Human skin exhibits a remarkable capability to perceive contact forces and environmental temperatures,providing complex information that is essential for its subtle control.Despite recent advancements in soft tactile ...Human skin exhibits a remarkable capability to perceive contact forces and environmental temperatures,providing complex information that is essential for its subtle control.Despite recent advancements in soft tactile sensors,accurately decoupling signals—specifically separating forces from directional orientation and temperature—remains a challenge thus resulting in failure to meet the advanced application requirements of robots.This study proposes,F3T,a multilayer soft sensor unit designed to achieve isolated measurements and mathematical decoupling of normal pressure,omnidirectional tangential forces,and temperature.We developed a circular coaxial magnetic film featuring a floating mount multilayer capacitor that facilitated the physical decoupling of normal and tangential forces in all directions.Additionally,we incorporated an ion gel-based temperature-sensing film into the tactile sensor.The proposed sensor was resilient to external pressures and deformations,and could measure temperature and significantly eliminate capacitor errors induced by environmental temperature changes.In conclusion,our novel design allowed for the decoupled measurement of multiple signals,laying the foundation for advancements in high-level robotic motion control,autonomous decision-making,and task planning.展开更多
Monitoring high-temperature vibrations is critical in aerospace engineering,industrial manufacturing,and energy production,where harsh conditions necessitate robust vibration sensors for detecting anomalous signals.Ho...Monitoring high-temperature vibrations is critical in aerospace engineering,industrial manufacturing,and energy production,where harsh conditions necessitate robust vibration sensors for detecting anomalous signals.However,the accuracy of such sensors is often compromised by crosstalk between temperature and vibration signals.This study introduces a high-temperature vibration sensor based on langasite(LGS)surface acoustic wave(SAW)technology,designed to withstand temperatures up to 500℃.The sensor demonstrates high sensitivity,ranging from 12.54 kHz/g at 25℃ to 15.63 k Hz/g at 500℃.A comprehensive mechanical and electrical coupling model for the SAW vibration sensor was developed by integrating theoretical equations with numerical simulations to optimize the sensor's performance.Additionally,a novel decoupling algorithm for temperature and vibration was established,achieving thermomechanical decoupling with precise vibration parameters.Experimental results indicated a maximum relative deviation of 4.67%for the algorithm.In conclusion,the proposed LGS SAW vibration sensor emerges as a promising solution for the accurate detection of multiple parameters in high-temperature vibration monitoring.展开更多
A novel optical fiber hydrogen sensor based on theπ-phase-shifted grating and partial coated Pd/Hf composite film is proposed and experimentally demonstrated in this paper.The hydrogen sensitive Pd/Hf film with the l...A novel optical fiber hydrogen sensor based on theπ-phase-shifted grating and partial coated Pd/Hf composite film is proposed and experimentally demonstrated in this paper.The hydrogen sensitive Pd/Hf film with the length of 4 mm is successfully deposited in theπ-phase-shifted grating region by the magnetron sputtering process and rotating fixture technology.Since the hydrogen sensitivity between the notch and flank wavelengths of theπ-phase-shifted grating is different due to the partial coating only on theπ-phase-shifted grating region,the relative shift between the notch and flank wavelengths is employed to characterize the hydrogen concentration in this paper.The hydrogen calibration results show that the sensor shows the good response and repeatability.At the temperature of 20 and℃the hydrogen concentration of 2%,the wavelength distance shifts of 200 nm and 500 nm Pd/Hf coatings are 12.6 pm and 33.5 pm,respectively.展开更多
基金support by Hong Kong RGC General Research Fund(16217824,16213825,16203923,and 16217824)National Natural Science Foundation of China(N_HKUST638/23)+1 种基金Research Grants Council Joint Research Scheme(62361166630)Guangdong Basic and Applied Basic Research Foundation(2023B1515130007).
文摘Human skin exhibits a remarkable capability to perceive contact forces and environmental temperatures,providing complex information that is essential for its subtle control.Despite recent advancements in soft tactile sensors,accurately decoupling signals—specifically separating forces from directional orientation and temperature—remains a challenge thus resulting in failure to meet the advanced application requirements of robots.This study proposes,F3T,a multilayer soft sensor unit designed to achieve isolated measurements and mathematical decoupling of normal pressure,omnidirectional tangential forces,and temperature.We developed a circular coaxial magnetic film featuring a floating mount multilayer capacitor that facilitated the physical decoupling of normal and tangential forces in all directions.Additionally,we incorporated an ion gel-based temperature-sensing film into the tactile sensor.The proposed sensor was resilient to external pressures and deformations,and could measure temperature and significantly eliminate capacitor errors induced by environmental temperature changes.In conclusion,our novel design allowed for the decoupled measurement of multiple signals,laying the foundation for advancements in high-level robotic motion control,autonomous decision-making,and task planning.
基金supported by the National Natural Science Foundation of China(Grant Nos.U1837209 and 52105594)the Fundamental Research Program of Shanxi Province(Grant No.20210302124274)+4 种基金the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(Grant No.2023L361)the Outstanding Young Talents Support Plan of Shanxi Provincethe Young Sanjin Scholar Distinguished Professor Plan of Shanxi Provincethe Innovative Research Group Project of the National Natural Science Foundation of China(Grant No.51821003)the Shanxi‘1331 Project’Key Subjects Construction。
文摘Monitoring high-temperature vibrations is critical in aerospace engineering,industrial manufacturing,and energy production,where harsh conditions necessitate robust vibration sensors for detecting anomalous signals.However,the accuracy of such sensors is often compromised by crosstalk between temperature and vibration signals.This study introduces a high-temperature vibration sensor based on langasite(LGS)surface acoustic wave(SAW)technology,designed to withstand temperatures up to 500℃.The sensor demonstrates high sensitivity,ranging from 12.54 kHz/g at 25℃ to 15.63 k Hz/g at 500℃.A comprehensive mechanical and electrical coupling model for the SAW vibration sensor was developed by integrating theoretical equations with numerical simulations to optimize the sensor's performance.Additionally,a novel decoupling algorithm for temperature and vibration was established,achieving thermomechanical decoupling with precise vibration parameters.Experimental results indicated a maximum relative deviation of 4.67%for the algorithm.In conclusion,the proposed LGS SAW vibration sensor emerges as a promising solution for the accurate detection of multiple parameters in high-temperature vibration monitoring.
基金supported in part by the National Natural Science Foundation of China(Grant No.62025505)in part by the National Science Fund for Distinguished Young Scholars of China(Grant No.62061136002)in part by Deutsche Forschungsgemeinschaft(DFG),Germany(Grant No.448330062).
文摘A novel optical fiber hydrogen sensor based on theπ-phase-shifted grating and partial coated Pd/Hf composite film is proposed and experimentally demonstrated in this paper.The hydrogen sensitive Pd/Hf film with the length of 4 mm is successfully deposited in theπ-phase-shifted grating region by the magnetron sputtering process and rotating fixture technology.Since the hydrogen sensitivity between the notch and flank wavelengths of theπ-phase-shifted grating is different due to the partial coating only on theπ-phase-shifted grating region,the relative shift between the notch and flank wavelengths is employed to characterize the hydrogen concentration in this paper.The hydrogen calibration results show that the sensor shows the good response and repeatability.At the temperature of 20 and℃the hydrogen concentration of 2%,the wavelength distance shifts of 200 nm and 500 nm Pd/Hf coatings are 12.6 pm and 33.5 pm,respectively.
