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Flexible Multifunctional sensor for Robotic Perception: Integrating Material Recognition and Tactile Sensing

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2024年 73卷 1页

作者： Wang, Zuowei Zhang, Fuzheng Lin, Qijing Yang, Haolin Wang, Chenying Tian, Bian Zhao, Libo Maeda, Ryutaro Hanein, Yael Jiang, Zhuangde Xi An Jiao Tong Univ State Key Lab Mfg Syst Engn Int Joint Lab Micro Nano Mfg & Measurement Technol Xian 710049 Peoples R China Xi An Jiao Tong Univ Sch Mech Engn Xian 710049 Peoples R China Xian Jiaotong Univ Yantai State Key Lab Mfg Syst Engn Shandong Lab Yantai Adv Mat & Green Mfg Yantai 265503 Peoples R China Xi An Jiao Tong Univ Sch Instrument Sci & Technol Xian 710049 Peoples R China Tel Aviv Univ Sagol Sch Neurosci Sch Elect Engn IL-69978 Tel Aviv Israel Tel Aviv Univ Ctr Nanosci & Nanotechnol IL-69978 Tel Aviv Israel X Trodes IL-4672501 Herzliyya Israel

Flexible and compact sensors for collecting essential information from the environment are showing growing importance in robotic perception. In particular, flexible, multimodal, and low-form-factor sensors are among the major needs. In this article, a new sensor based on flexible printed circuits and flexible pressure-sensitive material was fabricated and characterized. To minimize fabrication complexity and improve reliability, the presented sensor builds on an established technology and a simple fabrication process. A layered device that can measure temperature, pressure, and surface material relative permittivity was designed, modeled, and tested. With a response time of 0.3 s, the sensor has high linearity in temperature measurement in the range of -30 degrees C to 120 degrees C. The sensor maintained its structural integrity and functional performance after undergoing a cumulative 10 h of exposure at 120 degrees C, demonstrating its resilience to harsh environments. In pressure measurement, the sensor monitors pressure from 0 to 65 kPa with a response time of 0.01 s, even after being overloaded approximately 50 times above the measuring range. In addition to tactile sensing, the sensor is integrated with the material recognition function based on relative permittivity measurement. This integration allows robots to recognize materials with relative permittivity between 1 and 9.3. Such functionality not only improves the adaptability of robots in various environments but also significantly augments their operational intelligence by providing crucial information about object materials, which is essential for complex task executions. Finally, the sensor was installed on a robotic gripper to simultaneously measure temperature, pressure, and material relative permittivity of surfaces. The flexible and lightweight sensor with its easy integration into robotic manipulators is promising for applications in intelligent sorting, smart factories, and intelligent prosthetic

关键词： Multisensory integration permittivity measurement pressure sensors robotics temperature sensors

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Eco-Conscious Approach to Wireless Gas Monitoring With a Hybrid Printed Passive sensor Tag

IEEE SENSORS LETTERS

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IEEE sensors LETTERS 2024年第6期8卷 1页

作者： Zikulnig, Johanna Malik, Muhammad-Hassan Rauter, Lukas Lenzhofer, Martin Carrar, Sandro Kosel, Jurgen Silicon Austria Labs GmbH A-9524 Villach Austria Ecole Polytech Fed Lausanne Bio CMOS Interfaces Lab EPFL CH-2000 Neuchatel Switzerland

Addressing the environmental impact of electronic waste in biomedical sensing, an eco-conscious approach to the realization of a Chitosan-based Acetone sensor tag for wireless gas monitoring is presented. The fabrication involves inkjet printing of silver electrodes and antennas on a bio-based, biocompatible, and biodegradable polylactic acid foil, as well as Chitosan coating for sensor functionalization. A hybrid approach is followed for the realization of the sensor readout by integrating a commercial, passive near-field-communication sensor chip on the printed sensor tag. Overcoming challenges in room temperature processing, the applicability and bonding adhesion strength of a commercial pressure-sensitive anisotropic adhesive film for flip-chip bonding is studied. With an average adhesion strength of 5.38 N, the proposed method exhibits great potential for ambient temperature flip-chip integration. Wireless measurements of the sensor show a linear response at an Acetone concentration between 0 and 31 ppm.

关键词： sensors Temperature sensors Gas detectors Antennas Substrates Wireless sensor networks Wireless communication sensor systems additive manufacturing eco-conscious sensors gas sensor hybrid integration point-of-care diagnostics single use technologies printed electronics wireless sensor

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Computationally efficient multi-type sensor placement for large-scale engineering structures

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING 2025年 230卷

作者： Swiercz, Andrzej Blachowski, Bartlomiej Olaszek, Piotr Holnicki-Szulc, Jan Jankowski, Lukasz Polish Acad Sci Inst Fundamental Technol Res Pawinskiego 5B PL-02106 Warsaw Poland Rd & Bridge Res Inst Ul Inst 1 PL-03302 Warsaw Poland

Performance of a structural health monitoring (SHM) system depends on the set of sensors distributed across the monitored structure. Optimal deployment of sensors on large-scale structures, such as tied-arch bridges, is a significant challenge. Condition assessment of a bridge is typically based on its displacement response under operational or diagnostic loads. However, direct displacement measurements require reference-based methods, which is problematic for bridges. Consequently, other sensor types that do not require reference points, such as accelerometers or inclinometers, are commonly used in practice. These sensors can indirectly provide displacement information but require sophisticated numerical integration and filtering techniques. Deploying a sensor network becomes even more challenging when it is heterogeneous and simultaneously utilizes sensors of various types. This paper proposes a sensor placement method for distributing such heterogeneous sensor networks. Two computationally efficient procedures are introduced, based on Kalman filtering and response estimation uncertainty. Their effectiveness is demonstrated using a realistic example of a tied-arch bridge located in Poland. One algorithm operates in a discrete greedy manner, while the other fuzzifies the sensor set to convert the originally discrete problem into a continuous one. Their numerical efficiency is related to the computationally inexpensive use of the cross-covariance matrix between the sensor responses and the target responses of interest. Compared to an existing multi-type sensor placement method, the proposed algorithms yield results of comparable quality with several times smaller computational cost.

关键词： sensor networks Optimal sensor placement Kalman filter Convex relaxation

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integration of an IoT sensor with angle-of-arrival-based angle measurement in AGV navigation: A reliability study

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JOURNAL OF INDUSTRIAL INFORMATION integration 2024年 42卷

作者： Cai, Zhen Zhang, Fanhang Tan, Yuan Kessler, Stephan Fottner, Johannes Tech Univ Munich Chair Mat Handling Mat Flow Logist Garching Germany Tech Univ Munich Sch Computat Informat & Technol Garching Germany Tech Univ Munich Chair Proc Syst Engn Freising Weihenstephan Germany

Automated guided vehicle (AGV), which was initially designed for indoor operations in industry, has been increasingly applied in outdoor heavy-duty logistics tasks. In typical navigation tasks, such as the autonomous tracking of a designated object or a person, relative angle and relative distance between AGV and the target is required. To obtain the necessary information, various on-board sensors are extensively integrated. In this paper, the reliability of measuring the relative angle with the Angle-of-Arrival (AoA) method with two different Internet of Things (IoT) sensor sets from Texas Instrument (TI) and u-blox, according to Bluetooth 5.1 was investigated. The performance of IoT sensors was validated with angle accuracy parameters and received signal strength indicator (RSSI). The better IoT sensor was then integrated into the AGV navigation system, and the information gathered from IoT sensor enabled the AGV to turn toward the direction of the target. The process of AGV turning to the targeted direction based on IoT sensor information was respectively tested in the simulation and actual environment and evaluated by the disparity between the real relative angle and the rotation angle of the AGV. The results showed that this disparity was within +/- 5 degrees in both simulated and actual environments, and methods for higher accuracy were proposed. In this way, the reliability and performance of Angle of Arrival (AoA) sensors in measuring the relative angle, which remains unexplored by other researchers, was systematically assessed contributing to extending the usability of AoA sensors in complex, real-world applications.

关键词： Automated guided vehicle Internet of things Bluetooth Angle-of-arrival Relative angle accuracy

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A Flexible Smart sensor System Based on Hybrid integration of Organic and Metal-Oxide Transistors

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IEEE sensors JOURNAL 2024年第12期24卷 19673-19683页

作者： Kang, Moon Hyo Nasrallah, Iyad Faraji, Sheida Garlapati, Suresh K. Rahmanudin, Aiman Tate, Daniel J. Saez, Glenn Sunley Persaud, Krishna C. Turner, Michael L. Sirringhaus, Henning Univ Cambridge Optoelect Grp Cavendish Lab Cambridge CB3 0HE England Dyson Technol Ltd Malmesbury SN16 0RP England Univ Manchester Organ Mat Innovat Ctr Manchester M13 9PL Lancs England Univ Manchester Dept Chem Engn Manchester M13 9PL Lancs England

Over the last decade, flexible electronic technology has been developed intensively and applied in sensor electronics. The use of sensors in a wide range of environments has been demanding a more compact and flexible platform. This article demonstrates a flexible smart sensor system integrating a p-type polymer field-effect transistor (FET) sensor and a flexible operational amplifier using complementary n-type metal-oxide and organic p-type FETs. The fabricated flexible operational amplifier (OpAmp) showed high differential voltage gain (>100 V/V) and successfully converted the sensing current to output voltage. The sensing functions are integrated in a thin and flexible card format with power provided by a small photovoltaic (PV) module and we demonstrate successful PV-powered operation and detection of gaseous molecular analytes, such as ethanol. The system detects the sensing current change from 114 nA (without ethanol) to 86 nA (with ethanol) and transforms to an output voltage of similar to 1.2 V through the OpAMP. The ethanol sensing output is displayed on an electrophoretic display (EPD) implemented in the system.

关键词： Complementary operational amplifier (OpAmp) flexible field-effect transistor (FET) gas sensor card indacenodithiophene-benzothiadiazole (IDT-BT) indium zinc oxide (IZO) poly[2,5-(2-octyldodecyl)-3,6-diketopyrrolopyrrole-alt-5,5[2,5-di(thien-2-yl)thieno][3,2-b]thiophene (DPPTTT)

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Surface Acoustic Wave sensor for Selective Multi-Parameter Measurements in Cardiac Magnetic Field Detection

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APPLIED SCIENCES-BASEL 2025年第7期15卷 3583-3583页

作者： Zhao, Hongbo Jiao, Chunxiao Wang, Qi Gao, Chao Sun, Jing Northeastern Univ Coll Sci Shenyang 110819 Peoples R China Northeastern Univ Sch Mat Sci & Engn Shenyang 110819 Peoples R China

Measuring parameters like heart temperature, heart rate, and cardiac magnetic field aids in analyzing cardiac health and disease. A multi-parameter sensor tailored to the heart can significantly enhance convenience in medical diagnosis and treatment. This work introduces a multi-parameter sensor based on Surface Acoustic Wave sensors (SAWSs) and magnetostrictive materials, designed to selectively measure various cardiac parameters. SAWSs are characterized by their compact dimensions, which facilitate integration into various medical devices. The wireless and passive characteristics of the sensors enable flexibility in the detection process. This sensor can detect various common physical quantities like weak magnetic fields by the control variable method, ensuring a high degree of accuracy. The working mode of SAWSs is investigated in this study, and the relationship curve concerning various influencing factors is established.

关键词： finite element simulation biosensor multi-parameter sensor surface acoustic wave sensor cardiac magnetic field

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Ultrathin flexible pressure sensors using microbead embedded nanofibrous membrane for wearable applications

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JOURNAL OF ALLOYS AND COMPOUNDS 2025年 1014卷

作者： Jin, Taiyu Pan, Yan Park, Sang-Hee Ko Fang, Da-Wei Liaoning Univ Inst Rare & Scattered Elements Coll Chem Shenyang 110036 Peoples R China Chinese Acad Sci Shenzhen Inst Adv Elect Mat Shenzhen Inst Adv Technol Shenzhen 518055 Peoples R China Korea Adv Inst Sci & Technol KAIST Dept Mat Sci & Engn Daejeon 34141 South Korea

With the increasing demand for real-time health monitoring driven by the popularity of wearable devices, there is a growing need for thin, flexible pressure sensors. In this study, we propose a strategy for developing a flexible ultrathin piezoresistive pressure sensor utilizing a composite of nanofibers and microbeads. The investigation primarily focuses on the effect of incorporating microbeads on nanofiber morphology and the correlation between the surface roughness of the nanofiber membrane and the performance of the pressure sensor. It has been elucidated that the integration of microbeads into nanofiber membranes enhances the performance of the pressure sensor. The prepared sensor has a sensitivity of 1.12 kPa-1, high stability that does not degrade after being pressed for more than 1000 times, and short response time (response/recovery times are 210 ms/140 ms, respectively) that is enough to detect human pulse. Furthermore, we have elaborated on how the choice of materials for the conductive layer, the coating technique, and the spraying duration impact the performance of the piezoresistive pressure sensor. Finally, we demonstrated that the ultrathin flexible pressure sensor can effectively operate on curved surfaces and has been successfully tested on human wrist pulses and carotid pulses. The successful fabrication of this sensor not only expands the fabrication techniques for pressure sensors but also enhances the performance of lightweight and thin pressure sensors, laying a technical foundation for developing pressure sensors suitable for portable devices.

关键词： Pressure sensor Nanofiber Microbead Electrospinning Wearable device Health monitoring

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Dependence of Rydberg-atom-based sensor performance on different Rydberg atom populations in one atomic-vapor cell

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Chinese Physics B 2024年第2期33卷 365-370页

作者：武博姚佳伟吴逢川安强付云起 College of Electronic Science and Technology National University of Defense TechnologyChangsha 410073China

The atomic-vapor cell is a vital component for Rydberg atomic microwave sensors,and impacts on overall capability of Rydberg ***,the conventional analysis approach on effect of vapor-cell length contains two implicit assumptions,that is,the same atomic population density and buffer gas pressure,which make it unable to accurately capture actual response about effect of Rydberg-atom-based sensor performance on different Rydberg atom ***,utilizing a stepped cesium atomic-vapor cell with five different dimensions at the same atomic population density and buffer gas pressure,the height and full width at half maximum of electromagnetically induced transparency(EIT)signal,and the sensitivity of the atomic superheterodyne sensor are comprehensively investigated under conditions of the same Rabi frequencies(saturated laser power).It is identified that EIT signal height is proportional to the cell length,full width at half maximum and sensitivity grow with the increment of cell length to a certain *** the coherent integration signal theory and atomic linear expansion coefficient method,theoretical analysis of the EIT height and sensitivity are further *** results could shed new light on understanding and design of ultrahigh-sensitivity Rydberg atomic microwave sensors and find promising applications in quantum measurement,communication,and imaging.

关键词： Rydberg atom population Rydberg-atom-based receiver stepped atomic-vapor cell

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Reliability Assessment and Multiphysics Simulation of Additively Printed Wearable Humidity sensor With Supercapacitive Material for Astronaut in Extreme Condition

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JOURNAL OF ELECTRONIC PACKAGING 2024年第4期146卷 041114页

作者： Lall, Pradeep Jang, Hyesoo Hill, Curtis Auburn Univ Elect Packaging Res Inst Auburn AL 36849 USA QuaniTech Inc Jacobs Space Explorat Grp ESSCA Contract NASA MSFC Huntsville AL 35808 USA

Additive technologies, such as aerosol jet printing (AJP) and direct write printing, are increasingly being used in the production of printed circuit boards because they eliminate the need for costly tooling, such as photomasks or etching containers. This is because additive methods allow for the direct deposition of printing materials onto a substrate. A design and manufacturing approach based on software also enables production flexibility, as well as speedier tool adjustments and design development. Moreover, additive printing methods could be used on a wide range of materials, including fabrics, vehicles, and polymers with various surfaces and forms. This versatility in a broad variety of applications allows engineers to create diverse applications, such as sensing devices with electro-cardiogram sensors, pulse- oxygen sensors, galvanic skin response sensors, body temperature sensors, humidity sensors, and so on. Due to its potential for adaptability and integration, the development of additively printed humidity sensors has been the subject of several prior investigations. There are still issues with the reliability of current humidity sensor technology when flexing force is coupled with the humidity sensor. For the avoidance of stability issues, it is required to develop a better printing technique, process recipe, and sensing material encapsulation. In this research, the direct-write (D-write) printing approach with an nScrypt printer was employed to print the humidity sensor as a test vehicle in a laboratory setting. The sensor was characterized by analyzing the print recipe and its interaction with humidity in regard to resistance and humidity sensitivity. Additionally, the characterization of sensor accuracy, hysteresis, linearity, and stability in relation to temperature and humidity variation has been measured. Furthermore, a multiphysics simulation model was created in order to comprehend the electrochemical processes that occur when the humidity sensor

关键词： Reliability Simulation sensors Water Capacitance Printing Temperature

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A Highly Sensitive pH sensor Based on Tapered Single-Mode Optical Fiber by Calcium Alginate Hydrogel Operating at Dispersion Turning Point

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IEEE sensors JOURNAL 2025年第1期25卷 569-576页

作者： Liu, Xue Wei, Yalong Xu, Wenyan Zhao, Yujia Wu, Bing Shi, Jie Zhang, Guoyu Chen, Ankang Li, Jing Cui, Lugui Peng, Feng Yang, Jun Univ Jinan Sch Phys & Technol Jinan 250022 Peoples R China Harbin Engn Univ Qingdao Innovat & Dev Ctr Qingdao 266500 Peoples R China Harbin Engn Univ Coll Phys & Optoelect Engn Harbin 150001 Peoples R China Univ Technol Adv Inst Photon Technol Sch Informat Engn Guangdong Guangzhou 510006 Peoples R China Univ Technol Guangdong Prov Key Lab Photon Informat Technol Guangzhou 510006 Peoples R China

A highly sensitive pH sensor based on a tapered single-mode optical fiber (SMF) working at the dispersion turning point (DTP) is proposed, with calcium alginate hydrogel coated on its surface. The tapered SMF is prepared using a two-step tapering method, and the pH sensor is fabricated by coating the surface of the tapered SMF with calcium alginate hydrogel. Experimental results demonstrate that within the pH range of 7.03-8.45, the sensor exhibits the highest sensitivity at the DTP, with a sensitivity of 115.6 nm/pH. Furthermore, this sensor boasts benefits, including excellent repeatability and rapid response time. Compared with other sensors, the proposed pH sensor demonstrates superior pH sensitivity, simple structure, and low cost, making it highly promising for applications in seawater monitoring and biomedical fields.

关键词： sensors Sensitivity Optical fiber sensors Hydrogels Refractive index Calcium Optical fibers Optical fiber dispersion Monitoring Biosensors Calcium alginate hydrogel dispersion turning point (DTP) optical fiber sensor pH sensor tapered single-mode optical fiber (SMF)

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