Negative step response experimental method is used in wrist force sensor＇s dynamic performance calibration. The exciting manner of negative step response method is the same as wrist force sensor＇s load in working. T...Negative step response experimental method is used in wrist force sensor＇s dynamic performance calibration. The exciting manner of negative step response method is the same as wrist force sensor＇s load in working. This experimental method needn＇t special experiment equipments. Experiment＇s dynamic repeatability is good. So wrist force sensor＇s dynamic performance is suitable to be calibrated by negative step response method. A new correlation wavelet transfer method is studied. By wavelet transfer method, the signal is decomposed into two dimensional spaces of time-frequency. So the problem of negative step exciting energy concentrating in the low frequency band is solved. Correlation wavelet transfer doesn＇t require that wavelet primary function be orthogonal and needn＇t wavelet reconstruction. So analyzing efficiency is high. An experimental bench is designed and manufactured to load the wrist force sensor orthogonal excitation force/moment. A piezoelectric force sensor is used to setup soft trigger and calculate the value of negative step excitation. A wrist force sensor is calibrated. The pulse response function is calculated after negative step excitation and step response have been transformed to positive step excitation and step response. The pulse response function is transferred to frequency response function. The wrist force sensor＇s dynamic characteristics are identified by the frequency response function.展开更多
A numerical simulation model of plenoptic sensor aberration wavefront detection is established to simulate and analyze the detection performance of plenoptic sensor aberration wavefront for different turbulence intens...A numerical simulation model of plenoptic sensor aberration wavefront detection is established to simulate and analyze the detection performance of plenoptic sensor aberration wavefront for different turbulence intensities.The results show that the plenoptic sensor can achieve better distortion wavefront detection,and its wavefront detection accuracy improves with turbulence intensity.The unique optical structure design of the plenoptic sensor makes it more suitable for aberration wavefront detection in strong turbulent conditions.The wavefront detection performance of the plenoptic sensor is not only related to its wavefront reconstruction algorithm but also closely related to its structural parameter settings.The influence of structural parameters on the wavefront detection accuracy of plenoptic sensors under different turbulence intensities is simulated and analyzed.The variation law of wavefront detection accuracy and structural parameters under different turbulence intensities is summarized to provide a reference for the structural design and parameter optimization of plenoptic sensors.展开更多
High-performance gas sensing materials operated at room temperature(RT) are attractive for a variety of real-time gas monitoring applications,especially with the excellent durability and flexibility of wearable sensor...High-performance gas sensing materials operated at room temperature(RT) are attractive for a variety of real-time gas monitoring applications,especially with the excellent durability and flexibility of wearable sensor.The constructing heterostructure is one of the significant approaches in design strategies of sensing materials.This heterostructure effectively increases the active site for improving sensing performance and decreasing energy consumption.Herein,the heterostructure of Au nanoparticles modified CeO_(2)@carbon-quantum-dots(Au/CeO_(2)@CQDs) with a three-dimensional(3D) scaffold structure are successfully synthesized by an effective strategy,which can apply for preparing flexible gas sensor.The gas sensing properties of Au/CeO_(2)@CQDs based on flexible substrate are obtained under long-term repeated NO_(2) exposure at RT.Meanwhile,the long-term mechanical stability of this gas sensing device is also detected after different bending cycles.The Au/CeO_(2)@CQDs based on flexible substrate sensor exhibits excellent performance,including higher sensitivity(47.2),faster response(18 s)and recovery time(22 s) as well as longer-term stability than performance of pure materials.The obtained sensor also reveals outstanding mechanical flexibility,which is only a tiny response fluctuation(8.1%) after 500 bending/relaxing cycles.Therefore,our study demonstrates the enormous potential of this sensing materials for hazardous gas monitoring in future portable and wearable sensing platform.展开更多
The combined inclined rib pair(CIRP)is the first time proposed to improve the sensor performance of particle velocity sensor(PVS)by using a three-dimensional numerical method.The method is verified by the experiment r...The combined inclined rib pair(CIRP)is the first time proposed to improve the sensor performance of particle velocity sensor(PVS)by using a three-dimensional numerical method.The method is verified by the experiment results in the literature.The optimal plain channel parameters are determined as the basic sensor structure.In comparison of plain channel,both heat transfer characteristics and sensor performance are enhanced effectively by arranging the CIRP.The reason is that the high flow rate region caused by the CIRP can maintain strongly in the whole fluid field if there are enough rib pairs.Furthermore,the produced longitudinal vortex pair can get a better fluid mix,which is more conductive to heat transfer.The increasing height and number of the CIRP can improve the heat transfer characteristics,but the flow resistance will increase as well.For the purpose of finding the best overall performance,the effects of the parameters including the geometric sizes and the position of the CIRP have been investigated.The results show that PVS will get the best sensitivity when the rib length and width are 0.2 mm and 0.03 mm respectively,and the distance between rib pair and between ribs in the same pair are 0.15 mm and 0.3 mm respectively.Besides,the most suitable crossing angle is 45°.Thus,the performance of PVS can be significantly improved by this novel structure.展开更多
The statistical performance of AR high resolution array processor in presence of correlated sensor signal fluctuation is studied. Mean square inverse beam pattern and pointing error are examined. Special attention is ...The statistical performance of AR high resolution array processor in presence of correlated sensor signal fluctuation is studied. Mean square inverse beam pattern and pointing error are examined. Special attention is paid to the effects of reference sensor and correlation between sensors. It is shown that fluctuation causes broadening or even distortion of the mean square inverse beam pattern. Phase fluctuation causes pointing error. Its standard variance is proportional to that of fluctuation and is related to the number of sensors of the array. Correlation between sensors has important effects on pointing error.展开更多
The use of advanced carbon nanomaterials for flexible antenna sensors has attracted great attention due to their outstanding electromechanical properties. However, carbon nanomaterial based composites have yet to over...The use of advanced carbon nanomaterials for flexible antenna sensors has attracted great attention due to their outstanding electromechanical properties. However, carbon nanomaterial based composites have yet to overcome drawbacks, such as low conductivity and toughness. In this work, a flexible multi-layer graphene film(FGF) with a high conductivity of 10~6 S/m for antenna based wearable sensors is investigated. A 1.63 GHz FGF antenna sensor exhibits significantly high strain sensitivity of 9.8 for compressive bending and 9.36 for tensile bending, which is super than the copper antenna sensor(5.39 for compressive bending and 4.05 for tensile bending). Moreover, the FGF antenna sensor shows very good mechanical flexibility, reversible deformability and structure stability, and thus is well suited for applications like wearable devices and wireless strain sensing.展开更多
Wide-range vacuum sensors(0.1–10^(5) Pa)are crucial for a variety of applications,particularly in semiconductor equipment.However,existing sensors often face a trade-off between measurement range and accuracy,with so...Wide-range vacuum sensors(0.1–10^(5) Pa)are crucial for a variety of applications,particularly in semiconductor equipment.However,existing sensors often face a trade-off between measurement range and accuracy,with some offering a wide range at the expense of low accuracy,and others providing high accuracy within a limited range.This restricts their applicability in advanced technologies.The primary challenge lies in the sensitivity constraints at medium vacuum,the accuracy limitations at low vacuum,and the dependence of gas types.In this study,a new paradigm of high-performance wide-range MEMS diaphragm-based vacuum sensor is proposed,which is inherently small volume and independent of gas types.The sensor measures the vacuum pressure based on a two degree of freedom weak-coupling resonator,which operates in two distinct modes.In the range from 0.3 Pa to 10^(3) Pa,it works in mode-localized mode,where amplitude ratio serves as the output to enhance sensitivity and resolution.For pressure ranging from 10^(3) Pa to 10^(5) Pa,it works in traditional resonance mode,with frequency serving as the output to achieve high accuracy.Experimental results demonstrate that the proposed sensor outperforms conventional vacuum sensors.展开更多
基金National Hi-tech Research and Development Program of China(863 Program,No.2001AA42330).
文摘Negative step response experimental method is used in wrist force sensor＇s dynamic performance calibration. The exciting manner of negative step response method is the same as wrist force sensor＇s load in working. This experimental method needn＇t special experiment equipments. Experiment＇s dynamic repeatability is good. So wrist force sensor＇s dynamic performance is suitable to be calibrated by negative step response method. A new correlation wavelet transfer method is studied. By wavelet transfer method, the signal is decomposed into two dimensional spaces of time-frequency. So the problem of negative step exciting energy concentrating in the low frequency band is solved. Correlation wavelet transfer doesn＇t require that wavelet primary function be orthogonal and needn＇t wavelet reconstruction. So analyzing efficiency is high. An experimental bench is designed and manufactured to load the wrist force sensor orthogonal excitation force/moment. A piezoelectric force sensor is used to setup soft trigger and calculate the value of negative step excitation. A wrist force sensor is calibrated. The pulse response function is calculated after negative step excitation and step response have been transformed to positive step excitation and step response. The pulse response function is transferred to frequency response function. The wrist force sensor＇s dynamic characteristics are identified by the frequency response function.
基金the National Natural Science Foundation of China(No.61605223)the Strategic Priority Research Program of Chinese Academy of Sciences(No.614A010717)the Director Fund of Advanced Laser Technology Laboratory of Anhui Province(No.AHL2021ZR06)。
文摘A numerical simulation model of plenoptic sensor aberration wavefront detection is established to simulate and analyze the detection performance of plenoptic sensor aberration wavefront for different turbulence intensities.The results show that the plenoptic sensor can achieve better distortion wavefront detection,and its wavefront detection accuracy improves with turbulence intensity.The unique optical structure design of the plenoptic sensor makes it more suitable for aberration wavefront detection in strong turbulent conditions.The wavefront detection performance of the plenoptic sensor is not only related to its wavefront reconstruction algorithm but also closely related to its structural parameter settings.The influence of structural parameters on the wavefront detection accuracy of plenoptic sensors under different turbulence intensities is simulated and analyzed.The variation law of wavefront detection accuracy and structural parameters under different turbulence intensities is summarized to provide a reference for the structural design and parameter optimization of plenoptic sensors.
基金financially supported by the Natural Science Foundation of Shandong Province (Nos. ZR2021QB136 and ZR2022MH091)the Innovation and Entrepreneurship Training Program for Undergraduates of Shandong Province (No.S202110439100)+2 种基金Tai'an Science and Technology Innovation Development Project (No.2021GX068)the Academic Promotion Program of Shandong First Medical University (No. 2019QL008)the Chinese Academy of Sciences。
文摘High-performance gas sensing materials operated at room temperature(RT) are attractive for a variety of real-time gas monitoring applications,especially with the excellent durability and flexibility of wearable sensor.The constructing heterostructure is one of the significant approaches in design strategies of sensing materials.This heterostructure effectively increases the active site for improving sensing performance and decreasing energy consumption.Herein,the heterostructure of Au nanoparticles modified CeO_(2)@carbon-quantum-dots(Au/CeO_(2)@CQDs) with a three-dimensional(3D) scaffold structure are successfully synthesized by an effective strategy,which can apply for preparing flexible gas sensor.The gas sensing properties of Au/CeO_(2)@CQDs based on flexible substrate are obtained under long-term repeated NO_(2) exposure at RT.Meanwhile,the long-term mechanical stability of this gas sensing device is also detected after different bending cycles.The Au/CeO_(2)@CQDs based on flexible substrate sensor exhibits excellent performance,including higher sensitivity(47.2),faster response(18 s)and recovery time(22 s) as well as longer-term stability than performance of pure materials.The obtained sensor also reveals outstanding mechanical flexibility,which is only a tiny response fluctuation(8.1%) after 500 bending/relaxing cycles.Therefore,our study demonstrates the enormous potential of this sensing materials for hazardous gas monitoring in future portable and wearable sensing platform.
基金financially supported by the ScientificResearch and Development Program of City of Xiamen(3502Z20143003)the University-Industry Collaboration Program of Fujian Province,China(2015H6021)。
文摘The combined inclined rib pair(CIRP)is the first time proposed to improve the sensor performance of particle velocity sensor(PVS)by using a three-dimensional numerical method.The method is verified by the experiment results in the literature.The optimal plain channel parameters are determined as the basic sensor structure.In comparison of plain channel,both heat transfer characteristics and sensor performance are enhanced effectively by arranging the CIRP.The reason is that the high flow rate region caused by the CIRP can maintain strongly in the whole fluid field if there are enough rib pairs.Furthermore,the produced longitudinal vortex pair can get a better fluid mix,which is more conductive to heat transfer.The increasing height and number of the CIRP can improve the heat transfer characteristics,but the flow resistance will increase as well.For the purpose of finding the best overall performance,the effects of the parameters including the geometric sizes and the position of the CIRP have been investigated.The results show that PVS will get the best sensitivity when the rib length and width are 0.2 mm and 0.03 mm respectively,and the distance between rib pair and between ribs in the same pair are 0.15 mm and 0.3 mm respectively.Besides,the most suitable crossing angle is 45°.Thus,the performance of PVS can be significantly improved by this novel structure.
文摘The statistical performance of AR high resolution array processor in presence of correlated sensor signal fluctuation is studied. Mean square inverse beam pattern and pointing error are examined. Special attention is paid to the effects of reference sensor and correlation between sensors. It is shown that fluctuation causes broadening or even distortion of the mean square inverse beam pattern. Phase fluctuation causes pointing error. Its standard variance is proportional to that of fluctuation and is related to the number of sensors of the array. Correlation between sensors has important effects on pointing error.
基金supported by the National Natural Science Foundation of China(51701146)the Natural Science Foundation of Hubei Province of China(2015CFB719)the Fundamental Research Funds for the Central Universities(WUT:2017IB015)
文摘The use of advanced carbon nanomaterials for flexible antenna sensors has attracted great attention due to their outstanding electromechanical properties. However, carbon nanomaterial based composites have yet to overcome drawbacks, such as low conductivity and toughness. In this work, a flexible multi-layer graphene film(FGF) with a high conductivity of 10~6 S/m for antenna based wearable sensors is investigated. A 1.63 GHz FGF antenna sensor exhibits significantly high strain sensitivity of 9.8 for compressive bending and 9.36 for tensile bending, which is super than the copper antenna sensor(5.39 for compressive bending and 4.05 for tensile bending). Moreover, the FGF antenna sensor shows very good mechanical flexibility, reversible deformability and structure stability, and thus is well suited for applications like wearable devices and wireless strain sensing.
基金supported in part by the National Key R&D Program of China under Grant 2023YFC2410600in part by the National Natural Science Foundation of China under Grant 62301536 and Grant 62121003+2 种基金in part by the Youth Innovation Promotion Association CAS Grant 2023134 and Grant 2022121in part by the Instrument Research and Development of CAS under Grant PTYQ2024BJ0009in part by Science and Technology Program of Shandong Province under Grant 2023TSGC0211.
文摘Wide-range vacuum sensors(0.1–10^(5) Pa)are crucial for a variety of applications,particularly in semiconductor equipment.However,existing sensors often face a trade-off between measurement range and accuracy,with some offering a wide range at the expense of low accuracy,and others providing high accuracy within a limited range.This restricts their applicability in advanced technologies.The primary challenge lies in the sensitivity constraints at medium vacuum,the accuracy limitations at low vacuum,and the dependence of gas types.In this study,a new paradigm of high-performance wide-range MEMS diaphragm-based vacuum sensor is proposed,which is inherently small volume and independent of gas types.The sensor measures the vacuum pressure based on a two degree of freedom weak-coupling resonator,which operates in two distinct modes.In the range from 0.3 Pa to 10^(3) Pa,it works in mode-localized mode,where amplitude ratio serves as the output to enhance sensitivity and resolution.For pressure ranging from 10^(3) Pa to 10^(5) Pa,it works in traditional resonance mode,with frequency serving as the output to achieve high accuracy.Experimental results demonstrate that the proposed sensor outperforms conventional vacuum sensors.
