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Optics and Precision Engineering

Optics and Precision Engineering Optics and Precision Engineering
  • Editor-in-Chief:Xuejun Zhang, Liangcai Cao
  • ISSN:1004-924X
  • eISSN:2097-3209
  • CN:22-1198/TH
  • Supervisor:Chinese Academy of Sciences
  • Sponsor:Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, China Instrument and Control Society
  • Publication frequency:Semimonthly
  • Tel.:0431-86176855
  • E-mail:gxjmgc@ciomp.ac.cn
  • Address:No.3888 Dong Nanhu Road, Changchun, Jilin, China
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Volume 33 期 19，2025 2025年第33卷第19期

  • Modern Applied Optics

    WANG Huanqing, HAN Yusheng, XUE Mogen, WANG Feng, HUANG Qinchao

    DOI：10.37188/OPE.20253319.3009
    摘要：To improve target positioning accuracy in UAV-based electro-optical imaging and to inform localization methodology and system design， an electro-optical imaging target localization model is developed. Spatial geometric positioning is performed via coordinate transformation， and error sensitivity is quantified using error synthesis theory. Model accuracy is evaluated through Monte Carlo simulations combined with experimental measurements， with emphasis on the coupling effects of angular positioning errors. Monte Carlo results indicate that， as the number of measurements increases， positioning errors in the geodetic Cartesian coordinate system converge to a normal distribution with zero mean. The spatial positioning error is reduced from 18.71 m for a single measurement to 0.28 m with multiple measurements， approaching the actual measurement value. Analysis of accuracy-influencing factors shows that the effects of positioning and ranging errors are predominantly determined by their magnitudes， whereas the impacts of angular and attitude errors are also strongly dependent on the measurement state. This study therefore quantifies the coupling of multi-source heterogeneous errors， clarifies the mechanisms by which distinct error sources affect positioning accuracy， and provides a theoretical foundation for developing error suppression strategies in UAV electro-optical imaging localization， thereby contributing to improved target positioning and measurement precision.  
    关键词：photoelectric imaging localization;positioning accuracy;target localization model;error analysis   
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    更新时间：2025-11-03

    DONG Ye, REN Shuxuan, WANG Zhibin, WANG Shuang, LI Kewu

    DOI：10.37188/OPE.20253319.3021
    摘要：To achieve rapid and precise birefringence microscopy， a photoelastic-modulation-based imaging scheme is proposed. Leveraging the high modulation frequency and purity of photoelastic modulators， birefringence imaging measurements are realized. The disparity between the modulator's high-frequency operation and the camera's low frame rate is resolved via stroboscopic illumination. The sample's birefringence phase retardation distribution is retrieved from only three images acquired at photoelastic modulation phases of 0°， 30°， and 90°. An experimental system was constructed and tested on a wave plate and linden stem sections. Results indicate a wave-plate retardation error below 1%， retardation accuracy within ±λ/300， and a maximum retardation-distribution deviation not exceeding 1.62 nm. Distinct retardation regions in the linden stem sections enabled differentiation of anatomical parts， with single-measurement acquisition time under 3 ms. The method achieves high-speed， high-precision mapping of birefringence phase retardation and offers an advanced technical approach for studies of two-dimensional materials， biological tissue imaging， and related fields.  
    关键词：microscopy imaging;polarization modulation;stroboscopic illumination;phase retardation;birefringence   
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    更新时间：2025-11-03

    ZHU Fangyin, LIN Ruitao, WANG Bin, JIANG Erlong, ZHAO Nan, ZHOU Wenwen, ZHENG Shaofeng, LI Jiaming, ZHANG Qingmao

    DOI：10.37188/OPE.20253319.3032
    摘要：Traditional laser-induced breakdown spectroscopy （LIBS） employing low-repetition-rate solid-state lasers exhibits insufficient stability during extended continuous operation. Although fiber-laser-induced breakdown spectroscopy （FL-LIBS） offers superior long-term stability， its high repetition rate poses challenges for conventional quantitative approaches， which typically rely on time-integrated spectra and calibration with reference samples. To remove dependence on reference standards， a high-speed， high-repetition-frequency triggered-gating system was implemented on an FL-LIBS platform to capture transient plasma spectra. A calibration-free quantitative analysis algorithm was developed， and the Internal Reference Self-absorption Correction （IRSAC） method was improved to compensate for spectral self-absorption， thereby enhancing the accuracy of calibration-free quantification. Experimental results for TC4 titanium alloy indicate total analysis distance errors （DE） ranging from 0.883% to 3.928%（mass fraction）， corresponding to reductions of 16.879% to 26.597 %（mass fraction） relative to uncorrected self-absorption. These findings demonstrate that high-accuracy calibration-free quantitative analysis can be achieved under high-repetition-frequency fiber laser ablation， offering a viable approach for LIBS systems that require prolonged continuous operation.  
    关键词：laser induced breakdown spectroscopy;fiber laser;quantitative analysis;self-absorption effect;calibration-free method   
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    更新时间：2025-11-03

    HUANG Yunpeng, LI Yang, QIU Qifan, DONG Dengfeng, GAO Doudou, JIANG Xingjian, CUI Chengjun, ZHOU Weihu

    DOI：10.37188/OPE.20253319.3043
    摘要：In response to the need for high-precision geometric feature measurement under complex intervisibility conditions in large-scale advanced precision manufacturing， a hidden-point coordinate measurement method based on inertial-visual fused attitude estimation is proposed. The system architecture and measurement principles for hidden-point coordinate determination are analyzed， and Monte Carlo simulations are conducted to identify the principal factors influencing measurement uncertainty. An attitude-fusion approach employing spherical linear interpolation （slerp） for quaternions is introduced to optimize interpolation paths during quaternion fusion， addressing challenges associated with attitude interpolation. On this basis， an inertial–visual fused attitude estimation algorithm is developed. Calibration procedures for the parameters of the hidden-point measurement system are then formulated. An experimental setup is implemented to validate the effectiveness and reliability of the proposed method through parameter calibration and hidden-point coordinate measurement experiments. Experimental results indicate that the repeated calibration deviation of the coordinate transformation matrix remains below 0.03°， and the repeated calibration deviation of the structural parameter of the hidden-point target remains below 45 μm， confirming the stability and reliability of the calibration procedures. Based on the calibration results， the inertial–visual fusion method reduces the mean hidden-point coordinate measurement error by 60.63% relative to the monocular-vision method， with the maximum spatial coordinate error kept within 130 μm over a 10 m range. These findings demonstrate that the proposed method meets the geometric measurement requirements of typical high-precision manufacturing environments and exhibits substantial practical potential.  
    关键词：monocular vision;hidden point coordinate measurement;inertial measurement unit;fused attitude estimation   
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    更新时间：2025-11-03
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