2025

• Record 61 of
  
  Title:Modeling and experimental validation of a focusing system based on fixed-clamped compliant mechanism
  
  Author Full Names:Lv, Tao(1,2); Ruan, Ping(1,2); Li, Chuang(1); Wen, Desheng(1)

  Source Title:Measurement: Journal of the International Measurement Confederation

  Language:English

  Document Type:Journal article (JA)

  Abstract:As crucial components within optical instruments, focusing systems enables precise movement of optical elements through high-resolution, high-precision mechanisms. These actions facilitate adjustments in focal length, temperature compensation, and aberration correction, all of which contribute to achieving sharp imaging or effective energy concentration. Among various focusing approaches, adjusting the position of the secondary mirror stands out due to its heightened sensitivity. This method requires superior motion precision and operates within a reduced range compared to lens group or detector-based focusing methods. This paper introduces a secondary mirror focusing system designed for sub-millimeter strokes with nanometer resolution, utilizing a fixed-clamped compliant mechanism (CM). The study employs the pseudo-rigid-body model (PRBM) methodology to model the compliant focusing mechanism. Additionally, a mechatronics-integrated model is developed, taking into account the characteristics of piezoelectric actuators. Experimental results validate the accuracy of the proposed modeling approach, as well as the precision and efficacy of the focusing system. © 2025 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, Chinese Academy of Sciences, Xi'an; 710119, China

  Publication Year:2025

  Volume:246

  Article Number:116625

  DOI Link:10.1016/j.measurement.2024.116625

  数据库ID（收录号）:20250317695007
• Record 62 of
  
  Title:Laser transmission welding of Poly(vinyl chloride) and polyamide 66 based on green femtosecond laser surface modification
  
  Author Full Names:Wang, Dongyang(1,2); Liu, Minqiu(1); Xu, Sizhi(1,2); Lu, Jianxun(3); Zhang, Ying(4); Zhai, Jianpang(5); Ruan, Shuangchen(1); Ouyang, Deqin(1); Li, Chunbo(1)

  Source Title:Optics and Laser Technology

  Language:English

  Document Type:Journal article (JA)

  Abstract:To improve the bonding strength of unweldable poly(vinyl chloride) (PVC) and polyamide 66 (PA66), a surface treatment method using green femtosecond laser (GFL) to modify PVC before welding was proposed in this study. The experiments of GFL surface modification, 1940 nm laser transmission welding (LTW), mechanical properties test and related characterization were carried out. The effects of GFL parameters on the physical and chemical properties of the modified surface and the bonding strength of the dissimilar joints were investigated in detail. The bonding mechanism of PVC/PA66 joints was analyzed comprehensively. The results showed that laser modification induced the deposition of many oxygen-containing functional groups on the PVC surface. These oxygen-containing functional groups form a highly polar modified layer on the surface, thereby improving the miscibility and welding performance of PVC/PA66. Finally, the modification and welding parameters were optimized based on the response surface methodology (RSM), and the maximum shear strength was 8.9 MPa. © 2024

  Affiliations:(1) Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, Shenzhen Technology University, Shenzhen; 518060, China; (2) College of Applied Technology, Shenzhen University, Shenzhen; 518060, China; (3) College of Urban Transportation and Logistics, Shenzhen Technology University, Shenzhen; 518060, China; (4) Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices, Xian; 710075, China; (5) College of New Materials and New Energies, Shenzhen Technology University, Shenzhen; 518060, China

  Publication Year:2025

  Volume:181

  Article Number:111737

  DOI Link:10.1016/j.optlastec.2024.111737

  数据库ID（收录号）:20243717018501
• Record 63 of
  
  Title:In Situ Infared Optical Fiber Sensor Monitoring Reactants and Products Changes during Photocatalytic Reaction
  
  Author Full Names:Wu, Zeyan(1); Zhao, Yongkun(1); You, Tianxiang(1); Kou, Zongkui(2); Xu, Yantao(3); Xia, Mengling(1); Guo, Haitao(3); Zhang, Xianghua(4); Xu, Yinsheng(1)

  Source Title:Analytical Chemistry

  Language:English

  Document Type:Journal article (JA)

  Abstract:An in situ monitoring reaction can better obtain the variations during the progression of the photocatalytic reaction. However, the complexity of the apparatus and the limited applicability of substances are the common challenges faced by most in situ monitoring methods. Here, we invented an in situ infrared optical fiber sensor to monitor the reactants and products during photocatalytic reaction. The sensor, which has four tapered regions, demonstrates the best sensitivity of 0.71 au/vol %, 70 times higher than that of the fiber sensor without a tapered region. Then, this sensor was successfully used to in situ monitor the photocatalytic reaction between benzaldehyde and ethanol under the UV light and TiO2. The calibration plots of the reactants and products were established by sensing a series of designed concentration solutions. Based on the calibration plots, the real-time concentrations of four substances could be derived by converting the absorbance values, and the concentration changes of the reactants and products followed the first order kinetic mode. The equilibrium concentrations of reactants and products could be obtained from the fitting curves. With the increase in the UV light intensity, this sensor could detect a gradual increase in the rate of this photocatalytic reaction. The results show that this in situ infrared fiber sensor can monitor the progression of the photocatalytic reaction in real time, which will be helpful for unveiling the photocatalytic mechanism. © 2025 American Chemical Society.

  Affiliations:(1) State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan; 430070, China; (2) State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan; 430070, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi’an; 710119, China; (4) Institut des Sciences Chimiques de Rennes, UMR CNRS 6226, Université de Rennes, Rennes; 35042, France

  Publication Year:2025

  Volume:97

  Issue:2

  Start Page:1229-1235

  DOI Link:10.1021/acs.analchem.4c04704

  数据库ID（收录号）:20250217674120