed of parallel classification and regression branches. This detection head aims to strike a balance between the accuracy and real-time performance of target detection，facilitating the fast and accurate generation of bounding boxes and classification outcomes in the model's output. The loss function incorporates weighted target classification loss and localization loss，with GIoU loss used to calculate the localization loss. Moreover， we construct a comprehensive airport scene dataset named Aeroplane， to evaluate the effectiveness of our proposed model. This dataset encompasses real images of diverse aircraft in various backgrounds and scenes，including challenging weather conditions such as rain，fog，and dust，as well as different times of day like noon，dusk，and night. Most of the color images are captured from the camera equipment deployed in various locations，including terminal buildings，control towers，ground sentry posts and other places of a civil aviation airport surveillance system in China. The diversity of the dataset contributes to enhancing the generalization performance of the model. The Aeroplane dataset is structured adhering to standards and is scalable for future expansion. And we conduct experiments on the Aeroplane dataset. Experimental results demonstrate that our proposed model outperforms classic approaches such as RetinaNet，Inception-V3+FPN，and ResNet-34+FPN. Compared to the baseline method，ResNet-50+FPN， our model achieves a 4.9% improvement in average precision for single-target aircraft detection，a 4.0% improvement for overlapped aircraft detection，and a 4.4% improvement for small target aircraft detection on the Aeroplane dataset. The overall average precision is improved by 2.2%. Through experimental validation，our proposed model has demonstrated significant performance improvement in aircraft target detection within airport scenarios. The presented model exhibits robust scene adaptability in various airport environments，including non-occlusion，occlusion，and complex scenes such as nighttime and foggy weather. This validates its practicality in real-world airport settings. The balanced design of real-time performance and accuracy in our approach renders it feasible for practical applications，providing a reliable aircraft target detection solution for airport surveillance systems and offering valuable insights for the task of object detection. © 2024 Chinese Optical Society. All rights reserved.

  Affiliations:(1) School of Automation, Northwestern Polytechnical University, Xi'an; 710129, China; (2) School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an; 710072, China; (3) Xi'an Institute of Optics and Precision Machinery, Chinese Academy of Sciences, Xi'an; 710119, China

  Publication Year:2024

  Volume:53

  Issue:4

  Article Number:0415002

  DOI Link:10.3788/gzxb20245304.0415002

  数据库ID（收录号）:20241715960809
• Record 367 of
  
  Title:Design and Preparation of Anti-reflection Laser Films on Chalcogenide Glass Substrate
  
  Author Full Names:Wang, Tong(1); Xu, Junqi(1); Li, Yang(1); Su, Junhong(1); Sun, Shaobin(1); Liu, Zheng(2)

  Source Title:Surface Technology

  Language:Chinese

  Document Type:Journal article (JA)

  Abstract:With the development of infrared technology, chalcogenide glass has been used as an infrared optical element to a certain extent, but the transmittance of chalcogenide glass in the 3-5 μm band can not meet the requirements of use, and the infrared thin film for detectors is easily damaged by strong laser irradiation. In order to solve the problems that the optical film plated on chalcogenide glass (As40Se60) substrate is easy to fall off, the transmittance is low, and the laser resistance is poor, the work aims to design and prepare a thin film with good transmittance in the 3-5 μm band and laser resistance at 1 064 nm. The optical constants of ZnSe, ZnS and YbF3 monolayer films were deposited and measured by ion beam-assisted thermal evaporation technology, and the ZnSe film materials were used as the transition layer between the film-groups to improve the film adhesion, and the film system design of infrared anti-reflection laser films was carried out by combining ZnS and YbF3 film materials. The optical constant measured by the above-mentioned single-layer film was input into the TFCalc film design software, and the infrared film with anti-reflection function in the 3-5 μm band and high reflection function at 1 064 nm was optimized on the As40Se60 glass substrate through TFCalc software. The film structure was S | 0.61H0.21L0.32M0.26L-0.2M0.32L0.28M0.17L0.35M0.28L0.13M0.61L|A, of which H represented ZnSe material, M represented ZnS material, L represented YbF3 material, S represented chalcogenide glass and A represented air, and the design wavelength of the film system was 4 000 nm. The thin film layer thickness was 2 055 nm and the theoretical design spectral performance of the film was as follows: the average transmittance of double-sided coating samples in the range of 3-5 μm was 95.67%, the peak transmittance was 99.11%, and the average transmittance of single-sided coating samples in the range of (1 064±40) nm was 7.62%. The preparation of thin films was carried out by ion beam-assisted thermal evaporation technology, and the process parameters were optimized from the large difference in thermal expansion coefficient between chalcogenized glass and film materials. The optimized process parameters were: baking temperature of 70 ℃, ion energy of 100 eV, ion beam of 20 mA. Under these parameters, the residual stress of the thin film sample was −30.0 MPa and Zygo laser interferometer was used to test the surface shape before and after coating. The adhesion performance of the prepared film met the requirements. The average transmittance of the film was 95.38% and the peak transmittance was 99.07% when the film was coated on both sides in the 3-5 μm band. The average transmittance was 4.46% when the film was coated on one side in the range of (1 064±40) nm, and the laser damage threshold at 1 064 nm was 7.6 J/cm2. When a film is prepared on the chalcogenide glass substrate, starting from the difference in the thermal expansion coefficient between the glass itself and the film material, the process parameters such as baking temperature and ion parameters can be reasonably optimized, which can reduce the residual stress of the film and improve the adhesion performance of the film on the chalcogenide glass substrate. © 2024 Chongqing Wujiu Periodicals Press. All rights reserved.

  Affiliations:(1) Shaanxi Province Key Laboratory of Thin Films Technology and Optical Test, Xi'an Technological University, Xi'an; 710021, China; (2) Joint Laboratory of Advanced Optical Manufacturing Technology, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

  Publication Year:2024

  Volume:53

  Issue:12

  Start Page:252-259

  DOI Link:10.16490/j.cnki.issn.1001-3660.2024.12.021

  数据库ID（收录号）:20243016746299
• Record 368 of
  
  Title:Experimental study on the implementation method of short pulse laser in distance-selective imaging system
  
  Author Full Names:Wang, Chong(1); Li, Miaomiao(1); Yang, Jiahao(1); Zhu, Bingli(2); Han, Jianghao(1); Dang, Wenbin(1)

  Source Title:Optics and Laser Technology

  Language:English

  Document Type:Journal article (JA)

  Abstract:Conventional distance-selective imaging systems use lasers that are large in size, high in power consumption, and high in cost. In order to reduce the system size and reduce the system power consumption and cost, The principles and design methods of two drive circuits for generating narrow pulse lasers based on step recovery diodes SRD (combined with shorted transmission lines) and RF bipolar transistors are discussed, physically fabricated and tested, and the characteristics of the two pulse generators and the factors affecting the pulse width amplitude are analyzed. The experimental results show that the SRD-based method can generate a narrow pulse with a rise time of 456.8 ps, a fall time of 458.3 ps, a pulse width of 1.5 ns, and an amplitude of 2.38 V; the transistor-based method can generate a narrow pulse with a rise time of 903.5 ps, a fall time of 946.1 ps, a pulse width of 824 ps, and an amplitude of 2.46 V, both of which can reach a repetition frequency of 50 MHz. Both design methods can be combined with an external laser diode to achieve excellent short pulse laser output. © 2023

  Affiliations:(1) School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an; 710121, China; (2) Xi'an Institute of Optical Precision Machinery, Chinese Academy of Sciences Key Laboratory of Ultrafast Diagnostic Technology, Chinese Academy of Sciences, Xi'an; 710119, China

  Publication Year:2024

  Volume:171

  Article Number:110358

  DOI Link:10.1016/j.optlastec.2023.110358

  数据库ID（收录号）:20234815126167
• Record 369 of
  
  Title:Design of Compact Large Field Off-axis Three-mirror Space Optical System Based on Freeform Surface
  
  Author Full Names:Lu, Zhixian(1,2); Li, Xuyang(1); Ren, Zhiguang(1,2); Xu, Tongyu(1,2); Bian, Liguo(1,2); Wei, Jinyang(1,2); Yao, Kaizhong(1,2)

  Source Title:Guangzi Xuebao/Acta Photonica Sinica

  Language:Chinese

  Document Type:Journal article (JA)

  Abstract:In the realm of modern space exploration and remote sensing technology，reflective optical systems play an indispensable role. These systems are distinguished by their absence of chromatic aberration， broad operational bandwidth， effective stray light suppression， and their capacity for lightweight and compact design compared to transmissive systems. These attributes confer significant advantages in the application of space cameras. Particularly under the demands for high resolution and wide field of view，reflective optical systems emerge as the preferred choice due to their unique benefits. In an effort to diminish the physical footprint of space optical systems and reduce the associated costs of launching remote sensing satellites，this paper delineates the formulation of the initial structure for such a system，grounded in the principles of primary aberration theory. This research presents the design of an innovative off-axis three-mirror optical system characterized by an"annular contour"，facilitated through a methodical，gradual optimization strategy concentrating on the field of view and surface morphology. The proposed system boasts a focal length of 2 000 mm，a field of view spanning 5°×5°，an F-number of 12.5，and an external envelope circle diameter measuring 750 mm. Integral to this design is the employment of XY polynomial freeform surfaces for the primary and tertiary mirrors，and Zernike polynomial freeform surfaces for the secondary mirror. These selections were motivated by their capacity to minimize aberrations and enhance the system's imaging performance. By applying the surface shape parameters of these freeform surfaces，we conducted simulations to generate two-dimensional sagittal height maps for each of the three mirrors，thus facilitating a rigorous analysis of the optical system's theoretical capabilities. The results from this design process indicate that the imaging quality of the system aligns closely with the diffraction limit. Specifically，the maximum Root Mean Square（RMS）spot diameter across all fields was recorded at 8.38 μm，thereby falling beneath the threshold of twice the pixel size of the targeted detector. This level of performance signifies not only the system's acute resolution capabilities but also its potential for high-fidelity image capture，crucial for remote sensing applications. Furthermore，the system demonstrates a significant degree of energy concentration，with a maximum relative distortion measure of 1.88%，and a maximum wavefront error marked at 0.053λ. Impressively，the wavefront error across all visual fields remains superior to λ/18，thereby underscoring the system's exceptional optical performance and its alignment with stringent imaging standards. The completion of a tolerance analysis further corroborates the robustness of the system's imaging quality，affirming its capacity to fulfill the requisite performance metrics under a variety of operational conditions. This level of reliability is pivotal，especially given the harsh environments and the demanding nature of space deployments. The development of this compact，cost-effective off-axis three-mirror optical system represents a significant leap forward in the field of space optics，particularly for applications in remote sensing. By harnessing advanced optical design principles and leveraging the unique advantages of freeform surfaces，this study not only achieves remarkable improvements in system compactness and performance but also lays a solid foundation for future innovations in satellite imaging technology. The methodologies and insights gleaned from this research may well inform the design and optimization of next-generation space optical systems，driving further advancements in earth observation，environmental monitoring，and beyond. © 2024 Chinese Optical Society. All rights reserved.

  Affiliations:(1) Space Optics Technology Lab, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (2) University of Chinese Academy of Science, Beijing; 100049, China

  Publication Year:2024

  Volume:53

  Issue:9

  Article Number:0922002

  DOI Link:10.3788/gzxb20245309.0922002

  数据库ID（收录号）:20244117178785
• Record 370 of
  
  Title:Station Planning Method for Multi-sensor System Collaborative Measurement Field
  
  Author Full Names:Lin, Xuezhu(1,2); Wang, Dexuan(1); Fu, Xihong(3,4); Yang, Fan(3); Guo, Lili(1,2); Yan, Dongming(1); Li, Lijuan(1,2)

  Source Title:Guangzi Xuebao/Acta Photonica Sinica

  Language:Chinese

  Document Type:Journal article (JA)

  Abstract:With the continuous development and technological advances in the modern industrial field，large component measurement techniques are becoming increasingly important in various fields. Particularly in areas such as large machinery and equipment，aerospace，etc.，accurately measuring and evaluating the dimensions and shapes of parts，components，and systems is critical to ensuring product quality，meeting design requirements，and ensuring safety. Among them，station planning plays a key role in large component measurement tasks，and it directly affects the overall accuracy and efficiency of the entire measurement task. Currently，the station planning of large component measurement often relies on experienced surveyors，which leads to an increase in the time and labor cost of the measurement and the instability of the measurement results. Secondly，the traditional method of station planning for large component measurement is often time-consuming and inefficient，lacks theoretical basis and evaluation methods，and is prone to problems such as large number of stations，high number of station transfers and low measurement efficiency，which can not meet the needs of modern manufacturing industry for fast and efficient measurement. In view of the above-mentioned large-scale component multi-sensing system station planning，due to the diversification of system measurement accessibility models and the imbalance of multi-system measurement accuracy，the combined measurement station setting relies heavily on the experience of surveyors and continuous attempts to obtain suitable stations. To solve the problem，this paper proposes a combined measurement station planning method for multi-sensor systems. Firstly，considering the tooling occlusion issue，based on the combined measurement accessibility model in the collaborative measurement field，we establish an initial value solving model for tooling-affected station positions using the Remora optimization algorithm. This model calculates the initial values of measurement stations in the combined measurement system；secondly，addressing the precision constraint issue，we establish a collaborative measurement accuracy model. We formulate an optimization objective function that minimizes the weighted residual values of the observation data and the vector angular measurement errors. We optimize the scaling factor to achieve the best accuracy in station coordinates；finally，a certain target simulator satisfies the position，posture initial assembly and adjustment accuracy requirements are taken as an example. A combined measurement station planning experiment was conducted. The root mean square error of the measurement data after optimization is 0.032 mm. Compared with the measurement planning before optimization，the position measurement accuracy increased by 34%，and the angle measurement accuracy increased by 9.5 % . This method provides improvements in methods for the rapid and precise detection as well as station planning efficiency of components，parts，and systems in large-scale structures. It offers valuable references for further research and applications in the field of measurement. © 2024 Chinese Optical Society. All rights reserved.

  Affiliations:(1) Key Laboratory of Optoelectronic Measurement and Control and Optical Information Transmission Technology, Ministry of Education, College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun; 130022, China; (2) Zhongshan Institute, Changchun University of Science and Technology, Zhongshan; 528437, China; (3) Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (4) University of Chinese Academy of Sciences, Beijing; 101408, China

  Publication Year:2024

  Volume:53

  Issue:8

  Article Number:0812001

  DOI Link:10.3788/gzxb20245308.0812001

  数据库ID（收录号）:20243917112601
• Record 371 of
  
  Title:Auto-Alignment Non-Contact Optical Measurement Method for Quantifying Wobble Error of a Theodolite on a Vehicle-Mounted Platform
  
  Author Full Names:Li, Xiangyu(1,2,3); Hao, Wei(1,3); Xie, Meilin(1,3); Liu, Bo(1,3); Jiang, Bo(1,3); Lv, Tao(1,2,3); Song, Wei(1,2,3); Ruan, Ping(1,3)

  Source Title:Tehnicki Vjesnik

  Language:English

  Document Type:Journal article (JA)

  Abstract:During non-landing measurements of a theodolite, the accuracy of the goniometric readings can be compromised by wobble errors induced by various factors such as wind loads, theodolite driving torque, and the stiffness of the supporting structure. To achieve high-precision non-landing measurements, it is essential to accurately determine and correct the platform wobble errors affecting the azimuth and pitch pointing angles. In this paper, a non-contact optical measurement method is proposed for quantifying platform wobble errors. The method establishes an auto-alignment optical path between an autocollimator and a reflector in the measuring device. By detecting the deviation angle of the CCD image point as the optical path changes, precise measurements of the platform wobble errors can be obtained. Experimental results demonstrate that the measuring device can achieve an auto-alignment optical path within 5 minutes, significantly improving measurement efficiency. Furthermore, after measuring the platform wobble error and applying data correction, the average error in the azimuth pointing angle is reduced from 31.5″ to 9.8″, and the average error in the pitch pointing angle is reduced from 21″ to 9.2″. These results highlight the substantial correction effect achieved by the proposed method. © 2024, Strojarski Facultet. All rights reserved.

  Affiliations:(1) Key Laboratory of Space Precision Measurement Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Xi'an Hi-Tech Industrial Development Zone, NO.17 Xinxi Road, New Industrial Park, Shaanxi, Xi'an; 710119, China

  Publication Year:2024

  Volume:31

  Issue:2

  Start Page:449-459

  DOI Link:10.17559/TV-20230510000617

  数据库ID（收录号）:20241115717961
• Record 372 of
  
  Title:Rotating dual-retarders to correct polarization measurement error for division-of-amplitude polarimeter in full field of view
  
  Author Full Names:Jia, Wentao(1,2); Liu, Kai(1,2); Jiang, Kai(1,2); Shan, Qiusha(1,2); Duan, Jing(1,2); Wu, Linghao(3); Zhou, Liang(1,2)

  Source Title:Optics and Lasers in Engineering

  Language:English

  Document Type:Journal article (JA)

  Abstract:The division-of-amplitude polarimeter (DoAP) can measure the four Stokes parameters simultaneously, and has the advantages of snapshot and high spatial resolution. However, the residual polarization aberration (PA) of DoPA system can lead to the polarization measurement error, which is influenced by the field of view. In this paper, the relationship between the measurement errors of Stokes parameters and the Mueller pupil is derived, and the Mueller pupil of DoPA system is obtained by 3D polarization ray-tracing matrix. Then, a method of dual-retarders rotation is proposed to correct the Mueller pupil in full field of view. The simulation demonstrates the PA correction can improve the measurement accuracy of DoPA system, and the measurement error of degree of linear polarization is reduced by 11.5 %, 38.2 % and 11.8 % at 0°, 10° and 15° field of view, respectively. This research facilitates the precise measurement of polarization signals for polarimeters. © 2024 Elsevier Ltd

  Affiliations:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Key Laboratory of space Precision Measurement Technology, Xi'an; 710119, China; (3) Changzhou Institute of Technology, Changzhou; 213002, China

  Publication Year:2024

  Volume:181

  Article Number:108360

  DOI Link:10.1016/j.optlaseng.2024.108360

  数据库ID（收录号）:20242416245015