In this paper,a fast step heterodyne light-induced thermoelastic spectroscopy(SH-LITES)sensor using a high-frequency quartz tuning fork(QTF)with resonant frequency of~100 kHz is reported for the first time.The theoret...In this paper,a fast step heterodyne light-induced thermoelastic spectroscopy(SH-LITES)sensor using a high-frequency quartz tuning fork(QTF)with resonant frequency of~100 kHz is reported for the first time.The theoretical principle of heterodyne LITES(H-LITES)signal generation is analyzed firstly,and an acetylene(C2H2)H-LITES sensor is established to verify its performance.Experimental comparisons between the high-frequency QTF and a standard commercial QTF with resonant frequency of~32.768 kHz reveal that the high-frequency QTF exhibits a tenfold faster response time.Specifically,the H-LITES sensor with this QTF achieves a 33 ms measurement cycle,90%shorter than commercial counterparts.Furthermore,The SH-LITES technique is proposed to further shorten the scanning time to 15 ms,which achieves the shortest LITES measurement time known to date.To demonstrate its advantages in dynamic gas detection,an H2O-LITES system integrating both QTF types is constructed for real-time monitoring of H2O concentration during different respiration patterns.Comparative measurements show that the SH-LITES more accurately captures dynamic H2O concentration fluctuations during respiration,outperforming the commercial QTF-based H-LITES sensor in rapid response scenarios.展开更多
事件相机是一种新兴的传感器,同时具有高动态范围、低延迟、高时间分辨率、低数据冗余等特点,将事件相机运用到SLAM(simultaneous localization and mapping)技术中能够充分发挥其优势,打破传统传感器使用场景限制。为此,综述了多模态...事件相机是一种新兴的传感器,同时具有高动态范围、低延迟、高时间分辨率、低数据冗余等特点,将事件相机运用到SLAM(simultaneous localization and mapping)技术中能够充分发挥其优势,打破传统传感器使用场景限制。为此,综述了多模态融合事件相机SLAM技术的研究现状并分析各类方法的特点与缺陷。介绍了SLAM技术与事件相机的基本原理,阐述了事件相机相比传统视觉相机的优势;从单模态事件相机(单目、双目)和多模态融合事件相机(事件与惯性、视觉惯性、多源传感器融合)SLAM技术的角度出发,分析了两者在实时性、应用场景及算力需求上的优缺点并总结了各自的发展历程,而后探讨单一事件相机和多模态融合事件相机对系统性能的影响并给出了部分多模态融合事件相机的性能比较结果。最后,总结了多模态融合事件相机的SLAM技术未来的研究方向,如多模态事件SLAM算法优化与泛化能力提升、多源异构传感器深度融合架构扩展等,以此为事件相机在SLAM领域的应用提供一定的参考与借鉴。展开更多
The rapid advancement of wearable sensors necessitates ionically conductive hydrogels that simultaneously exhibit high stretchability,damage tolerance,and reliable adhesion.However,achieving these properties in a sing...The rapid advancement of wearable sensors necessitates ionically conductive hydrogels that simultaneously exhibit high stretchability,damage tolerance,and reliable adhesion.However,achieving these properties in a single material remains a significant challenge.Herein,we report an ionically conductive polyoxometalate(POM)-based hydrogel(PAA/L-arg@SIW)fabricated by incorporating L-arginine(L-arg)-modified silicotungstic acid nanocomplexes(L-arg@SIW)into a poly(acrylic acid)(PAA)network as a multifunctional dynamic crosslinker.Strong electrostatic interactions and hydrogen bonding between rigid L-arg@SIW nanoclusters and flexible PAA chains generate a three-dimensional hard-soft synergistic network,in which dynamic crosslinks preferentially rupture and re-form under mechanical loading,thereby dissipating energy and suppressing crack propagation.Consequently,the hydrogel exhibits exceptional stretchability(fracture strain>1500%),high toughness(1483kJ/m3),outstanding crack resistance(fracture energy up to 6.82 kJ/m2),and high ionic conductivity(0.15 S/m),along with robust adhesion to diverse substrates.Hydrogel-based sensors demonstrate high strain sensitivity(gauge factor(GF)=8.06),fast response,and excellent cyclic stability,enabling reliable monitoring of human motion and high-fidelity acquisition of electrocardiogram(ECG)and electromyogram(EMG)signals.This study presents an effective strategy for constructing high-performance ionically conductive hydrogels for wearable sensing applications.展开更多
Fabric-based pressure sensors offer high stability,low energy consumption,and excellent wearing com-fort,making them promise intelligent wearable devices and health monitoring.However,creating a fabric-based capacitiv...Fabric-based pressure sensors offer high stability,low energy consumption,and excellent wearing com-fort,making them promise intelligent wearable devices and health monitoring.However,creating a fabric-based capacitive pressure sensor that integrates high sensitivity,wide detection range,good air breathability,water vapour permeability,and low cost remains a challenge.In this study,a sensor two-scale synergistic resistive/capacitive hybrid response model is developed to analyze the sensor response factors at different pressing stages.It is proposed that fabric metal silver electrodes be prepared using the microdroplet jetting technology,combined with the sacrificial template method and mixed doping of active materials to prepare the dielectric layer.Results indicate the sensor achieves a high sensitivity of 2.872 kPa−1within a pressure range of 0-1 kPa,with an average air breathability of 61.69 mm/s and water vapour permeability of 3075.01 g/m224 h.Its applications in human motion monitoring and human-computer interaction highlight its potential in wearable technology.展开更多
基金financial supports from the National Natural Science Foundation of China(Grant No.62335006,62275065,624B2050,62022032,and 62405078)Open Subject of Hebei Key Laboratory of Advanced Laser Technology and Equipment(HBKL-ALTE2025001)+2 种基金Heilongjiang Postdoctoral Fund(Grant No.LBH-Z23144 and LBH-Z24155)Natural Science Foundation of Heilongjiang Province(Grant No.LH2024F031)China Postdoctoral Science Foundation(Grant No.2024M764172).
摘要In this paper,a fast step heterodyne light-induced thermoelastic spectroscopy(SH-LITES)sensor using a high-frequency quartz tuning fork(QTF)with resonant frequency of~100 kHz is reported for the first time.The theoretical principle of heterodyne LITES(H-LITES)signal generation is analyzed firstly,and an acetylene(C2H2)H-LITES sensor is established to verify its performance.Experimental comparisons between the high-frequency QTF and a standard commercial QTF with resonant frequency of~32.768 kHz reveal that the high-frequency QTF exhibits a tenfold faster response time.Specifically,the H-LITES sensor with this QTF achieves a 33 ms measurement cycle,90%shorter than commercial counterparts.Furthermore,The SH-LITES technique is proposed to further shorten the scanning time to 15 ms,which achieves the shortest LITES measurement time known to date.To demonstrate its advantages in dynamic gas detection,an H2O-LITES system integrating both QTF types is constructed for real-time monitoring of H2O concentration during different respiration patterns.Comparative measurements show that the SH-LITES more accurately captures dynamic H2O concentration fluctuations during respiration,outperforming the commercial QTF-based H-LITES sensor in rapid response scenarios.
摘要事件相机是一种新兴的传感器,同时具有高动态范围、低延迟、高时间分辨率、低数据冗余等特点,将事件相机运用到SLAM(simultaneous localization and mapping)技术中能够充分发挥其优势,打破传统传感器使用场景限制。为此,综述了多模态融合事件相机SLAM技术的研究现状并分析各类方法的特点与缺陷。介绍了SLAM技术与事件相机的基本原理,阐述了事件相机相比传统视觉相机的优势;从单模态事件相机(单目、双目)和多模态融合事件相机(事件与惯性、视觉惯性、多源传感器融合)SLAM技术的角度出发,分析了两者在实时性、应用场景及算力需求上的优缺点并总结了各自的发展历程,而后探讨单一事件相机和多模态融合事件相机对系统性能的影响并给出了部分多模态融合事件相机的性能比较结果。最后,总结了多模态融合事件相机的SLAM技术未来的研究方向,如多模态事件SLAM算法优化与泛化能力提升、多源异构传感器深度融合架构扩展等,以此为事件相机在SLAM领域的应用提供一定的参考与借鉴。
基金supported by the National Natural Science Foundation of China(Nos.22102139 and 22372143)Hebei Natural Science Foundation(Nos.B2025203022 and B2025203050)Science Research Project of the Hebei Education Department(No.JCZX2026028)。
摘要The rapid advancement of wearable sensors necessitates ionically conductive hydrogels that simultaneously exhibit high stretchability,damage tolerance,and reliable adhesion.However,achieving these properties in a single material remains a significant challenge.Herein,we report an ionically conductive polyoxometalate(POM)-based hydrogel(PAA/L-arg@SIW)fabricated by incorporating L-arginine(L-arg)-modified silicotungstic acid nanocomplexes(L-arg@SIW)into a poly(acrylic acid)(PAA)network as a multifunctional dynamic crosslinker.Strong electrostatic interactions and hydrogen bonding between rigid L-arg@SIW nanoclusters and flexible PAA chains generate a three-dimensional hard-soft synergistic network,in which dynamic crosslinks preferentially rupture and re-form under mechanical loading,thereby dissipating energy and suppressing crack propagation.Consequently,the hydrogel exhibits exceptional stretchability(fracture strain>1500%),high toughness(1483kJ/m3),outstanding crack resistance(fracture energy up to 6.82 kJ/m2),and high ionic conductivity(0.15 S/m),along with robust adhesion to diverse substrates.Hydrogel-based sensors demonstrate high strain sensitivity(gauge factor(GF)=8.06),fast response,and excellent cyclic stability,enabling reliable monitoring of human motion and high-fidelity acquisition of electrocardiogram(ECG)and electromyogram(EMG)signals.This study presents an effective strategy for constructing high-performance ionically conductive hydrogels for wearable sensing applications.
基金financially supported by the China Postdoctoral Science Foundation(No.2023M732827)the Natural Science Basic Research Program of Shaanxi(No.2023-JC-QN-0510)+2 种基金the Scientific Research Program Funded by Shaanxi Provincial Education Depart-ment(No.21JK0649)the Scientific Research Foundation for Doctor of Xi’an Polytechnic University(No.BS202057)the Innova-tion Foundation for Graduate of Xi’an Polytechnic University(No.chx2024007).
摘要Fabric-based pressure sensors offer high stability,low energy consumption,and excellent wearing com-fort,making them promise intelligent wearable devices and health monitoring.However,creating a fabric-based capacitive pressure sensor that integrates high sensitivity,wide detection range,good air breathability,water vapour permeability,and low cost remains a challenge.In this study,a sensor two-scale synergistic resistive/capacitive hybrid response model is developed to analyze the sensor response factors at different pressing stages.It is proposed that fabric metal silver electrodes be prepared using the microdroplet jetting technology,combined with the sacrificial template method and mixed doping of active materials to prepare the dielectric layer.Results indicate the sensor achieves a high sensitivity of 2.872 kPa−1within a pressure range of 0-1 kPa,with an average air breathability of 61.69 mm/s and water vapour permeability of 3075.01 g/m224 h.Its applications in human motion monitoring and human-computer interaction highlight its potential in wearable technology.