Optics and Laser Technology最新文献_第8页

Gravity-induced distortion dynamics of molten pool and keyhole during non-horizontal dual laser beam bilateral synchronous welding for Ti-6Al-4V alloy T-joints Ti-6Al-4V合金t形接头非水平双激光束双边同步焊接过程中熔池和锁孔重力畸变动力学

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-02-04 DOI: 10.1016/j.optlastec.2026.114815

Yanqiu Zhao , Tingyan Yan , Rui Li , Jiangfeng Wang , Chao Ma , Xiaohong Zhan

Dual laser beam bilateral synchronous welding (DLBSW) has been proven as an effective fabrication technique for Ti-6Al-4V alloy T-joints. Nevertheless, the pronounced impact of gravity deflection on fluid flow and keyhole stability in DLBSW of spatially complex curved structures must be thoroughly evaluated, given its consequential effects on porosity and fatigue life. In this paper, the thermal-fluid coupling models of Ti-6Al-4V alloy T-joints during horizontal DLBSW and Non-Horizontal DLBSW at the gravity deflection angle (θ) of 25° and 40° were respectively established. The spatiotemporal characteristics of fluid flow under diverse gravitational regimes and the dynamic evolution of the keyhole were comprehensively delineated. Additionally, the fundamental mechanism governing gravity-driven distortion of the molten pool and the resultant destabilization of the orifice under the dual-beam coupling effect was uncovered. It is revealed that gravitational deflection induces a reconfiguration of liquid metal flow from the upper molten pool, leading to diminished thermal energy delivery to the anterior wall. This, in turn, restricts the advancement of the solid/liquid interface and exacerbates thermal asymmetry. Moreover, gravitational deflection enhances bubble nucleation, impedes their removal, and compromises the liquid’s void-filling efficacy, culminating in porosity formation. These outcomes offer significant guidance for porosity suppression strategies and inform the refinement of DLBSW techniques for T-joint manufacturing.

双激光束双边同步焊接（DLBSW）是制备Ti-6Al-4V合金t型接头的有效方法。然而，考虑到重力偏转对孔隙率和疲劳寿命的影响，必须彻底评估重力偏转对空间复杂弯曲结构DLBSW中流体流动和锁孔稳定性的显著影响。建立了Ti-6Al-4V合金t型接头在重力偏转角（θ）为25°和40°时的横向和非横向DLBSW热流耦合模型。全面描绘了不同重力状态下流体流动的时空特征和锁孔的动态演化。此外，还揭示了在双光束耦合作用下，重力驱动熔池变形和导致孔板失稳的基本机理。结果表明，重力偏转引起熔池上部金属液流动的重新配置，导致前壁的热能传递减少。这反过来又限制了固/液界面的推进，加剧了热不对称。此外，重力偏转增强了气泡成核，阻碍了气泡的去除，影响了液体的充空效果，最终导致孔隙的形成。这些结果为抑制孔隙度的策略提供了重要的指导，并为t型接头制造的DLBSW技术的改进提供了信息。

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引用次数: 0

Study on picosecond laser multi-layer modification and stealth dicing of 4H-SiC wafers based on laser power modulation 基于激光功率调制的皮秒激光多层修饰及4H-SiC晶圆的隐身切割研究

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-02-04 DOI: 10.1016/j.optlastec.2026.114882

Yixiong Yan , Sijia Chen , Yuxuan Cheng , Cong Mao , Mingjun Zhang , Yu Zheng , Weidong Tang , Ji’an Duan

In the ultrafast laser stealth dicing of silicon carbide wafers, achieving both high efficiency and superior quality remains a significant challenge in wafer manufacturing. To address this, this study innovatively proposes applying laser power modulation to multi-layer modified stealth dicing of 4H-SiC, aiming to enhance cross-section quality while maintaining processing efficiency. Experiments reveal that multi-layer modification dicing utilizing self-focusing effects achieves over fourfold efficiency gains compared to single-layer modification, yet results in significantly increased cross-section roughness. Molecular dynamics simulations reveal that this phenomenon stems from edge thermal stress concentration caused by uneven heat dissipation. Building upon this insight, the proposed laser power modulation technique achieves a substantial reduction in cross-section roughness under optimized parameters, thereby synergistically enhancing both efficiency and quality. This study offers valuable insights and practical methodologies for high-quality and high-efficiency SiC wafer stealth dicing.

在碳化硅晶圆的超快激光隐形切割中，实现高效率和高质量仍然是晶圆制造的重大挑战。针对这一问题，本研究创新性地提出将激光功率调制应用于4H-SiC多层改性隐身切割中，在保持加工效率的同时提高截面质量。实验表明，利用自聚焦效应的多层修饰切割比单层修饰切割效率提高了四倍以上，但导致截面粗糙度显著增加。分子动力学模拟结果表明，这种现象是由热不均匀散热引起的边缘热应力集中引起的。在此基础上，提出的激光功率调制技术在优化参数下实现了截面粗糙度的大幅降低，从而协同提高了效率和质量。本研究为高质量、高效率的SiC晶圆隐形切割提供了有价值的见解和实用的方法。

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引用次数: 0

Thermo-mechanical coupling in electrical penetration assembly: residual strain analysis with embedded FBG strain monitoring 电侵彻装配中的热-机械耦合：残余应变分析与嵌入式FBG应变监测

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-02-04 DOI: 10.1016/j.optlastec.2026.114761

Yizheng Sun , Weiming Zeng , Hengwei Shen , Tongyu Yao , He Yan , Yushan Chen , Wen Chen , Jing Liu , Zhichun Fan

Glass-to-metal (GTM) seals are essential in Electrical Penetration Assemblies (EPAs) of nuclear power plants, where long-term hermeticity relies on residual stress generated by thermal expansion mismatch (Δα). However, conventional models cannot capture the thermo-mechanical interactions and uneven residual stress fields that often induce sealing failure, making accurate prediction and monitoring a major challenge. In this study, a thermo-mechanical analytical framework incorporating interface shear–normal stress coupling, finite element modeling, and embedded fiber Bragg grating arrays was combined to achieve real-time three-dimensional strain monitoring during manufacturing and service processes. Results demonstrate that a controlled positive Δα (8.46–12.73 × 10⁻⁶ K⁻¹) yields stable compressive stresses, whereas negative or insufficient Δα induces cracking or hermetic degradation. Furthermore, thermal cycling experiments revealed progressive residual stress relaxation and structural stabilization of the glass. These findings provide practical guidelines for improving the sealing reliability of nuclear EPAs and offer a transferable methodology for other high-temperature thermo-mechanical structures.

玻璃-金属（GTM）密封在核电厂的电气渗透组件（EPAs）中是必不可少的，其中的长期密封性依赖于热膨胀不匹配产生的残余应力（Δα）。然而，传统的模型无法捕捉到热-机械相互作用和不均匀的残余应力场，这往往会导致密封失效，这使得准确的预测和监测成为一项重大挑战。在本研究中，结合界面剪切-正应力耦合、有限元建模和嵌入式光纤布拉格光栅阵列的热-力学分析框架，实现了制造和服务过程中的实时三维应变监测。结果表明，控制的正Δα （8.46-12.73 × 10−6 K−1）产生稳定的压应力，而负或不足Δα会导致开裂或密封降解。此外，热循环实验表明，残余应力逐渐松弛和结构稳定。这些发现为提高核epa的密封可靠性提供了实用指南，并为其他高温热机械结构提供了可转移的方法。

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引用次数: 0

Delamination mechanism of CFRP adhesive layer under laser-induced shock waves 激光激波作用下CFRP胶粘剂层的分层机理

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-02-04 DOI: 10.1016/j.optlastec.2026.114876

Wangfan Zhou , Tao Wang , Jun Chen , Haoyu Zhou , Gui Zhang , Enoch Asuako Larson , Yu Yang

Adhesive repair is essential for restoring the structural integrity and mechanical performance of carbon fiber reinforced polymer (CFRP) components. After extended service, repaired structures require the removal of the adhesive patches for secondary repair. This paper investigates the interfacial damage of CFRP bonded components under laser-induced shock waves. The results show that the damage of CFRP bonding interface under laser-induced shock wave is due to the local tensile stress exceeding the tensile strength of the interface. The magnitude of local tensile stress depends on the superposition of incident wave and reflected wave at the bonding interface. Increasing pulse energy and spot diameter intensifies damage at the adhesive interface and reduces the interfacial tensile strength. As CFRP thickness increases, the interlayer tensile stress decreases, and the bonding interface damage is correspondingly reduced. Increasing curvature enlarges the angle between the reflected and incident stress wave at the bonding interface and the back surface, resulting in the reduction of the damage. Applying a metallic constraint to the rear surface of the specimen reduces the magnitude of the reflected tensile stress, thereby mitigating interfacial damage. Conversely, when the rear surface is unconstrained, the reflected tensile stress is higher, resulting in more pronounced interfacial damage.

粘接修复是修复碳纤维增强聚合物（CFRP）构件结构完整性和力学性能的必要手段。在延长服务后，修复的结构需要移除粘接贴片进行二次修复。研究了CFRP粘结构件在激光激波作用下的界面损伤。结果表明：激光激波作用下CFRP粘结界面的损伤是由于局部拉应力超过界面的抗拉强度造成的；局部拉应力的大小取决于入射波和反射波在键合界面的叠加。脉冲能量和光斑直径的增加加剧了粘接界面的损伤，降低了界面的抗拉强度。随着CFRP厚度的增加，层间拉应力减小，粘结界面损伤相应减小。曲率的增加增大了键合界面与背表面反射和入射应力波之间的夹角，从而减小了损伤。在试样的后表面施加金属约束可以减小反射拉应力的大小，从而减轻界面损伤。相反，当后表面不受约束时，反射的拉应力更高，导致界面损伤更明显。

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引用次数: 0

Apodized hollow conical occulter with gradient transmittance for stray-light suppression 用于杂散光抑制的渐变透过率空心锥形消光器

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-02-04 DOI: 10.1016/j.optlastec.2026.114855

Hongzu Zhang , Li Wang , Bo Li , Hanshuang Li , Guochao Gu , Xu Zhang

This study addresses faint target detection under intense backgrounds by proposing a novel hollow truncated conical external occulter for stray light suppression in imaging systems. Unlike material-dependent transmittance control methods, the design innovatively optimizes transmittance distribution via geometric parameter tuning, significantly reducing edge diffraction and attenuating image-plane stray light. Leveraging TRACEPRO’s optimization capabilities and gradient transmittance diffraction theory, a precise optical model is established, with the occulter’s diffraction and stray light characteristics quantitatively analyzed through numerical optimization workflows. During optimization, the occulter structure and lens configuration are co-optimized to enhance imaging quality while boosting weak-signal detection capability. Combined with an internal occulter and Lyot stop in a multi-stage suppression scheme, the design reduces image-plane background irradiance to the 10⁻⁸ order, maintaining effective imaging at a minimum angular separation of 0.5°. This approach discards the traditional method of achieving transmittance variation through multiple materials, but rather leverages flexible geometric structures to control a single material, enabling precise optimization of graded transmittance. It not only exhibits excellent diffraction light suppression performance but also opens up a novel technical pathway for the manufacturing of external occulters. Additionally, it effectively mitigates strong background interference such as solar radiation, significantly enhancing space target detection accuracy and providing reliable support for weak signal acquisition in space target monitoring and exploration missions.

本研究提出了一种新型的中空截锥形外掩光器，用于成像系统中的杂散光抑制，解决了强背景下的微弱目标检测问题。与依赖于材料的透光率控制方法不同，该设计通过几何参数调整创新地优化了透光率分布，显著减少了边缘衍射和衰减像平面杂散光。利用TRACEPRO的优化能力和梯度透射衍射理论，建立了精确的光学模型，并通过数值优化工作流程定量分析了掩膜的衍射和杂散光特性。在优化过程中，对掩光结构和透镜配置进行了协同优化，以提高成像质量，同时增强弱信号检测能力。结合内部遮光器和多级抑制方案中的Lyot停止，该设计将图像平面背景辐照度降低到10 - 8阶，在最小角分离0.5°的情况下保持有效成像。这种方法抛弃了通过多种材料实现透光率变化的传统方法，而是利用灵活的几何结构来控制单一材料，从而实现梯度透光率的精确优化。它不仅具有优异的衍射抑制性能，而且为外掩星的制造开辟了一条新的技术途径。有效缓解太阳辐射等强背景干扰，显著提高空间目标探测精度，为空间目标监测探测任务中的微弱信号采集提供可靠支持。

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引用次数: 0

Low-Hydroxyl tellurite fiber for Mid-Infrared Er:YAG laser transmission 中红外Er:YAG激光传输用低羟基碲酸盐光纤

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-02-01 DOI: 10.1016/j.optlastec.2026.114829

Shuru Chen , Zhijian Wei , Jin Li , Biqing Wang , Yuze Wang , Kai Jiao , Shengchuang Bai , Pingxue Li , Vladimir Shiryaev , Xunsi Wang

Due to pronounced hydroxyl (–OH) absorption bands around 2.7 μm in the mid-infrared region, tellurite glasses typically exhibit limited performance for mid-infrared laser transmission, which in turn constrains their suitability for Er:YAG laser delivery. This limitation arises primarily from –OH impurities, which introduce strong absorption in the mid-infrared band and significantly degrade transmission efficiency. To enhance the mid-infrared transmission performance and laser-induced damage threshold of TeO₂–ZnO–La₂O₃ (TZL) glass, high-temperature vacuum melting was employed as a physical purification method to effectively remove –OH impurities from the glass matrix. The effects of melting temperature and vacuum level on purification efficiency were systematically investigated. Through optimization of raw-material refining and melting parameters, low-hydroxyl tellurite glass was successfully obtained, exhibiting an –OH absorption coefficient as low as 0.004 cm^–1—representing a 99.8% reduction compared with conventional unpurified samples. The purified glass was subsequently extruded into core–cladding preforms and drawn into flexible fibers with a core diameter of 300 μm and a cladding diameter of 600 μm. The fabricated TZL fiber achieved a maximum stable output power of 8.3 W at 2.94 μm, corresponding to an energy density of 1061 J cm^–2. To the best of our knowledge, this is the first demonstration of a tellurite fiber capable of stably delivering more than 8 W of Er:YAG laser power at 2.94 μm, highlighting its strong potential for high-power mid-infrared laser applications in surgical medicine and industrial processing.

由于碲酸盐玻璃在中红外区2.7 μm附近有明显的羟基（-OH）吸收带，因此中红外激光传输性能有限，这反过来又限制了其对Er:YAG激光传输的适用性。这种限制主要来自于-OH杂质，它在中红外波段引入强吸收，显著降低了传输效率。为了提高TeO2-ZnO-La2O3 （TZL）玻璃的中红外透射性能和激光损伤阈值，采用高温真空熔炼作为物理净化方法，有效去除玻璃基体中的-OH杂质。系统地研究了熔炼温度和真空度对提纯效率的影响。通过优化原料精制和熔融参数，成功制得低羟基碲酸盐玻璃，其-OH吸收系数低至0.004 cm - 1，比常规未纯化样品降低99.8%。然后将纯化后的玻璃挤压成芯包覆预制品，拉伸成芯直径为300 μm、包层直径为600 μm的柔性纤维。所制备的TZL光纤在2.94 μm处的最大稳定输出功率为8.3 W，对应的能量密度为1061 J cm-2。据我们所知，这是碲酸盐光纤的首次演示，能够在2.94 μm下稳定地提供超过8 W的Er:YAG激光功率，突出了其在外科医学和工业加工中的高功率中红外激光器应用的强大潜力。

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引用次数: 0

A robust topologically guided optical fiber with ultra-low confinement loss 一种鲁棒的超低约束损耗拓扑引导光纤

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-02-01 DOI: 10.1016/j.optlastec.2026.114831

Somashreeta Roy , Abhijit Biswas , Bishnu P. Pal , Somnath Ghosh

We propose an innovative topological optical fiber inspired by the Su–Schrieffer–Heeger model, which enables robust light confinement in the core at the telecom wavelength of 1.55

μ

m. Its design features a 1D dielectric periodic quarter-wave stack with inversion symmetry, which supports a topological interface state identified via Zak phase analysis based on the Wilson-loop method and transmission spectra. Further, validation of our model is achieved by mapping it with the winding behaviors of the SSH tight-binding model that rely on Maxwell’s solutions. The designed fiber yields a small and tunable mode area of 0.61

{μ m}^{2}

, dispersion of 5 ps/nm.km, and low confinement loss of 0.26 dB/km, with potential to reduce it further to an attractively lower value (as low as 0.01 dB/km) via geometric optimization. A pulse propagation study is reported by using the Split-Step-Fourier-Method to solve the normalized nonlinear Schrodinger Equation. A hyperbolic secant input pulse with 170 mW peak power, 0.5 ps width, exhibits only 1% loss in power over a 40 km length with minimal broadening. The fiber geometry also enables light guidance in air, expanding its potential applications for the transmission of qubits for quantum communications due to significantly lower latency.

本文提出了一种基于Su-Schrieffer-Heeger模型的新型拓扑光纤，该光纤在1.55μ m的通信波长处实现了核心的鲁棒光约束，其设计特点是具有反演对称性的一维介电周期四分之一波堆叠，支持基于Wilson-loop方法和透射光谱的Zak相位分析识别的拓扑界面状态。此外，通过将我们的模型与依赖于麦克斯韦解的SSH紧密绑定模型的缠绕行为进行映射来验证我们的模型。该光纤的模面积小，可调，为0.61 μm2，色散为5 ps/nm。约束损耗低至0.26 dB/km，并有可能通过几何优化进一步降低到更低的值（低至0.01 dB/km）。用分步傅里叶法求解归一化非线性薛定谔方程，研究了脉冲的传播。一个峰值功率为170 mW，宽度为0.5 ps的双曲正割输入脉冲，在40公里的长度上只有1%的功率损失，宽度最小。光纤几何结构还可以实现空气中的光导，由于延迟显着降低，扩展了其在量子通信中传输量子比特的潜在应用。

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引用次数: 0

Miniature fiber-optic photoacoustic spectrometer with interferometrically enhanced tuning fork detection 干涉增强音叉检测的微型光纤光声光谱仪

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-02-01 DOI: 10.1016/j.optlastec.2026.114841

Xiaoli Liu , Liang Wu , Zhiyong Hao , Hongpeng Wu , Lei Dong

A miniaturized fiber-optic photoacoustic spectrometer based on interferometrically enhanced tuning fork detection is reported. In contrast to traditional quartz-enhanced photoacoustic spectroscopy, this system leverages a fiber-optic Mach-Zehnder interferometer (MZI), stabilized at the quadrature point, to detect the vibration of the quartz tuning fork, thereby facilitating all-optical photoacoustic signal detection. Performance assessments with water vapor as the target gas indicate that the system achieves a detection sensitivity comparable to traditional quartz-enhanced photoacoustic spectroscopy, with a normalized noise equivalent absorption (NNEA) coefficient of 7.44 × 10⁻⁷ cm⁻¹⋅W/Hz¹^/². Additionally, this all-optical, miniaturized fiber-optic photoacoustic spectrometer exhibits robust resistance to electromagnetic interference in simulated high-interference environments.

报道了一种基于干涉增强音叉检测的小型化光纤光声光谱仪。与传统的石英增强光声光谱相比，该系统利用稳定在正交点的光纤马赫-曾德尔干涉仪（MZI）来检测石英音叉的振动，从而促进了全光光声信号的检测。以水蒸气为目标气体的性能评估表明，该系统的探测灵敏度可与传统的石英增强光声光谱相媲美，归一化噪声等效吸收（NNEA）系数为7.44 × 10−7 cm−1⋅W/Hz1/2。此外，这种全光学、小型化的光纤光声光谱仪在模拟的高干扰环境中表现出强大的抗电磁干扰能力。

引用次数: 0

Graded-index anti-reflection coatings with high-power laser-induced damage resistance and high transmittance based on a SiOxNy layer deposited by PECVD 基于PECVD沉积SiOxNy层的高透光率和高功率激光损伤的分级折射率增透涂层

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-02-01 DOI: 10.1016/j.optlastec.2026.114859

Liangyi Hang , Yue You , Yuxin Yang , Shigeng Song , Yaqing Zhang , Jian Song , Jin Cheng , Yechuan Zhu , Haifeng Liang , Junqi Xu , Shun Zhou , Weiguo Liu

To address the issue that conventional anti-reflection coatings (ARCs) are vulnerable in high-power laser systems, this paper presents a design method for a graded-index ARC with laser-induced damage resistance and high transmittance, based on the SiO_xN_y layer prepared by PECVD techniques. Three graded-index ARCs are designed and prepared; the minimum average transmittance is 99.01 % of the graded-index ARCs is 0.21 % lower than that of the conventional ARCs. The laser damage resistance is predicted by calculating the electric field intensity distribution of all ARCs. The ARCs consisted of amorphous and nonstoichiometric SiO_xN_y films formed on glass substrates by PECVD techniques. Through determining the crystallite state, relative atomic concentration, Si-centred tetrahedral phase Si-Si_4-(_ν₊_η₎O_νN_η, refractive indices, and extinction coefficients of each layer, the microscopic mechanism of the effects of chemical bond properties on the refractive index is discussed in detail. The designed and measured transmittances of all graded-index ARCs were compared; the average transmittance maximum deviation of the single-sided ARCs over the visible spectrum is 0.1 %, which shows good agreement. The measured laser-induced damage threshold value of the 3rd graded-index ARCs is 7.15 J/cm², and the relative change improves to 161.90 %, compared to the conventional ARCs of 2.73 J/cm². The damage spot morphologies of high-power laser irradiation test demonstrate that the spot diameter was reduced by close to 85.33 % to conventional ARCs. These results are discussed in detail and are expected to serve as a reference for the preparation of high-power laser protection optical films formed via PECVD.

针对传统增透涂层在高功率激光系统中易受伤害的问题，提出了一种基于PECVD技术制备的SiOxNy增透层的抗激光损伤、高透光率梯度折射率增透涂层的设计方法。设计并制备了三种分级索引电弧；渐变折射率电弧的最小平均透过率为99.01%，比常规电弧低0.21%。通过计算各电弧的电场强度分布，预测了激光损伤抗力。电弧由PECVD技术在玻璃衬底上形成的非晶和非化学计量SiOxNy薄膜组成。通过测定晶体状态、相对原子浓度、硅心四面体相Si-Si4-(ν+η)OνNη、折射率和消光系数，详细讨论了化学键性质对折射率影响的微观机理。比较了各渐变折射率电弧的设计透射率和实测透射率；单面电弧在可见光谱上的平均透过率最大偏差为0.1%，两者具有较好的一致性。激光损伤阈值为7.15 J/cm2，与传统电弧的2.73 J/cm2相比，激光损伤阈值的相对变化提高到161.90%。高功率激光辐照损伤光斑形貌测试表明，光斑直径比常规电弧减小了近85.33%。本文对这些结果进行了详细的讨论，以期为PECVD制备高功率激光防护光学薄膜提供参考。

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引用次数: 0

Adaptive fusion imaging for delamination defects in GFRP composites based on terahertz time-domain spectroscopy 基于太赫兹时域光谱的玻璃钢复合材料分层缺陷自适应融合成像

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2026-02-01 DOI: 10.1016/j.optlastec.2026.114863

Rui Li , Zenghua Liu , Yuheng Wu , Huabing Zhu , Yiyi Liu , Meiling Wang , Cunfu He

Glass fiber reinforced polymer (GFRP) composites are widely used in the aerospace field, but delamination defects are prone to occur during manufacturing and service. To address the challenges of low identification accuracy and difficulty in integrating depth information for delamination defects, this paper proposes an adaptive fusion imaging and quantitative characterization method based on reflective terahertz time-domain spectroscopy (THz-TDS). After filtering and denoising the time-domain signals, multiple imaging features are extracted using a sliding time window. An adaptive fusion algorithm based on the Sobel gradient is used to optimize the weight distribution of defects at different depths, achieving effective integration of multi-layer defect information. Local contrast is enhanced through background removal via polynomial fitting and morphological top-hat transformation. Gradient-weighted shrinkage algorithms and combined thresholding strategies are employed for defect segmentation and quantification. Experimental results demonstrated that variance features combined with adaptive fusion imaging could reveal multi-layer defects, with an average error of less than 7% for defects of different sizes. This method effectively suppressed background interference and significantly improved the identification sensitivity and localization accuracy of weak delamination defects within multilayer composites. Consequently, this paper provides a reliable non-destructive testing approach for the quality assessment and safety assurance of composite components.

玻璃纤维增强聚合物（GFRP）复合材料广泛应用于航空航天领域，但在制造和使用过程中容易出现分层缺陷。针对分层缺陷识别精度低、深度信息难以整合的问题，提出了一种基于反射太赫兹时域光谱（THz-TDS）的自适应融合成像与定量表征方法。对时域信号进行滤波和去噪后，利用滑动时间窗提取多个成像特征。采用基于Sobel梯度的自适应融合算法优化缺陷在不同深度处的权重分布，实现多层缺陷信息的有效融合。通过多项式拟合和形态顶帽变换去除背景增强局部对比度。采用梯度加权收缩算法和组合阈值策略对缺陷进行分割和量化。实验结果表明，方差特征与自适应融合成像相结合，可以对多层缺陷进行识别，对不同尺寸缺陷的平均误差小于7%。该方法有效地抑制了背景干扰，显著提高了多层复合材料内部弱分层缺陷的识别灵敏度和定位精度。从而为复合材料构件的质量评价和安全保障提供了一种可靠的无损检测方法。

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引用次数: 0