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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 34 期 7，2026 2026年第34卷第7期

  • Modern Applied Optics

    SHAO Fuhai, ZENG Xuefeng, LI Wenyan, WANG Lingjie, ZHANG Xuejun

    DOI：10.37188/OPE.20263407.1035
    摘要：Laser tracking measurement networks are widely employed for high-precision three-dimensional positioning， where accurate calibration of system parameters is essential for reliable results. Conventional network self-calibration methods often suffer from unstable geometric references， and the adjustment results are highly sensitive to initial values. An optimized adjustment method for laser tracking measurement networks is proposed. Oriented point models are introduced to provide multiple spatial references， enabling self-calibration of measurement station coordinates. During network adjustment， the coordinates of the oriented points are fixed， allowing joint optimization of all station coordinates under a unified geometric reference. The proposed method is based on the NASC model， in which rigid geometric constraints are imposed to enhance solution stability. Simulation experiments incorporating Gaussian noise in distance and point measurements demonstrate that stable solutions are achieved， with edge length errors controlled at the micrometer level. Practical validation was conducted using a one-meter standard rod. The proposed method was compared with the commercial software Spatial Analyzer （SA） through repeated measurements of two standard rod lengths within a 1.5 m×1.5 m measurement volume. Measurement errors obtained with the proposed method ranged from -0.3 μm to 4.8 μm， whereas those of SA were primarily distributed between 3.0 μm and 9.5 μm.The results indicate that the proposed method achieves higher accuracy， reduced error dispersion， and improved repeatability. This enhanced performance is attributed to the rigid geometric reference constraints of the NASC model， which effectively suppress uncertainty propagation during network adjustment. The method exhibits strong general applicability and supports high-precision spatial measurements， making it suitable for optical system assembly and other engineering tasks requiring micrometer-level accuracy. It provides a practical technical reference for high-precision measurement applications.  
    关键词：pose measurement;Trilateration network adjustment;Geometric constraints;Network-Adjustment-based Self-Calibration model   
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    更新时间：2026-04-10

    YUAN Shuaibo, CHENG Ziwei, ZHANG Zihao, YIN Runtao, ZHAO Gang, ZHOU Xiaobin, YANG Jiaqi, YAN Xiaojuan, MA Weiguang

    DOI：10.37188/OPE.20263407.1047
    摘要：To enhance the sensitivity and response speed of ammonia detection using laser absorption spectroscopy， optical feedback cavity-enhanced absorption spectroscopy （OF-CEAS） was employed. The characteristic absorption line of ammonia near 6 612.7 cm⁻¹ （1 512 nm） was selected as the target transition. A V-shaped optical resonant cavity composed of three high-reflectivity mirrors was constructed， with a single-arm length of 20 cm. The ring-down time of the empty cavity was measured to be 48.12 μs， corresponding to a finesse of approximately 100 000 and an equivalent absorption path length of 14.4 km. System stability was significantly improved through precise control of temperature and gas pressure. The optical setup was housed in a temperature-controlled chamber with a stability of ±0.005 °C. In addition， a self-developed high-precision pressure control system maintained the intracavity pressure at （30 000±1.5） Pa. Under these conditions， a detection limit as low as 12 parts per trillion （ppt） was achieved at an integration time of 168 s， corresponding to a minimum detectable absorption coefficient of 1.35×10⁻¹⁰ cm⁻¹. To mitigate response delays caused by adsorption of ammonia molecules on the inner surfaces of the gas cell and pipelines， a miniaturized cavity with a volume of 7.8 mL was implemented to reduce molecular residence. Furthermore， silane passivation coatings were applied to critical pipeline sections and the inner cavity surface to suppress adsorption effects， resulting in a reduction of the average system response time to 196 s.  
    关键词：optical feedback cavity enhanced absorption spectroscopy;trace gas detection;high-precision temperature and pressure control;ammonia adsorption effect   
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    更新时间：2026-04-10

    TIAN Anyu, LIU Yan, GE Zhou, JIANG Yuchen, YU Yingjie, XIA Xinxing

    DOI：10.37188/OPE.20263407.1057
    摘要：To address the high equipment cost of conventional laser confocal microscopy and the limitations of traditional machine vision methods caused by uneven well-bottom illumination， image blurring， and difficulty in feature extraction， an automated machine vision measurement system based on coaxial illumination is proposed. The system comprises an industrial camera， a telecentric lens integrated with a coaxial light source， and a three-axis precision displacement stage. A hybrid algorithm combining autofocusing and feature recognition is employed as the core measurement strategy. Experimental results demonstrate stable and reliable system performance. For seven types of samples with aspect ratios ranging from 3.17 to 7.87， excellent measurement performance was achieved. The repeatability of aperture measurements ranges from 0.56 μm to 4.58 μm， while the repeatability of depth measurements reaches as low as 0.80 μm， with a minimum coefficient of variation of 0.09%. The deviation between the average measured values and nominal values is generally less than 1%. The proposed system enables efficient and high-precision measurement of geometric parameters of high-aspect-ratio micro-holes， providing a cost-effective solution for quality control in precision microstructure manufacturing.  
    关键词：micropore measurement;aspect ratio;autofocus;Tenengrad gradient function;OTSU   
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    更新时间：2026-04-10

    ZHANG Qiaoyang, CHEN Haiyun, ZHANG Minjie, ZHANG Kuokuo, HU Zhangxi, LI Feng, XIAO Hua

    DOI：10.37188/OPE.20263407.1068
    摘要：Indirect microalgae density measurement methods based on short-range optical detection have increasingly attracted attention in the monitoring of marine microalgae cultivation， owing to their advantages of non-contact， non-invasive operation and the absence of reagent requirements. This review systematically summarizes prevalent cell measurement strategies， encompassing benchmark methods （manual counting and dry cell weight， DCW） and indirect optical approaches （optical sensing and image analysis）. The key characteristics and applicable conditions of each method are analyzed from four perspectives： detection range， accuracy， environmental interference， and equipment dependence. In light of existing limitations， the establishment of a standardized testing platform covering representative marine microalgae species， gradient cell densities， and diverse illumination and imaging conditions is proposed， together with a multidimensional， quantifiable， and reproducible evaluation framework. This work is expected to provide systematic references and technical guidance for the selection of microalgae bioprocess monitoring systems， algorithm optimization， and the development of novel sensing paradigms.  
    关键词：optical measurement;marine microalgae;density monitoring;image analysis   
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    更新时间：2026-04-10
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