IEEE Sensors Letters最新文献_第2页

Natural Cellulose-Based Flexible Bioimpedance Electrodes for AgriFood Applications 农业食品应用的天然纤维素基柔性生物阻抗电极

IF 2.2

IEEE Sensors Letters Pub Date : 2025-04-16 DOI: 10.1109/LSENS.2025.3561689

Ahmed Rasheed;Sundus Riaz;Pietro Ibba;Giulia Elli;Angelo Zanella;Luisa Petti;Paolo Lugli

{"title":"Natural Cellulose-Based Flexible Bioimpedance Electrodes for AgriFood Applications","authors":"Ahmed Rasheed;Sundus Riaz;Pietro Ibba;Giulia Elli;Angelo Zanella;Luisa Petti;Paolo Lugli","doi":"10.1109/LSENS.2025.3561689","DOIUrl":"https://doi.org/10.1109/LSENS.2025.3561689","url":null,"abstract":"This letter presents a monolayer onion epidermis as an ultrathin substrate for the development of dry electrodes used in electrical impedance spectroscopy (EIS), offering biocompatibility, flexibility, and high fidelity. The dry electrode is fabricated by sputtering a 100 nm layer of molybdenum onto the hydrophilic side of the epidermis membrane. Optical characterization confirms the structural integrity and quality of the thin metal film. Electrical characterization reveals a low sheet resistance of 151.28 <inline-formula><tex-math>$pm$</tex-math></inline-formula> 0.08 <inline-formula><tex-math>$Omega$</tex-math></inline-formula>/m<inline-formula><tex-math>$^{2}$</tex-math></inline-formula>, and experimental EIS studies demonstrate the electrode's enhanced electrical characteristics and capability to acquire impedance spectra from various fruits. In addition, durability tests over six months show comparable performance to commercial electrodes. This biocompatible electrode offrs a promising, cost-effective, and sustainable solution with reduced resource utilization, ideal for agrifood and wearable electronics applications.","PeriodicalId":13014,"journal":{"name":"IEEE Sensors Letters","volume":"9 5","pages":"1-4"},"PeriodicalIF":2.2,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An RF Amplifier Integrated With a Monitoring Sensor and a Terminal Power Sensor 一种集成监控传感器和终端功率传感器的射频放大器

IF 2.2

IEEE Sensors Letters Pub Date : 2025-04-16 DOI: 10.1109/LSENS.2025.3560545

Jiarui Hao;Xiaoping Liao;Zaifa Zhou

引用次数: 0

Relaxation Oscillator Based Improved Resistance to Frequency Converter

IF 2.2

IEEE Sensors Letters Pub Date : 2025-04-15 DOI: 10.1109/LSENS.2025.3561019

Ekta Sharma;Mohammad Idris Wani;Shahid Malik

{"title":"Relaxation Oscillator Based Improved Resistance to Frequency Converter","authors":"Ekta Sharma;Mohammad Idris Wani;Shahid Malik","doi":"10.1109/LSENS.2025.3561019","DOIUrl":"https://doi.org/10.1109/LSENS.2025.3561019","url":null,"abstract":"The relaxation oscillator-based circuits find utility in various resistive and capacitive sensor interfaces, thanks to their quasi-digital output. The integration of relaxation oscillator with Wheatstone bridge brings the unique advantage of a high-resolution resistive sensing system without any additional analog-to-digital converters. However, the conventional topologies of a Wheatstone bridge circuit with relaxation oscillator encounter challenges, such as dc offset voltage and output nonlinearity, particularly for single-element resistive sensors. This letter introduces an improved relaxation oscillator-based configuration to mitigate these issues. It employs a dc-servo loop between the Wheatstone bridge and the relaxation oscillator for offset voltage compensation. In addition, the quarter bridge circuit is modified to linearly convert the resistance change into output frequency change across a broad dynamic range of “<inline-formula><tex-math>$Delta R$</tex-math></inline-formula> .” The design and experimental results are discussed. The results show that quarter and full bridge configurations are immune to offset voltage variations as high as 100 and 60 mV, respectively, and provide linear frequency response for the “<inline-formula><tex-math>$Delta R/text{R'}$</tex-math></inline-formula>’ variations up to 190% and 90% in quarter and full bridge configuration, respectively, with nonlinearity error of less than 0.01%.","PeriodicalId":13014,"journal":{"name":"IEEE Sensors Letters","volume":"9 5","pages":"1-4"},"PeriodicalIF":2.2,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Wafer-Level Vacuum-Packaged MEMS Quadruple Mass Gyroscope Operated in Mode-Split and Open-Loop Detection 晶圆级真空封装MEMS四重质量陀螺仪的模式分裂和开环检测

IF 2.2

IEEE Sensors Letters Pub Date : 2025-04-15 DOI: 10.1109/LSENS.2025.3560456

Shaolei Ge;Bo Jiang;Shenhu Huang;Yan Su

{"title":"A Wafer-Level Vacuum-Packaged MEMS Quadruple Mass Gyroscope Operated in Mode-Split and Open-Loop Detection","authors":"Shaolei Ge;Bo Jiang;Shenhu Huang;Yan Su","doi":"10.1109/LSENS.2025.3560456","DOIUrl":"https://doi.org/10.1109/LSENS.2025.3560456","url":null,"abstract":"This letter proposes a wafer-level vacuum-packaged micro - electro - mechanical systems (MEMS) quadruple mass gyroscope (QMG) based on the classical QMG architecture. The design incorporates several innovations to enhance performance in open-loop and mode-split operation modes. The proposed QMG employs variable-area comb electrodes to improve driving electrostatic nonlinearities and sensing nonlinearities. Quadrature errors are reduced through electrostatic negative stiffness using quadrature electrodes on proof masses. Wafer-level vacuum packaging achieves a high drive mode Q-factor of 1.06 million, enabling a low ac driving voltage of 4.7 mV, thereby effectively suppressing the feedthrough interference. The use of numerous sensing combs and a frequency and damping regulator reduces the sense mode Q-factor to 0.11 million, enhancing environmental interference resistance. In addition, the numerous sensing combs further enhance the open-loop scale factor. Leveraging these innovative designs, the QMG achieves a bias instability of 0.54°/h at a frequency split of 70 Hz, an angle random walkof 0.55°/√h, a dynamic range of ±300°/s, and a theoretical bandwidth of 37.8 Hz. These characteristics demonstrate that the proposed QMG achieves satisfactory performance in frequency-split and open-loop modes.","PeriodicalId":13014,"journal":{"name":"IEEE Sensors Letters","volume":"9 5","pages":"1-4"},"PeriodicalIF":2.2,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Novel Hybrid TDMA–DDMA Approach for Imaging Automotive Radar Systems 一种新型TDMA-DDMA混合成像汽车雷达系统方法

IF 2.2

IEEE Sensors Letters Pub Date : 2025-04-15 DOI: 10.1109/LSENS.2025.3560791

Deniz Kumlu;Timothee Vincon;Muhammad Arsalan;Ernesto Horne

{"title":"A Novel Hybrid TDMA–DDMA Approach for Imaging Automotive Radar Systems","authors":"Deniz Kumlu;Timothee Vincon;Muhammad Arsalan;Ernesto Horne","doi":"10.1109/LSENS.2025.3560791","DOIUrl":"https://doi.org/10.1109/LSENS.2025.3560791","url":null,"abstract":"In this letter, we propose a novel hybrid time-division multiple access (TDMA) and Doppler-division multiple access (DDMA) model for cascaded radar systems, targeting high-resolution automotive radar applications. By leveraging the Texas instruments AWR2243 radar sensor, configured in a cascaded multiple-input multiple-output arrangement, we demonstrate the advantages of combining TDMA and DDMA for enhanced performance in both velocity resolution and range accuracy. Conventional TDMA and DDMA approaches suffer from inherent tradeoffs between maximum unambiguous velocity, Doppler resolution, and frame rate. Our hybrid method dynamically toggle between TDMA and DDMA activation patterns, achieving a balance between these metrics. Through theoretical analysis and experimental validation, we show that our model improves Doppler resolution while maintaining a competitive frame rate and range resolution. The proposed hybrid solution is particularly advantageous for scenarios where both high velocity measurements and high angular resolution are critical, such as in advanced driver-assistance systems and autonomous driving. This approach provides a flexible and efficient means of optimizing radar performance without compromising key system parameters, as supported by our experimental results and theoretical calculations.","PeriodicalId":13014,"journal":{"name":"IEEE Sensors Letters","volume":"9 5","pages":"1-4"},"PeriodicalIF":2.2,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Human Activity Classification With User-Held FMCW Radar Using Deep Recurrent Neural Networks 利用深度递归神经网络对用户持有的FMCW雷达进行人类活动分类

IF 2.2

IEEE Sensors Letters Pub Date : 2025-04-15 DOI: 10.1109/LSENS.2025.3560919

Juho Cha;Insoo Choi;Kyungwoo Yoo;Youngwook Kim

引用次数: 0

An Attention Guided Lightweight Network-Based Scheme for Anxiety Detection Using Multimodal Analysis of Single-Channel Wearable ECG and RSP Sensor Signals 基于单通道可穿戴ECG和RSP传感器信号多模态分析的注意力引导轻量级网络焦虑检测方案

IF 2.2

IEEE Sensors Letters Pub Date : 2025-04-14 DOI: 10.1109/LSENS.2025.3560396

Utsab Saha;Swojan Datta Sammya;Puja Saha;Shaikh Anowarul Fattah;Celia Shahnaz

引用次数: 0

m-MTDATA:WSe2:Alq3 Nanocomposite-Based Broadband Photodetector m-MTDATA:WSe2:Alq3纳米复合材料宽带光电探测器

IF 2.2

IEEE Sensors Letters Pub Date : 2025-04-14 DOI: 10.1109/LSENS.2025.3560538

Tulika Bajpai;Shweta Tripathi

{"title":"m-MTDATA:WSe2:Alq3 Nanocomposite-Based Broadband Photodetector","authors":"Tulika Bajpai;Shweta Tripathi","doi":"10.1109/LSENS.2025.3560538","DOIUrl":"https://doi.org/10.1109/LSENS.2025.3560538","url":null,"abstract":"The authors demonstrate a high response broad band photodetector using poly(3,4-ethylenedioxythiophene):polystyrene sulfonate as hole transport layer, 4,4′,4″-tris(3-methylphenylphenylamino) triphenylamine (m-MTDATA), tris(8-hydroxyquinoline) aluminum (III) (Alq3), and Tungsten di-selenide (WSe2) material-based nanocomposite (NC) film working as an active layer prepared through dispersion method. The photodetector is fabricated on an ITO-coated glass substrate. A spin coater is utilized for the film (NC) deposition, followed by aluminum (Al) electrode deposition in a thermal evaporation unit. The proposed structure Al/m-MTDATA:WSe2:Alq3/ITO-coated glass-based broadband photodetector exhibits a broad photo response with maximum responsivity <inline-formula><tex-math>${{{bm{R}}}_{bm{S}}}$</tex-math></inline-formula> (A/W) of 523, 550, and 430 A/W; at 350 nm (UV), 550 nm (visible), and 850 nm (IR) at +1V bias. The device possesses the rise/fall time of 4.11 μs/2.55 μs at 350 nm, 0.27 μs/0.33 μs at 550 nm, and 1.17 μs/1.16 μs at 850 nm. The proposed organic–inorganic NC has encouraging properties for optoelectronic applications.","PeriodicalId":13014,"journal":{"name":"IEEE Sensors Letters","volume":"9 5","pages":"1-4"},"PeriodicalIF":2.2,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Standardizing Number of EEG Sensors for AI-Driven Dementia Detection 面向ai驱动的痴呆检测的标准化脑电传感器数量

IF 2.2

IEEE Sensors Letters Pub Date : 2025-04-14 DOI: 10.1109/LSENS.2025.3560259

Quoc-Toan Nguyen

引用次数: 0

Highly Stretchable, Sensitive, and Robust Wearable Strain Sensor Based on CNTs/AgNWs Nanocomposite for Health and Fitness Monitoring 用于健康和健身监测的基于CNTs/AgNWs纳米复合材料的高可拉伸、敏感和坚固的可穿戴应变传感器

IF 2.2

IEEE Sensors Letters Pub Date : 2025-04-14 DOI: 10.1109/LSENS.2025.3560735

Jagan Singh Meena;Lucas Lum Yu Xiang;Yeow Kheng Lim

{"title":"Highly Stretchable, Sensitive, and Robust Wearable Strain Sensor Based on CNTs/AgNWs Nanocomposite for Health and Fitness Monitoring","authors":"Jagan Singh Meena;Lucas Lum Yu Xiang;Yeow Kheng Lim","doi":"10.1109/LSENS.2025.3560735","DOIUrl":"https://doi.org/10.1109/LSENS.2025.3560735","url":null,"abstract":"This letter reports a resistive-type wearable strain sensor fabricated using an electrically conductive hybrid network of single-walled carbon nanotubes (CNTs) and silver nanowires (AgNWs). AgNWs degrade over time due to silver corrosion in ambient conditions, leading to electrode failure. To mitigate this issue, CNTs were incorporated as a protective shield, effectively interlinking the AgNWs. This not only improved the stability and durability of the AgNWs but also resulted in a robust and highly conductive CNTs/AgNWs hybrid network. The hierarchical CNTs/AgNWs-based strain sensor exhibited better performance, achieving a large elongation of up to 100% with high sensitivity, demonstrated by a gauge factor (GF) of 79. It also featured a fast response time of 42 ms and outstanding mechanical stability, maintaining performance over 5000 stretch-release cycles. The sensor's performance was assessed under normal environmental conditions for a period of 180 days (approximately 6 months), showing minimal degradation in GF. This provides valuable insights into long-term changes, aiding the development of more robust, durable, and reliable nanocomposite-based strain sensors for practical applications. The sensor was used to monitor various human motions, including finger, throat, and elbow movements.","PeriodicalId":13014,"journal":{"name":"IEEE Sensors Letters","volume":"9 5","pages":"1-4"},"PeriodicalIF":2.2,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0