Without adding feedback to modulate light path system, the dissymmetrical 3×3 coupled optical accelerometer reduces the complexity of the design of light path system. Experiments prove that it can attain good dem...Without adding feedback to modulate light path system, the dissymmetrical 3×3 coupled optical accelerometer reduces the complexity of the design of light path system. Experiments prove that it can attain good demodulation effects. As carrier is not needed in this system, the frequency range of input signal is diminished so as to decrease the sampling frequency of accelerometer. This makes for the system on programmable chip(SOPC) design of digital demodulating system. The upper limit of accelerometer working frequency can reach 3 500 Hz. But affected by the inherent frequency of sensitive components, its working frequency is 10 Hz^1 000 Hz, and the sensitivity is 8.718 0 V/(m·s-2). This accelerometer can detect the dynamic range of acceleration signal real-timely, steadily and accurately, solving the dissymmetrical problem of light path caused by circumstances and the complexity of process.展开更多
The mechanical structure of piezoelectric accelerometer is designed, and the operation equations on X , Y , and Z axes are deduced. The test results of 3 D frequency response are given. Noise disturbances are effectiv...The mechanical structure of piezoelectric accelerometer is designed, and the operation equations on X , Y , and Z axes are deduced. The test results of 3 D frequency response are given. Noise disturbances are effectively eliminated by using fiber optic transmission and synchronous detection.展开更多
A new scheme is proposed to model 3D angular motion of a revolving regular object with miniature, low-cost micro electro mechanical systems(MEMS) accelerometers(instead of gyroscope),which is employed in 3D mouse syst...A new scheme is proposed to model 3D angular motion of a revolving regular object with miniature, low-cost micro electro mechanical systems(MEMS) accelerometers(instead of gyroscope),which is employed in 3D mouse system.To sense 3D angular motion,the static property of MEMS accelerometer,sensitive to gravity acceleration,is exploited.With the three outputs of configured accelerometers,the proposed model is implemented to get the rotary motion of the rigid object.In order to validate the effectiveness of the proposed model,an input device is developed with the configuration of the scheme.Experimental results show that a simulated 3D cube can accurately track the rotation of the input device.The result indicates the feasibility and effectiveness of the proposed model in the 3D mouse system.展开更多
In order to realize a high accuracy seismic exploration in the high electro-magnetic field and to improve oil producibility and recovery efficiency,a three-component photoelastic waveguide accelerometer is designed. B...In order to realize a high accuracy seismic exploration in the high electro-magnetic field and to improve oil producibility and recovery efficiency,a three-component photoelastic waveguide accelerometer is designed. Based on the photoelastic effect,the Mach-Zehnder integrated optical interferometer is designed to measure the three-orthogonal components of acceleration and the combined three-component simple harmonic vibrator is designed to reduce the cross-talk among the acceleration components. According to the variation of LiNbO3 waveguide phase under the action of the applied acceleration,the cross-axise sensitivity and transverse sensitivity ratio(TSR) were analysed. The results reveal that the accelerometer has wide band and good linearity. It can satisfy the sensor requirements of high accuracy seismic exploration. The main design parameters of the geophone system are:phase sensitivity:1.86×10-4 Rad·m-1·s-2,natural frequency:3 500 Hz,and the transverse sensitivity ratio:0.11%.展开更多
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
基于CSMC0.5um CMOS工艺,给出了一款3轴电容式微加速度计接口ASIC的详细设计方案。利用时分复用技术实现了使用同一电路模块同时检测3个轴向的加速度信号,利用相关双倍采样技术提高了电容电压转换的分辨率,利用Sigma_Delta调制技术对电...基于CSMC0.5um CMOS工艺,给出了一款3轴电容式微加速度计接口ASIC的详细设计方案。利用时分复用技术实现了使用同一电路模块同时检测3个轴向的加速度信号,利用相关双倍采样技术提高了电容电压转换的分辨率,利用Sigma_Delta调制技术对电路噪声进行有效整形。仿真得到系统的分辨率为0.91 a F/Hz1/2,3个轴向的噪声密度分别为43.60μg/Hz1/2、43.60μg/Hz1/2和45.70μg/Hz1/2,3个轴向输出数字脉冲信号占空比的非线性度分别为1.38%、0.91%和1.79%。展开更多
文摘Without adding feedback to modulate light path system, the dissymmetrical 3×3 coupled optical accelerometer reduces the complexity of the design of light path system. Experiments prove that it can attain good demodulation effects. As carrier is not needed in this system, the frequency range of input signal is diminished so as to decrease the sampling frequency of accelerometer. This makes for the system on programmable chip(SOPC) design of digital demodulating system. The upper limit of accelerometer working frequency can reach 3 500 Hz. But affected by the inherent frequency of sensitive components, its working frequency is 10 Hz^1 000 Hz, and the sensitivity is 8.718 0 V/(m·s-2). This accelerometer can detect the dynamic range of acceleration signal real-timely, steadily and accurately, solving the dissymmetrical problem of light path caused by circumstances and the complexity of process.
文摘The mechanical structure of piezoelectric accelerometer is designed, and the operation equations on X , Y , and Z axes are deduced. The test results of 3 D frequency response are given. Noise disturbances are effectively eliminated by using fiber optic transmission and synchronous detection.
文摘A new scheme is proposed to model 3D angular motion of a revolving regular object with miniature, low-cost micro electro mechanical systems(MEMS) accelerometers(instead of gyroscope),which is employed in 3D mouse system.To sense 3D angular motion,the static property of MEMS accelerometer,sensitive to gravity acceleration,is exploited.With the three outputs of configured accelerometers,the proposed model is implemented to get the rotary motion of the rigid object.In order to validate the effectiveness of the proposed model,an input device is developed with the configuration of the scheme.Experimental results show that a simulated 3D cube can accurately track the rotation of the input device.The result indicates the feasibility and effectiveness of the proposed model in the 3D mouse system.
基金The National Natural Science Foundation of China(40774067)The Program of International Cooperation and Exchange in National Natural Science Foundation of China(40811240167)The Program of the Key Science and Technology of Sichuan(07JY029-135)
文摘In order to realize a high accuracy seismic exploration in the high electro-magnetic field and to improve oil producibility and recovery efficiency,a three-component photoelastic waveguide accelerometer is designed. Based on the photoelastic effect,the Mach-Zehnder integrated optical interferometer is designed to measure the three-orthogonal components of acceleration and the combined three-component simple harmonic vibrator is designed to reduce the cross-talk among the acceleration components. According to the variation of LiNbO3 waveguide phase under the action of the applied acceleration,the cross-axise sensitivity and transverse sensitivity ratio(TSR) were analysed. The results reveal that the accelerometer has wide band and good linearity. It can satisfy the sensor requirements of high accuracy seismic exploration. The main design parameters of the geophone system are:phase sensitivity:1.86×10-4 Rad·m-1·s-2,natural frequency:3 500 Hz,and the transverse sensitivity ratio:0.11%.
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.
文摘基于CSMC0.5um CMOS工艺,给出了一款3轴电容式微加速度计接口ASIC的详细设计方案。利用时分复用技术实现了使用同一电路模块同时检测3个轴向的加速度信号,利用相关双倍采样技术提高了电容电压转换的分辨率,利用Sigma_Delta调制技术对电路噪声进行有效整形。仿真得到系统的分辨率为0.91 a F/Hz1/2,3个轴向的噪声密度分别为43.60μg/Hz1/2、43.60μg/Hz1/2和45.70μg/Hz1/2,3个轴向输出数字脉冲信号占空比的非线性度分别为1.38%、0.91%和1.79%。
