Accelerometers are crucial sensors that measure acceleration resulting from motion or vibration.Compared with their electromechanical counterparts,optical accelerometers are widely regarded as the most promising techn...Accelerometers are crucial sensors that measure acceleration resulting from motion or vibration.Compared with their electromechanical counterparts,optical accelerometers are widely regarded as the most promising technology for high-requirement applications.However,compact integration of various optical and mechanical components to create a miniature optomechanical microsystem for acceleration sensing remains a challenge.In this study,we present a miniature optical fiber accelerometer based on a 3D microprinted ferrule-top Fabry–Pérot(FP)microinterferometer.In-situ 3D microprinting technology was developed to directly print a sub-millimeter-scale 3D proof mass/thin-film reflector-integrated FP microinterferometer on the inherently light-coupled end face of a fiber optic ferrule.Experimental results demonstrate that the optical fiber accelerometer has a flat response over a bandwidth of 2 to 3 kHz and its noise equivalent acceleration is 62.45μg/Hz under 1-g acceleration at 2 kHz.This ultracompact optical fiber interferometric accelerometer offers several distinct advantages,including immunity to electromagnetic interference,remote-sensing capability,and high customizability,making it highly promising for a variety of stringent acceleration-monitoring applications.展开更多
Identification of magnitude and orientation for spatially applied loading is highly desired in the fields of not only the machinery components but also human-machine interaction.Despite the fact that the 3-axis force ...Identification of magnitude and orientation for spatially applied loading is highly desired in the fields of not only the machinery components but also human-machine interaction.Despite the fact that the 3-axis force sensor with different structures has been proposed to measure the spatial force,there are still some common limitations including the multi-step manufacturing-assembly processes and complicated testing of decoupling calibration.Here,we propose a rapid fabrication strategy with low-cost to achieve high-precision 3-axis force sensors.The sensor is designed to compose of structural Maltese cross base and sensing units.It is directly fabricated within one step by a hybrid 3D printing technology combining deposition modeling(FDM)with direct-ink-writing(DIW).In particular,a machine learning(ML)model is used to convert the strain signal to the force components.Instead of a mount of calibration tests,this ML model is trained by sufficient simulation data based on programmed batch finite element modeling.This sensor is capable of continuously identifying a spatial force with varying magnitude and orientation,which successfully quantify the applied force of traditional Chinese medicine physiotherapy including Gua Sha and massage.This work provides insight for design and rapid fabrication of multi-axis force sensors,as well as potential applications.展开更多
研制了一种可用于油藏监测的3分量光纤加速度传感器。该传感器通过3个单方向传感单元分别获得3个正交方向上的被测加速度分量,每个传感单元是一质量-弹簧系统,通过波纹管与顺变材料构成复合弹性体,并采用光纤干涉结构将被测加速度通过...研制了一种可用于油藏监测的3分量光纤加速度传感器。该传感器通过3个单方向传感单元分别获得3个正交方向上的被测加速度分量,每个传感单元是一质量-弹簧系统,通过波纹管与顺变材料构成复合弹性体,并采用光纤干涉结构将被测加速度通过解调光纤中的相位变化反映出来。实验数据表明,该加速度传感器具有良好的线性度、一致性和稳定性。系统的工作频带范围为10 Hz至800 Hz,其轴向灵敏度为38 dB re rad/g,交叉法去敏度达到32 dB re rad/g,最小可检测加速度为39.3μg/Hz1/2。展开更多
基金supported by a grant from the Research Grants Council of Hong Kong SAR,China(Grant No.15213522).
文摘Accelerometers are crucial sensors that measure acceleration resulting from motion or vibration.Compared with their electromechanical counterparts,optical accelerometers are widely regarded as the most promising technology for high-requirement applications.However,compact integration of various optical and mechanical components to create a miniature optomechanical microsystem for acceleration sensing remains a challenge.In this study,we present a miniature optical fiber accelerometer based on a 3D microprinted ferrule-top Fabry–Pérot(FP)microinterferometer.In-situ 3D microprinting technology was developed to directly print a sub-millimeter-scale 3D proof mass/thin-film reflector-integrated FP microinterferometer on the inherently light-coupled end face of a fiber optic ferrule.Experimental results demonstrate that the optical fiber accelerometer has a flat response over a bandwidth of 2 to 3 kHz and its noise equivalent acceleration is 62.45μg/Hz under 1-g acceleration at 2 kHz.This ultracompact optical fiber interferometric accelerometer offers several distinct advantages,including immunity to electromagnetic interference,remote-sensing capability,and high customizability,making it highly promising for a variety of stringent acceleration-monitoring applications.
基金supported by the National Natural Science Foundation of China [12372078]Sixth Phase of Jiangsu Province"333 High Level Talent Training Project"Second Level Talents State Key Laboratory of Mechanics and Control of Mechanical Structures (Nanjing University of Aeronautics and astronautics [MCMS-E-0422G04].
文摘Identification of magnitude and orientation for spatially applied loading is highly desired in the fields of not only the machinery components but also human-machine interaction.Despite the fact that the 3-axis force sensor with different structures has been proposed to measure the spatial force,there are still some common limitations including the multi-step manufacturing-assembly processes and complicated testing of decoupling calibration.Here,we propose a rapid fabrication strategy with low-cost to achieve high-precision 3-axis force sensors.The sensor is designed to compose of structural Maltese cross base and sensing units.It is directly fabricated within one step by a hybrid 3D printing technology combining deposition modeling(FDM)with direct-ink-writing(DIW).In particular,a machine learning(ML)model is used to convert the strain signal to the force components.Instead of a mount of calibration tests,this ML model is trained by sufficient simulation data based on programmed batch finite element modeling.This sensor is capable of continuously identifying a spatial force with varying magnitude and orientation,which successfully quantify the applied force of traditional Chinese medicine physiotherapy including Gua Sha and massage.This work provides insight for design and rapid fabrication of multi-axis force sensors,as well as potential applications.
文摘研制了一种可用于油藏监测的3分量光纤加速度传感器。该传感器通过3个单方向传感单元分别获得3个正交方向上的被测加速度分量,每个传感单元是一质量-弹簧系统,通过波纹管与顺变材料构成复合弹性体,并采用光纤干涉结构将被测加速度通过解调光纤中的相位变化反映出来。实验数据表明,该加速度传感器具有良好的线性度、一致性和稳定性。系统的工作频带范围为10 Hz至800 Hz,其轴向灵敏度为38 dB re rad/g,交叉法去敏度达到32 dB re rad/g,最小可检测加速度为39.3μg/Hz1/2。
