Sensors and Actuators A-physical最新文献

1,10-phenanthroline-modified silver-coated D-shaped optical fiber SPR sensor for selective and rapid detection of Fe²⁺ ions in corrosion environments 1,10-菲罗啉修饰的镀银d型光纤SPR传感器，用于腐蚀环境中选择性、快速检测Fe 2 +离子

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical

Pub Date : 2026-01-15 DOI: 10.1016/j.sna.2026.117491

Yaning Wang , Dong Luo , Zhongxiao Song , Xiaodong Zhu , Zhixin Guo , Ziming Xu

In this study, a surface plasmon resonance(SPR) sensor based on a phenanthroline self-assembled layer–modified silver-coated D-shaped plastic optical fiber (POF) was developed for the selective and real-time detection of Fe²⁺ ions in corrosive environments. The sensor structure was modeled and analyzed using COMSOL Multiphysics, with finite element simulations of the optical field to optimize the parameters of the fiber core, cladding, and metal film layers. The effective refractive index and near-field distribution of the plasmonic modes were systematically investigated.Simulation results indicated that when the silver film thickness was 40 nm and the phenanthroline molecular layer thickness was approximately 7 nm, the localized electric field confinement at the metal–dielectric interface was significantly enhanced, thereby improving resonance stability and sensitivity.Experimental results showed that the sensor exhibited a strong linear response toward Fe²⁺ within the concentration range of 120 pg·mL⁻¹ –1.2 μg·mL⁻¹ , with a resonance wavelength sensitivity of 3.832 nm·log(pg·mL⁻¹)⁻¹ and a corresponding refractive index sensitivity of 6669 nm·RIU⁻¹ . The limit of detection (LOD) reached 1.6 pg·mL⁻¹ , and the response time was approximately 10 s.The sensor showed excellent selectivity toward Fe²⁺ ions, with a pronounced spectral response compared to other commonly coexisting metal ions, such as Cu²⁺, Zn²⁺, Ni²⁺, Hg²⁺, Ca²⁺, and Mg²⁺.By combining multilayer structural synergy with chelation-based interfacial recognition, the proposed phenanthroline-modified D-shaped fiber SPR sensor exhibits high sensitivity, rapid response, and outstanding selectivity, highlighting its applicability for early-stage corrosion monitoring of underground and subsea metallic pipelines.

在本研究中，基于菲罗啉自组装层修饰镀银d型塑料光纤（POF）开发了一种表面等离子体共振（SPR）传感器，用于在腐蚀环境中选择性和实时检测Fe 2 +离子。利用COMSOL Multiphysics对传感器结构进行了建模和分析，并对光场进行了有限元模拟，优化了光纤芯、包层和金属膜层的参数。系统地研究了等离子体模的有效折射率和近场分布。仿真结果表明，当银膜厚度为40 nm，邻菲罗啉分子层厚度约为7 nm时，金属-介电界面的局域电场约束明显增强，从而提高了谐振稳定性和灵敏度。实验结果表明，该传感器对Fe 2⁺在120 pg·mL⁻¹ -1.2 μg·mL⁻¹ 的浓度范围内表现出较好的线性响应，共振波长灵敏度为3.832 nm·log（pg·mL⁻¹）⁻¹ ，对应的折射率灵敏度为6669 nm·RIU⁻¹ 。检测限（LOD）为1.6 pg·mL⁻¹ ，反应时间约为10 s。该传感器对Fe 2 +离子表现出优异的选择性，与其他常见的共存金属离子（如Cu 2 +、Zn 2 +、Ni 2 +、Hg 2 +、Ca 2 +和Mg 2 +）相比，具有明显的光谱响应。通过将多层结构协同作用与螯合界面识别相结合，提出的邻菲罗啉修饰的d型光纤SPR传感器具有高灵敏度、快速响应和出色的选择性，突出了其在地下和海底金属管道早期腐蚀监测中的适用性。

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引用次数: 0

Artificial intelligence-enabled MOS gas sensors: Towards Selective and intelligent detection in complex environments 支持人工智能的MOS气体传感器：在复杂环境中实现选择性和智能检测

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical

Pub Date : 2026-01-15 DOI: 10.1016/j.sna.2026.117502

Gen Li , Sunghoon Park , Hyojung Kim , Muhammad Hilal , Zhicheng Cai

Metal oxide semiconductor (MOS) gas sensors are widely studied for their low cost, simple fabrication, and high sensitivity to a broad range of analytes. Despite decades of progress, their broader deployment remains constrained by poor selectivity, environmental variability, signal drift, and poor inter device reproducibility. Artificial intelligence (AI) has recently emerged as a promising strategy to overcome these limitations by extracting meaningful information from complex sensor responses and enabling predictive and adaptive behavior. This review highlights the convergence of MOS gas sensing with AI. We first revisit the fundamental operating principles of MOS sensors and explain why conventional approaches often underperform in real world settings. We then summarize key AI methods, including classical machine learning, deep learning, and more recent technologies, while analyzing their respective strengths and limitations for gas sensing tasks. Particular emphasis is placed on integration strategies such as single sensor enhancement, sensor array fusion, drift correction, AI guided materials and device design, and lightweight on device deployment. We further examine application domains where AI-enhanced MOS sensors demonstrate clear advantages, including environmental monitoring, healthcare diagnostics, food safety, industrial safety, and Internet of Things (IoT) systems. Finally, we discuss ongoing challenges related to data scarcity, model generalization, interpretability, and scalability, and we outline future directions for developing intelligent, reliable, and large-scale MOS sensing ecosystems.

金属氧化物半导体（MOS）气体传感器因其成本低、制造简单、对各种分析物的高灵敏度而受到广泛的研究。尽管几十年来取得了进展，但它们的广泛部署仍然受到选择性差、环境可变性、信号漂移和设备间可重复性差的限制。通过从复杂的传感器响应中提取有意义的信息，并实现预测和自适应行为，人工智能（AI）最近成为克服这些限制的一种有前途的策略。本文综述了MOS气体传感与人工智能的融合。我们首先回顾了MOS传感器的基本工作原理，并解释了为什么传统方法在现实世界中往往表现不佳。然后，我们总结了关键的人工智能方法，包括经典机器学习、深度学习和最新技术，同时分析了它们各自在气体传感任务中的优势和局限性。特别强调的是集成策略，如单传感器增强、传感器阵列融合、漂移校正、人工智能引导材料和设备设计，以及设备部署的轻量化。我们进一步研究了人工智能增强的MOS传感器显示出明显优势的应用领域，包括环境监测、医疗诊断、食品安全、工业安全和物联网（IoT）系统。最后，我们讨论了与数据稀缺性、模型泛化、可解释性和可扩展性相关的持续挑战，并概述了开发智能、可靠和大规模MOS传感生态系统的未来方向。

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引用次数: 0

Multi-field tuning of photocurrents in single phase multiferroic BLFCT thin films 单相多铁BLFCT薄膜中光电流的多场调谐

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical

Pub Date : 2026-01-15 DOI: 10.1016/j.sna.2026.117507

Ji Luo, Peng Zhou, Yuxiong Cao, Tianjin Zhang, Jinzhao Wang, Yajun Qi

Multiferroic materials, exhibiting both ferroelectric and ferromagnetic order, have garnered significant interest for optoelectronic applications. Ferroelectricity provides spontaneous polarization and photoresponse capabilities, while ferromagnetism introduces magneto-optical coupling effects, giving these materials distinct advantages in multifunctional device design. This study investigates the manipulation of photocurrent via multiple fields (electric and magnetic) in single phase multiferroic Bi₄LaFe_0.7Co_0.3Ti₃O₁₅ (BLFCT) thin films towards self-powered ultraviolet photodetector. High-quality multiferroic BLFCT thin films were fabricated on Nb:SrTiO₃ (NSTO) substrates using pulsed laser deposition, forming Pt/BLFCT/NSTO heterojunctions. Under 365 nm ultraviolet illumination, the device exhibited significant self-powered characteristics, achieving a zero-bias photocurrent density of 39.354 μA/cm² and an on/off ratio exceeding 450. Moreover, the photocurrent could be further enhanced by up to 20 % through the application of a magnetic field, demonstrating the multi-field tunability of the device. Further investigations revealed that the switchable ferroelectric polarization modulates the strength of the effective internal electric field, which dominates the separation and transportation of the photocarriers. Moreover, the magnetostrictive effect and the magnetoelectric coupling-induced ferroelectric polarization promote the separation and transport of photogenerated carriers, thereby enhancing the overall photoresponse performance. This work establishes a promising strategy for employing multiferroic materials in low-power-consumption UV detection applications.

多铁性材料，同时表现出铁电和铁磁有序，已经引起了光电应用的极大兴趣。铁电性提供自发极化和光响应能力，而铁磁性引入磁光耦合效应，使这些材料在多功能器件设计中具有明显的优势。本研究研究了在单相多铁Bi4LaFe0.7Co0.3Ti3O15 （BLFCT）薄膜中，通过多个场（电场和磁场）对自供电紫外光电探测器的光电流操纵。采用脉冲激光沉积技术在Nb:SrTiO3 （NSTO）衬底上制备了高质量的多铁BLFCT薄膜，形成了Pt/BLFCT/NSTO异质结。在365 nm紫外光照射下，器件表现出明显的自供电特性，零偏置光电流密度达到39.354 μA/cm²，通断比超过450。此外，通过施加磁场，光电流可以进一步增强高达20% %，证明了该器件的多场可调性。进一步的研究表明，铁电极化可调节有效内电场的强度，控制着光载流子的分离和输运。此外，磁致伸缩效应和磁电耦合诱导的铁电极化促进了光生载流子的分离和输运，从而提高了整体光响应性能。这项工作为在低功耗紫外检测应用中使用多铁性材料建立了一个有前途的策略。

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引用次数: 0

Bio-inspired piezoelectric scales for active turbulent drag reduction 用于主动湍流减阻的仿生压电鳞片

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical

Pub Date : 2026-01-14 DOI: 10.1016/j.sna.2026.117499

Lu Zhang , Xiaoxue Zhao , Guoliang Zhang , Mengfei Lv , Haoyang Fan , Haoming Liu , Zhijie Xie , Kai Li

Existing bionic scale drag reduction technologies primarily mimic the morphology and arrangement patterns of fish scales to achieve drag reduction, but fail to replicate the active micro-vibrations of scales. This study develops a bio-inspired scale system based on piezoelectric actuation, where the piezoelectric actuator serves as the active vibration component to drive the scales and generate coupled perturbations within the boundary layer. This study advances biomimicry from static geometry to dynamic function. The design biomimics the morphological architecture of fish scales while replicating their microscale kinematic flow control mechanisms, achieving viscous drag mitigation through dynamic boundary layer modulation. Through simulation analysis, the drag reduction mechanism of the drag reducer was revealed, and proposed drag reduction performance control method. Drag reduction experiments were conducted to validate the effectiveness of the reducer, which demonstrate that the proposed bionic piezoelectric scale reducer effectively reduces wall frictional drag. The drag reduction rate of the drag reducer can reach 24.13 % at an incentive amplitude of 100 V and an operating frequency of 1648 Hz. This work can provide insights for advancing bionic scale drag reduction technologies.

现有的仿生鱼鳞减阻技术主要是模仿鱼鳞的形态和排列模式来实现减阻，但未能复制鱼鳞的主动微振动。本研究开发了一种基于压电驱动的仿生尺度系统，其中压电驱动器作为主动振动元件驱动尺度并在边界层内产生耦合微扰。本研究将仿生从静态几何向动态功能推进。该设计仿生学了鱼鳞的形态结构，同时复制了鱼鳞的微尺度运动流动控制机制，通过动态边界层调制实现了粘性阻力缓解。通过仿真分析，揭示了减速器的减阻机理，并提出了减阻性能控制方法。通过减阻实验验证了该减阻器的有效性，结果表明所设计的仿生压电式减阻器能够有效地减小壁面摩擦阻力。当激励幅值为100 V，工作频率为1648 Hz时，减速器的减阻率可达24.13 %。这项工作可以为推进仿生规模减阻技术提供见解。

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引用次数: 0

Characterization of the superposition of mixed signals of polymetallic particles 多金属粒子混合信号叠加的表征

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical

Pub Date : 2026-01-13 DOI: 10.1016/j.sna.2026.117474

Chenyong Wang, Zhongyang Cai, Chenzhao Bai, Shukui Hu, Xiangming Kan, Xurui Zhang, Riwei Wang, Hongpeng Zhang

When the abrasive particles gather in the oil and pass through the sensor, the mixed abrasive particles will cause false alarms and missed alarms of the monitoring equipment. To enhance the precision of detecting abrasive particles, an analysis was conducted on the impact of various mixtures of iron and copper particles on the detection signal. The results show that the magnetization coupling between ferromagnetic particles and eddy current coupling between non-ferromagnetic particles significantly affect the detection signal. The closer the particle aggregation shape is to the spherical shape, the more significant the eddy current effect is and the weaker the magnetic induction strength is. The study proposes a multi-metal particle differentiation and identification method based on the amplitude of the inductive-resistive signal, which can accurately differentiate 75 % of the particle combinations, and the remaining 25 % can be differentiated by the change rule of the signal curve, providing theoretical and experimental support for improving the accuracy of multi-metal particle detection in oil fluids.

当磨料颗粒聚集在油中并通过传感器时，混合的磨料颗粒会引起监控设备的误报和漏报。为了提高磨料颗粒检测的精度，分析了不同铁、铜颗粒混合物对检测信号的影响。结果表明，铁磁粒子之间的磁化耦合和非铁磁粒子之间的涡流耦合对检测信号有显著影响。颗粒聚集形状越接近球形，涡流效应越显著，磁感应强度越弱。研究提出了一种基于感阻信号幅值的多金属颗粒鉴别与识别方法，可准确鉴别75% %的颗粒组合，剩余的25% %可根据信号曲线变化规律进行鉴别，为提高油液中多金属颗粒的检测精度提供了理论和实验支持。

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引用次数: 0

Enhanced magnetic field sensing using geometric-mediated whispering gallery mode resonators 增强磁场感应使用几何介导低语画廊模式谐振器

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical

Pub Date : 2026-01-12 DOI: 10.1016/j.sna.2026.117458

Amir R. Ali , Yasmin Yousry , Alaa El Anssary

The development of highly sensitive magnetic field sensors is critical for applications in biomedical diagnostics, wearable technologies, and environmental monitoring. While conventional research focuses on material composition, the influence of geometric configuration remains largely unexplored. This study demonstrates the profound impact of macroscopic shape on the sensitivity of magnetorheological (MR) nanocomposite sensors. Initial macroscopic experiments with pyramid-like structures revealed unexpected localized magnetic field perturbations, challenging the assumption that only material properties dictate field interactions. Inspired by these findings, we fabricated a novel optical fiber magnetic field sensor using magnetic nanoparticles dispersed within a polydimethylsiloxane (PDMS) matrix. The sensor's performance was evaluated by subjecting it to a controlled harmonic magnetic field using a neodymium magnet. Our comparative analysis revealed that a conventional spherical sensor had a limited sensitivity of 0.0065 pm/mT and a resolution of ∼ 2mT. In contrast, an innovatively designed pyramidal sensor exhibited a remarkable sensitivity of 35.098 pm/µT, achieving a resolution of ∼ 0.2 µT. This represents a groundbreaking enhancement of over 5 million times in sensitivity and an improvement of nearly four orders of magnitude in resolution. We attribute this unprecedented amplification to the geometrical concentration of magnetic flux within the pyramidal shape, a finding that highlights the critical role of macroscopic geometry in dictating the performance of advanced sensing platforms and presents a promising pathway for the development of next-generation, ultrasensitive magnetic field detectors in different industrial and bio medical applications.

高灵敏度磁场传感器的开发对于生物医学诊断、可穿戴技术和环境监测的应用至关重要。虽然传统的研究主要集中在材料成分上，但几何结构的影响在很大程度上仍未被探索。本研究证明了宏观形状对磁流变（MR）纳米复合传感器灵敏度的深远影响。金字塔状结构的初始宏观实验揭示了意想不到的局部磁场扰动，挑战了只有材料性质决定场相互作用的假设。受这些发现的启发，我们利用分散在聚二甲基硅氧烷（PDMS）基质中的磁性纳米颗粒制造了一种新型光纤磁场传感器。通过将传感器置于钕磁铁控制的谐波磁场中，对传感器的性能进行了评估。我们的比较分析表明，传统的球形传感器的有限灵敏度为0.0065 pm/mT，分辨率为~ 2mT。相比之下，创新设计的金字塔传感器具有35.098 pm/µT的显着灵敏度，实现了~ 0.2µT的分辨率。这代表了灵敏度超过500万倍的突破性提高，分辨率提高了近四个数量级。我们将这种前所未有的放大归因于金字塔形状内磁通量的几何集中，这一发现突出了宏观几何在决定先进传感平台性能方面的关键作用，并为不同工业和生物医学应用中开发下一代超灵敏磁场探测器提供了一条有希望的途径。

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引用次数: 0

Smart nanoprobes in diabetes management: Emerging role of carbon quantum dots in diagnosis and therapy 智能纳米探针在糖尿病管理：碳量子点在诊断和治疗中的新兴作用

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical

Pub Date : 2026-01-12 DOI: 10.1016/j.sna.2026.117490

Basila A.K. , Desu Gayathri Niharika , CS Krishna Murthy , K.Sandeep Raju , Punam Salaria , Amarendar Reddy M.

Insulin, a peptide hormone crucial for glucose homeostasis, is produced by the beta cells of the pancreatic islets of Langerhans. An imbalance in glucose metabolism can lead to diabetes mellitus, a chronic metabolic disorder. This imbalance can result from insufficient production or the body’s inability to effectively use the insulin it produces because of structural abnormalities or cellular resistance. The prevalence of diabetes is steadily increasing worldwide. Early and accurate detection of diabetes is crucial for effective treatment, prevention, and symptom management. In this discussion, we highlight the significance of Carbon Quantum Dots (CQDs), carbon-based nanoparticles (typically < 10 nm), in diabetes detection and their potential role in therapeutic applications for diabetes-related complications. We also explore various synthesis methods of CQDs, their characterization techniques, and different CQD-based sensors, along with their underlying detection mechanisms.

胰岛素是一种对葡萄糖稳态至关重要的肽激素，由朗格汉斯胰岛的β细胞产生。葡萄糖代谢失衡可导致糖尿病，这是一种慢性代谢紊乱。这种不平衡可能是由于结构异常或细胞抵抗导致胰岛素分泌不足或身体无法有效利用其产生的胰岛素。糖尿病的患病率在世界范围内稳步上升。糖尿病的早期和准确检测对于有效的治疗、预防和症状管理至关重要。在本讨论中，我们强调了碳量子点（CQDs），碳基纳米颗粒（通常为10 nm）在糖尿病检测中的重要性及其在糖尿病相关并发症治疗应用中的潜在作用。我们还探讨了cqd的各种合成方法、表征技术和不同的cqd传感器，以及它们的潜在检测机制。

引用次数: 0

Piezoelectric sonic black hole for broadband energy harvesting 用于宽带能量收集的压电声波黑洞

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical

Pub Date : 2026-01-12 DOI: 10.1016/j.sna.2026.117487

Lihua Peng , Qibo Mao , Ziyan Chen , Xiaohang Hu , Ping Cai

In this study, an acoustic energy harvester (AEH) composed of a Sonic black hole (SBH) and a circular piezoelectric composite sheet (PCS) is proposed. As sound waves propagate through the SBH structure, their amplitude increases and the waves become concentrated at the SBH termination. In the proposed AEH, the SBH is used to amplify the incident sound pressure and enable the energy of the incident sound wave to be fully converted into electrical energy through the PCS. The proposed AEH was evaluated using theoretical calculations, numerical simulation and experimental tests. The results indicate that the SBH exhibits a significant sound pressure amplification effect. Final, the AEH was fabricated by 3D printing. Experimental results show that the half-absorption bandwidth of AEH is 523 Hz within the frequency range of 50–1000 Hz. The maximum output power of AEH is 8 μW and the maximum power conversion efficiency of the AEH is almost 100 % under the optimal load resistance (5000 Ω). The proposed AEH features an efficient, easy-to-integrate structure, making it versatile for use in acoustic energy harvesters and absorbers.

本文提出了一种由声波黑洞（SBH）和圆形压电复合片（PCS）组成的声能收集器（AEH）。当声波通过SBH结构传播时，其振幅增加，波在SBH末端集中。在本文提出的AEH中，SBH用于放大入射声压，并使入射声波的能量通过PCS充分转化为电能。通过理论计算、数值模拟和实验测试对所提出的AEH进行了评价。结果表明，SBH具有显著的声压放大效应。最后，采用3D打印技术制作AEH。实验结果表明，在50 ~ 1000 Hz的频率范围内，AEH的半吸收带宽为523 Hz。在最佳负载电阻（5000 Ω）下，AEH的最大输出功率为8 μW，最大功率转换效率接近100 %。所提出的AEH具有高效，易于集成的结构，使其在声能收集器和吸收器中用途广泛。

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引用次数: 0

Thermally tuned long-range surface plasmon resonance sensor for in situ detection of oil mixture in edible oils 用于食用油中油脂混合物原位检测的热调谐远程表面等离子体共振传感器

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical

Pub Date : 2026-01-11 DOI: 10.1016/j.sna.2026.117485

Mohd Hafiz Abu Bakar , Wan Mohd Ebtisyam Mustaqim Mohd Daniyal , Muhammad Qayyum Othman , Athiyah Sakinah Masran , Nur Hidayah Azeman , Muhammad Asif Ahmad Khushaini , Retna Apsari , Mohd Adzir Mahdi , Mohammed Thamer Alresheedi , Fairuz Abdullah , Ahmad Ashrif A. Bakar

Long-Range Surface Plasmon Resonance (LRSPR) has emerged as a promising sensing technique for detecting compositional changes in oil mixtures. In this study, LRSPR was applied to monitor the mixing of edible oil with mineral oil under different thermal conditions (30 °C and 50 °C). The resonance response at 30 °C exhibited a non-linear calibration profile with an overall sensitivity of 5.60 nm/% (R² = 0.997). Region I (0–10 %) showed a sensitivity of 1.39 nm/% (R² = 0.9545, LOD = 0.45 %), while Region II (10–50 %) demonstrated strong linearity with 6.63 nm/% (R² = 0.993). At 50 °C, the overall sensitivity decreased to 3.47 nm/% (R² = 0.991), with Region I (0–30 %) suppressed to 0.64 nm/% (R² = 0.792, LOD = 0.61 %), and Region II (30–50 %) regaining a steeper slope of 7.89 nm/% (R² = 0.991). Elevated temperature was found to broaden resonance features, reduce peak intensity, and increase damping, consistent with the Drude model. Despite these effects, the sensor maintained reliable detection performance across both temperature conditions. These findings highlight LRSPR as a sensitive and versatile platform for in situ screening of edible oil mixtures, offering robust detection even under variable thermal environments.

远程表面等离子体共振（LRSPR）是一种很有前途的检测石油混合物成分变化的传感技术。本研究采用LRSPR对不同热条件（30℃和50℃）下食用油与矿物油的混合进行监测。30°C时的共振响应呈现非线性校准曲线，总体灵敏度为5.60 nm/% （R²= 0.997）。区域1（0 ~ 10 %）的灵敏度为1.39 nm/% (R²= 0.9545,LOD = 0.45 %)，区域2（10 ~ 50 %）的线性关系为6.63 nm/% （R²= 0.993）。在50°C时，总灵敏度下降到3.47 nm/% (R²= 0.991)，其中区域I（0-30 %）被抑制到0.64 nm/% (R²= 0.792,LOD = 0.61 %)，区域II（30-50 %）恢复到7.89 nm/% （R²= 0.991）。发现温度升高会拓宽共振特征，降低峰值强度，增加阻尼，与德鲁德模型一致。尽管存在这些影响，传感器在两种温度条件下都保持可靠的检测性能。这些发现突出了LRSPR作为一个敏感和通用的平台，用于食用油混合物的原位筛选，即使在可变的热环境下也能提供强大的检测。

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引用次数: 0

Optimisation of adhesive-free high-frequency miniature class IV transducers incorporating single-element piezoelectric plates 包含单元件压电板的无粘合剂高频微型IV类换能器的优化

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical

Pub Date : 2026-01-11 DOI: 10.1016/j.sna.2026.117489

Xuan Li , Yifei Wang , Youheng Zeng , Dongliang Shi , Zhihong Huang , Kwok-Ho Lam

Tissue biopsy under regional anaesthesia requires accurate localisation of the needle tip during penetration through skin and soft tissue. To enhance needle tip visibility in colour Doppler imaging, ultrasonically actuated needle systems based on bolted Langevin transducers have been developed. However, these systems impose design constraints as the needle length must be tuned to the transducer resonance, and their relatively large size limits the suitability for hand-held procedures. Flextensional transducers offer a compact alternative, enabling large displacement with minimal bulk piezoelectric material. This paper presents an optimisation study of three metal shell geometries for class IV miniature flextensional transducers, excited by hard piezoelectric plates to maximise displacement amplification. The transducers employ a negative interference fit between the piezoelectric plate and metal shell, introducing structural pre-stress without bonding or transition mechanisms. Additionally, the dynamic response and power density of the transducers are evaluated for different active materials, including piezoceramics (Pz54) and piezocrystals (Mn:PIN-PMN-PT). Experimental results show that, for identical dimensions, the Mn:PIN-PMN-PT transducer achieves a lower resonant frequency, reduced and near-resistive impedance, enhanced electromechanical coupling, higher mechanical Q, and increased power density compared with the piezoceramic counterpart.

区域麻醉下的组织活检需要针头在穿透皮肤和软组织时准确定位。为了提高彩色多普勒成像中针尖的可见性，基于螺栓朗格万换能器的超声驱动针系统已经被开发出来。然而，这些系统施加了设计限制，因为针头长度必须调整到换能器共振，并且它们相对较大的尺寸限制了手持式程序的适用性。弯张换能器提供了一种紧凑的替代方案，可以用最小的体积压电材料实现大位移。本文提出了一个优化研究的三种金属外壳几何形状的IV类微型弯张换能器，由硬压电板激发，以最大限度地扩大位移。换能器在压电板和金属外壳之间采用负干涉配合，在没有粘合或过渡机制的情况下引入结构预应力。此外，对不同活性材料（包括压电陶瓷（Pz54）和压电晶体（Mn:PIN-PMN-PT））下换能器的动态响应和功率密度进行了评估。实验结果表明，在相同尺寸下，Mn:PIN-PMN-PT换能器比压电陶瓷换能器具有更低的谐振频率、更低的近阻阻抗、更强的机电耦合、更高的机械Q和更高的功率密度。

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引用次数: 0