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Sensors, Volume 25, Issue 23

2025 December-1 - 302 articles

Cover Story: Wireless sensors are vital for condition monitoring but rely on unsustainable batteries. While vibration energy harvesting offers a promising alternative, current harvesters often neglect high-frequency energy, which is weak but contains abundant information and is further attenuated by destructive interference from multiple sources. To address these limitations, this paper proposes a symmetrical gradient metamaterial beam (SGMB) integrated with multiple piezoelectric patches to enhance multi-band high-frequency energy harvesting and suppress dual-source destructive interference. Simulation and experimental results demonstrate that the SGMB provides multiple enhanced bands within 1000 Hz–3500 Hz and improves the energy harvesting efficiency by over 100 times, representing a breakthrough for self-powered and self-sensing wireless sensors. View this paper
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Articles (302)

  • Article
  • Open Access
711 Views
17 Pages

4 December 2025

The integration of movable antenna (MA) and reconfigurable intelligent surfaces (RIS) offers promising potential for enhancing simultaneous wireless information and power transfer (SWIPT) systems. In this paper, we investigate a novel MA-enabled RIS-...

  • Article
  • Open Access
1 Citations
512 Views
21 Pages

4 December 2025

Radio Frequency Identification (RFID) is a core enabler of the Industrial Internet of Things (IIoT), yet dense deployments suffer from tag collisions and reader interference that degrade reliability and inflate infrastructure cost. This study propose...

  • Article
  • Open Access
750 Views
23 Pages

Localization of Radio Signal Sources for Situational Awareness Enhancement

  • Krzysztof Malon,
  • Paweł Skokowski and
  • Gregor Pavlin

4 December 2025

This article proposes a novel passive localization framework that leverages detection results from existing distributed radio detectors. The intuition behind this solution is to combine positive (signal detected) and negative (signal not detected) de...

  • Article
  • Open Access
893 Views
29 Pages

A Novel Data-Driven Multi-Agent Reinforcement Learning Approach for Voltage Control Under Weak Grid Support

  • Jiaxin Wu,
  • Ziqi Wang,
  • Ji Han,
  • Qionglin Li,
  • Ran Sun,
  • Chenhao Li,
  • Yuehan Cheng,
  • Bokai Zhou,
  • Jiaming Guo and
  • Bocheng Long

4 December 2025

To address active voltage control in photovoltaic (PV)-integrated distribution networks characterized by weak voltage support conditions, this paper proposes a multi-agent deep reinforcement learning (MADRL)-based coordinated control method for PV cl...

  • Article
  • Open Access
517 Views
21 Pages

4 December 2025

Deep neural networks (DNNs) have achieved remarkable progress across various domains, yet they remain highly vulnerable to adversarial attacks, which significantly hinder their deployment in safety-critical applications. While stochastic defenses hav...

  • Article
  • Open Access
1 Citations
505 Views
18 Pages

4 December 2025

Excessive swing of the cantilevered conveyor trough is a key issue restricting the working efficiency and operational stability of combine harvesters. To suppress its swing, this study established a dynamic model of the conveyor trough to reveal the...

  • Article
  • Open Access
592 Views
24 Pages

Conformal Swallowing Accelerometry: Reimagining the Acquisition and Characterization of Swallowing Mechano-Acoustic Signals

  • Wilson Yiu Shun Lam,
  • Elaine Kwong,
  • Randolph Chi Kin Leung,
  • Chak Hang Lee,
  • Sanjaya Rai and
  • Leo Kwan Lui

4 December 2025

(1) Background: Non-invasive instrumental measurement of swallowing acoustic signals has rested upon the assumptions of signal symmetry and reproducibility along the cervical region and has hence taken the form of single-point acquisition on optimal...

  • Article
  • Open Access
526 Views
24 Pages

4 December 2025

Campus stairwells, characterized by their crowded nature during certain short periods of time, present a high risk for falls that can lead to dangerous stampedes. Accurate fall detection is crucial for preventing such accidents. However, existing res...

  • Article
  • Open Access
712 Views
19 Pages

Towards In-Vehicle Non-Contact Estimation of EDA-Based Arousal with LiDAR

  • Jonas Brandstetter,
  • Eva-Maria Knoch and
  • Frank Gauterin

4 December 2025

Driver monitoring systems are increasingly relying on physiological signals to assess cognitive and emotional states for improved safety and user experience. Electrodermal activity (EDA) is a particularly informative biomarker of arousal but is conve...

  • Article
  • Open Access
513 Views
18 Pages

Tolerance Analysis of Test Mass Alignment Errors for Space-Based Gravitational Wave Detection

  • Jun Ke,
  • Ruihong Gao,
  • Jinghan Liu,
  • Mengyang Zhao,
  • Ziren Luo,
  • Jia Shen and
  • Peng Dong

4 December 2025

Space-based gravitational wave detection imposes extremely high requirements on displacement measurement accuracy, with its core measurement components being laser interferometers and inertial sensors. The laser interferometers detect gravitational w...

  • Article
  • Open Access
844 Views
26 Pages

Lightweight and Compact Pulse Radar for UAV Platforms for Mid-Air Collision Avoidance

  • Dawid Sysak,
  • Arkadiusz Byndas,
  • Tomasz Karas and
  • Grzegorz Jaromi

4 December 2025

Small and medium Unmanned Aerial Vehicles (UAVs) are commonly equipped with diverse sensors for situational awareness, including cameras, Frequency-Modulated Continuous-Wave (FMCW) radars, Light Detection and Ranging (LiDAR) systems, and ultrasonic s...

  • Article
  • Open Access
589 Views
28 Pages

4 December 2025

Predicting the fatigue lifespan of Twisted String Actuators (TSAs) is essential for improving the reliability of robotic and mechanical systems that rely on flexible transmission mechanisms. Traditional empirical approaches based on regression or Wei...

  • Article
  • Open Access
782 Views
14 Pages

Accelerometer-Based Gait Analysis as a Predictive Tool for Mild Cognitive Impairment in Older Adults

  • Junwei Shen,
  • Yoshiko Nagata,
  • Toshiya Shimamoto,
  • Shigehito Matsubara,
  • Masato Nakamura,
  • Fumiya Sato,
  • Takuya Motoshima,
  • Katsuhisa Uchino,
  • Akira Mori and
  • Shinichiro Nakamura
  • + 3 authors

4 December 2025

This study explores the potential of accelerometer-based gait analysis as a non-invasive approach for predicting cognitive impairment in older adults. A total of 75 participants (61.3% female; mean age: 78.9 years), including cognitively normal indiv...

  • Article
  • Open Access
485 Views
25 Pages

4 December 2025

The article describes a system for monitoring the vital parameters of evacuated individuals, integrating three key functionalities: pulse detection, verification of wristband contact with the skin, and motion recognition. For pulse detection, the sys...

  • Article
  • Open Access
582 Views
24 Pages

4 December 2025

Ultra-high sampling rates in coherent optical front-ends increasingly exceed the processing capabilities of real-time baseband processors, creating a bottleneck in coherent free-space optical communication systems. We propose a unified state-space fr...

  • Article
  • Open Access
462 Views
14 Pages

4 December 2025

Neuroimaging assumes spatial and temporal uniformity, yet brain activity exhibits a multifractal cascade structure with intermittent bursts and long-range dependencies. We use controlled simulations to test how well standard sampling strategies (rand...

  • Article
  • Open Access
1 Citations
507 Views
14 Pages

Simulation and Experiment of Tilted Fiber Bragg Grating Humidity Sensor Coated with PVA/GO Nanofiber Films by Electrospinning

  • Li Deng,
  • Hao Sun,
  • Jiawei Xi,
  • Yanxin Yang,
  • Xin Liu,
  • Chaochao Jian,
  • Xiang Li and
  • Jinze Li

4 December 2025

Relative humidity (RH) and temperature are crucial parameters in environmental monitoring and have attracted significant attention. However, traditional commercial sensors typically suffer from inherent limitations such as structural complexity, bulk...

  • Article
  • Open Access
446 Views
21 Pages

4 December 2025

Radar waveform design is an important approach to radar system performance enhancement. For a long time, synthetic aperture radar (SAR) systems have utilized linear frequency modulation (LFM) waveforms as transmitted signals and have relied on window...

  • Article
  • Open Access
667 Views
26 Pages

Sensor-Based Cyber Risk Management in Railway Infrastructure Under the NIS2 Directive

  • Rafał Wachnik,
  • Katarzyna Chruzik and
  • Bolesław Pochopień

4 December 2025

This study introduces a sensor-centric cybersecurity framework for railway infrastructure that extends Failure Mode and Effects Analysis (FMEA) from traditional reliability evaluation into the domain of cyber-induced failures affecting data integrity...

  • Article
  • Open Access
894 Views
20 Pages

4 December 2025

In recent years, video-based monitoring systems have been widely adopted across multiple domains and have become particularly vital in geohazard monitoring and early warning. These systems overcome the inherent limitations of conventional monitoring...

  • Article
  • Open Access
601 Views
12 Pages

Intraocular Cytokine Level Prediction from Fundus Images and Optical Coherence Tomography

  • Hidenori Takahashi,
  • Taiki Tsuge,
  • Yusuke Kondo,
  • Yasuo Yanagi,
  • Satoru Inoda,
  • Shohei Morikawa,
  • Yuki Senoo,
  • Toshikatsu Kaburaki,
  • Tetsuro Oshika and
  • Toshihiko Yamasaki

4 December 2025

The relationship between retinal images and intraocular cytokine profiles remains largely unexplored, and no prior work has systematically compared fundus- and OCT-based deep learning models for cytokine prediction. We aimed to predict intraocular cy...

  • Feature Paper
  • Article
  • Open Access
820 Views
28 Pages

MA-EVIO: A Motion-Aware Approach to Event-Based Visual–Inertial Odometry

  • Mohsen Shahraki,
  • Ahmed Elamin and
  • Ahmed El-Rabbany

4 December 2025

Indoor localization remains a challenging task due to the unavailability of reliable global navigation satellite system (GNSS) signals in most indoor environments. One way to overcome this challenge is through visual–inertial odometry (VIO), wh...

  • Article
  • Open Access
472 Views
24 Pages

4 December 2025

The permanent magnet synchronous motor (PMSM) is extensively utilized in the power drive systems of Cyber–Physical Systems (CPSs). In scenarios where control signals are subjected to malicious attacks within the network, ensuring that the PMSM...

  • Article
  • Open Access
1 Citations
713 Views
22 Pages

EFDepth: A Monocular Depth Estimation Model for Multi-Scale Feature Optimization

  • Fengchun Liu,
  • Xinying Shao,
  • Chunying Zhang,
  • Liya Wang,
  • Lu Liu and
  • Jing Ren

4 December 2025

To address the accuracy issues in monocular depth estimation caused by insufficient feature extraction and inadequate context modeling, a multi-scale feature optimization model named EFDepth was proposed to improve prediction performance. This framew...

  • Article
  • Open Access
594 Views
20 Pages

4 December 2025

In this paper, we propose a novel speech emotion recognition model, named MAGTF-Net (Multi-scale Attention Graph Transformer Fusion Network), which addresses the challenges faced by traditional hand-crafted feature-based approaches in modeling comple...

  • Article
  • Open Access
1 Citations
887 Views
17 Pages

From Static to Dynamic: Complementary Roles of FSR and Piezoelectric Sensors in Wearable Gait and Pressure Monitoring

  • Sara Sêco,
  • Vítor Miguel Santos,
  • Sara Valvez,
  • Beatriz Branquinho Gomes,
  • Maria Augusta Neto and
  • Ana Martins Amaro

4 December 2025

Objective: Plantar pressure abnormalities have a significant impact on mobility and quality of life. Real-time pressure monitoring is essential in clinical and rehabilitation settings for assessing patient progress and refining treatment protocols. I...

  • Article
  • Open Access
642 Views
13 Pages

Association Between Stride Parameters and Racetrack Curvature for Thoroughbred Chuckwagon Horses

  • Matthijs van den Broek,
  • Zoe Y. S. Chan,
  • Charlotte De Bruyne,
  • Karelhia Garcia-Alamo,
  • Sara Skotarek Loch and
  • Thilo Pfau

4 December 2025

Increased risk of musculoskeletal injury in galloping racehorses has been linked to decreased stride length and reduced speed over consecutive races prior to the injury. As racetrack curvature influences horses’ maximal speed, we hypothesized i...

  • Article
  • Open Access
559 Views
23 Pages

4 December 2025

Accurately measuring the verticality of a single pile is of crucial importance for ensuring the safe operation of offshore wind power projects. However, mainstream methods have disadvantages such as high dependence on manual labor, low real-time perf...

  • Article
  • Open Access
585 Views
17 Pages

4 December 2025

Recently, the convergence of advanced sensor technologies and innovations in artificial intelligence and robotics has highlighted facial emotion recognition (FER) as an essential component of human–computer interaction (HCI). Traditional FER st...

  • Article
  • Open Access
738 Views
13 Pages

A 326,000 fps 640 × 480 Resolution Continuous-Mode Ultra-High-Speed Global Shutter CMOS BSI Imager

  • Jean-Luc Bacq,
  • Mandar Thite,
  • Roeland Vandebriel,
  • Swaraj Bandhu Mahato,
  • Philippe Coppejans,
  • Jonathan Borremans,
  • Linkun Wu,
  • Kuba Rączkowski,
  • Ismail Cevik and
  • Annachiara Spagnolo
  • + 7 authors

4 December 2025

This paper describes an ultra-high-speed monolithic global shutter CMOS image sensor capable of continuous motion capture at 326,000 fps with a resolution of 640 × 480 pixels. The performance is enabled by a novel combination of pixel technolog...

  • Article
  • Open Access
457 Views
19 Pages

4 December 2025

The global low-carbon transition is driving the use of renewable energy for ecological monitoring. Traditional power supply for forest monitoring sensor equipment is constrained by high wired costs, frequent battery replacement, and the limitations o...

  • Article
  • Open Access
2 Citations
878 Views
23 Pages

4 December 2025

This manuscript presents a study on the application of blind source separation (BSS) techniques, specifically the Independent Component Analysis (ICA) method, for the detection and identification of localized faults in rolling element bearings. Beari...

  • Systematic Review
  • Open Access
1 Citations
699 Views
24 Pages

Advanced Clustering for Mobile Network Optimization: A Systematic Literature Review

  • Claude Mukatshung Nawej,
  • Pius Adewale Owolawi and
  • Tom Mmbasu Walingo

4 December 2025

5G technology represents a transformative shift in mobile communications, delivering improved ultra-low latency, data throughput, and the capacity to support huge device connectivity, surpassing the capabilities of LTE systems. As global telecommunic...

  • Article
  • Open Access
799 Views
28 Pages

3 December 2025

Advanced sensors in connected automated vehicles (CAVs) increasingly collect facial biometric information for environmental perception, posing serious privacy leakage risks. However, existing privacy protection methods for automotive data primarily f...

  • Article
  • Open Access
1 Citations
689 Views
15 Pages

Coherent-Phase Optical Time Domain Reflectometry for Monitoring High-Temperature Superconducting Magnet Systems

  • Matthew Leoschke,
  • William Lo,
  • Victor Yartsev,
  • Steven Derek Rountree,
  • Steve Cole and
  • Federico Scurti

3 December 2025

High-temperature superconductor (HTS) magnet systems, especially those designed for fusion reactors, require effective and reliable monitoring to avoid damaging anomalies. In tokamaks, some of the magnetic coils are time-dependent, which causes strai...

  • Article
  • Open Access
663 Views
15 Pages

Draw Tower Optical Fibers with Functional Coatings and Their Possible Use in Distributed Sensor Technology

  • Sandy Alomari,
  • Kenny Hey Tow,
  • Joao Pereira,
  • Miguel Soriano-Amat,
  • Tedros Weldehawariat,
  • Korina Hartmann,
  • Remco Nieuwland and
  • Åsa Claesson

3 December 2025

Functional coatings on optical fibers enable selective detection of environmental and chemical parameters, but their use is typically limited to point or quasi-distributed sensing due to localized deposition techniques. In this work, we demonstrate a...

  • Article
  • Open Access
628 Views
20 Pages

Improving Geodetic Monitoring in the Aeolian Archipelago: Performance Assessment of the Salin@net GNSS Network

  • Federico Pietrolungo,
  • Alessandra Esposito,
  • Giuseppe Pezzo,
  • Aladino Govoni,
  • Letizia Anderlini,
  • Mirko Iannarelli,
  • Andrea Terribili,
  • Claudio Chiarabba and
  • Mimmo Palano

3 December 2025

The Aeolian Archipelago, located in the southern margin of the Tyrrhenian Sea, is a key area to investigate the interplay between regional active fault systems and volcanic activity, making it a focal point for geodynamic studies. In particular, Sali...

  • Article
  • Open Access
527 Views
17 Pages

3 December 2025

Structures with slender cylindrical geometries, such as subsea power cables are critical components of infrastructure systems. These structures are prone to bending deformation under load, which can ultimately cause structural failure. In this study,...

  • Article
  • Open Access
714 Views
25 Pages

3 December 2025

Falls among the elderly represent a leading cause of injury and mortality worldwide, necessitating reliable and real-time monitoring solutions. This study aims to develop a lightweight, accurate, and efficient fall detection framework based on an imp...

  • Article
  • Open Access
1 Citations
479 Views
19 Pages

3 December 2025

This study analyses how the orientation of the measurement head in a magnetic diagnostic system affects the parameters of magnetic signals recorded during steel-cord conveyor belt inspection. The experiments were conducted on a laboratory test stand...

  • Article
  • Open Access
685 Views
19 Pages

Molecularly Imprinted Membranes: Dual@MIPs@mbr for On-Site Detection of CA 19-9

  • Eduarda Rodrigues,
  • Ana Xu,
  • Paula Sampaio,
  • Rafael C. Castro,
  • David S. M. Ribeiro,
  • João L. M. Santos and
  • Ana Margarida L. Piloto

3 December 2025

Dual-emission molecularly imprinted membranes (dual@MIPs@mbr) were developed as a proof-of-concept platform for the selective and instrument-free detection of the cancer biomarker carbohydrate antigen 19-9 (CA 19-9). The system integrates a ratiometr...

  • Article
  • Open Access
632 Views
33 Pages

3 December 2025

Cognitive radio networks (CRNs) rely heavily on spectral sensing to detect primary user (PU) activity, yet detection at low signal-to-noise ratios (SNRs) remains a major challenge. Hence, a novel “Deep Wavelet Cyclostationary Independent Gaussi...

  • Review
  • Open Access
2 Citations
1,900 Views
33 Pages

3 December 2025

Pedestrian trajectory prediction is a critical component of autonomous driving and intelligent urban systems, with deep learning now dominating the field by overcoming the limitations of traditional models in handling multi-modal behaviors and comple...

  • Article
  • Open Access
551 Views
34 Pages

3 December 2025

The die bonding process significantly impacts the yield and quality of IC packaging, and its quality detection is also a critical image sensing technology. With the advancement of machine automation and increased operating speeds, the misclassificati...

  • Article
  • Open Access
685 Views
25 Pages

3 December 2025

Tracking small, fast-moving unmanned aerial vehicles (UAVs) in thermal infrared (TIR) imagery is a significant challenge due to low-resolution targets, Dynamic Background Clutter, and frequent occlusions. To address this, we introduce MemLoTrack, a n...

  • Article
  • Open Access
683 Views
25 Pages

3 December 2025

The paper presents two innovative measurement methods for assessing the flexural performance of precast concrete beams that are prestressed with Carbon Fiber-Reinforced Polymer (CFRP) bars. Strains, displacements, crack development, and failure modes...

  • Article
  • Open Access
1,063 Views
22 Pages

3 December 2025

This paper presents the mechanical design and simulation-based validation of a novel compact and low-cost 3-DOF dual-arm robotic system tailored for space-constrained applications such as rescue robotics. The proposed design achieves a fully folded f...

  • Article
  • Open Access
1 Citations
828 Views
25 Pages

Pipeline Leakage Identification Based on Acoustic Sensors and EPSO-1D-CNN-Bi-LSTM Model

  • Niannian Wang,
  • Kuankuan Zhang,
  • Xingyi Wang,
  • Bigang Peng and
  • Shuwei Zhai

3 December 2025

Water supply pipe systems are typically buried in the ground, leakage has always been a significant problem for urban water supply systems. Although leakage detection can be performed using in-pipe inspection devices with hydrophone modules, the accu...

  • Article
  • Open Access
671 Views
16 Pages

3 December 2025

This paper presents an analysis of the impact of the control architecture in a mobile robot on the quality of regulation in real systems. Comparative studies were conducted for successive stages of the implementation of architectural improvements, su...

  • Article
  • Open Access
1,011 Views
25 Pages

A Privacy-Preserving Approach to Health Insurance Fraud Detection Using Vertical Federated Learning

  • Raghi K R,
  • Arjun Paramarthalingam,
  • Harini Kanthan and
  • Mahalakshmi Karthiban

3 December 2025

In fraud detection, centralized approaches often face challenges related to data protection, security, and potential data breaches. Such methods require sensitive healthcare and insurance data to be pooled in one location, which increases vulnerabili...

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Sensors - ISSN 1424-8220