Proportional integrator (PI) is always adopted in the resonant frequency servo loop in a resonator micro optic gyro (RMOG). The oscillation phenomenon is observed when adjusting the loop gain surpassing a threshold. T...Proportional integrator (PI) is always adopted in the resonant frequency servo loop in a resonator micro optic gyro (RMOG). The oscillation phenomenon is observed when adjusting the loop gain surpassing a threshold. This phenomenon limits system performance on step response speed and residual error. Based on the experiment system, a simulation model was set up. Further analysis shows that the threshold gain is related to the system loop filter setting and the loop delay. The traditional PI frequency servo loop technique in the RMOG system cannot keep up with the environment's disturbance quickly enough, which leads to a large residual error. A compensating method is proposed to optimize the tracking performance, solve the oscillation problem, and speed up the system response. Simulation and experiment results show that the compensated system is superior in performance. It has less residual error in the stable state and is 10 times quicker than the uncompensated system on the step response.展开更多
研究了一种具有较宽机械调频范围和较低相位噪声的X波段介质振荡器设计方法。利用介质谐振器法对三种型号的介质谐振器(DR)材料进行了精确的测试,得到了其介电常数rε和损耗角正切值tanδ以及DR的谐振频率。利用仿真软件建立微带线与谐...研究了一种具有较宽机械调频范围和较低相位噪声的X波段介质振荡器设计方法。利用介质谐振器法对三种型号的介质谐振器(DR)材料进行了精确的测试,得到了其介电常数rε和损耗角正切值tanδ以及DR的谐振频率。利用仿真软件建立微带线与谐振器耦合模型,通过仿真提取其S2P文件。选用GaAs FET ATF26884作为电路中的放大器件,使用生成的S2P文件建立介质振荡器(DRO)电路模型,调整耦合段和输出匹配微带线的长度,得到较低的相位噪声。测试证明输出信号的相位噪声在偏离中心频率100 kHz处小于-100 dBc/Hz。展开更多
In view of the large scientific and technical interest in the microelectromechanical system(MEMS)accelerometer sensor and the limitations of capacitive,resistive piezo,and piezoelectric methods,we focus on the measure...In view of the large scientific and technical interest in the microelectromechanical system(MEMS)accelerometer sensor and the limitations of capacitive,resistive piezo,and piezoelectric methods,we focus on the measurement of the seismic mass displacement using a novel design of the all-optical sensor(AOS).The proposed AOS consists of two waveguides and a ring resonator in a two-dimensional rod-based photonic crystal(PhC)microstructure,and a holder which connects the central rod of a nanocavity to a proof mass.The photonic band structure of the AOS is calculated with the plane-wave expansion approach for TE and TM polarization modes,and the light wave propagation inside the sensor is analyzed by solving MaxwelFs equations using the finite-difference time-domain method.The results of our simulations demonstrate that the fundamental PhC has a free spectral range of about 730 nm covering the optical communication wavelength-bands.Simulations also show that the AOS has the resonant peak of 0.8 at 1.644μm,quality factor of 3288,full width at half maximum of 0.5nm,and figure of merit of 0.97.Furthermore,for the maximum 200nm nanocavity displacements in the x-or y-direction,the resonant wavelengths shift to 1.618μm and 1.547μm,respectively.We also calculate all characteristics of the nanocavity displacement in positive and negative directions of the jc-axis and y-axis.The small area of 104.35μm^(2)and short propagation time of the AOS make it an interesting sensor for various applications,especially in the vehicle navigation systems and aviation safety tools.展开更多
基金supported by the National High-Tech R & D Program (863) of China (No. 2008AA042602)the Fundamental Research Funds for the Central Universities, China (No. KYJD09035)
文摘Proportional integrator (PI) is always adopted in the resonant frequency servo loop in a resonator micro optic gyro (RMOG). The oscillation phenomenon is observed when adjusting the loop gain surpassing a threshold. This phenomenon limits system performance on step response speed and residual error. Based on the experiment system, a simulation model was set up. Further analysis shows that the threshold gain is related to the system loop filter setting and the loop delay. The traditional PI frequency servo loop technique in the RMOG system cannot keep up with the environment's disturbance quickly enough, which leads to a large residual error. A compensating method is proposed to optimize the tracking performance, solve the oscillation problem, and speed up the system response. Simulation and experiment results show that the compensated system is superior in performance. It has less residual error in the stable state and is 10 times quicker than the uncompensated system on the step response.
文摘研究了一种具有较宽机械调频范围和较低相位噪声的X波段介质振荡器设计方法。利用介质谐振器法对三种型号的介质谐振器(DR)材料进行了精确的测试,得到了其介电常数rε和损耗角正切值tanδ以及DR的谐振频率。利用仿真软件建立微带线与谐振器耦合模型,通过仿真提取其S2P文件。选用GaAs FET ATF26884作为电路中的放大器件,使用生成的S2P文件建立介质振荡器(DRO)电路模型,调整耦合段和输出匹配微带线的长度,得到较低的相位噪声。测试证明输出信号的相位噪声在偏离中心频率100 kHz处小于-100 dBc/Hz。
文摘In view of the large scientific and technical interest in the microelectromechanical system(MEMS)accelerometer sensor and the limitations of capacitive,resistive piezo,and piezoelectric methods,we focus on the measurement of the seismic mass displacement using a novel design of the all-optical sensor(AOS).The proposed AOS consists of two waveguides and a ring resonator in a two-dimensional rod-based photonic crystal(PhC)microstructure,and a holder which connects the central rod of a nanocavity to a proof mass.The photonic band structure of the AOS is calculated with the plane-wave expansion approach for TE and TM polarization modes,and the light wave propagation inside the sensor is analyzed by solving MaxwelFs equations using the finite-difference time-domain method.The results of our simulations demonstrate that the fundamental PhC has a free spectral range of about 730 nm covering the optical communication wavelength-bands.Simulations also show that the AOS has the resonant peak of 0.8 at 1.644μm,quality factor of 3288,full width at half maximum of 0.5nm,and figure of merit of 0.97.Furthermore,for the maximum 200nm nanocavity displacements in the x-or y-direction,the resonant wavelengths shift to 1.618μm and 1.547μm,respectively.We also calculate all characteristics of the nanocavity displacement in positive and negative directions of the jc-axis and y-axis.The small area of 104.35μm^(2)and short propagation time of the AOS make it an interesting sensor for various applications,especially in the vehicle navigation systems and aviation safety tools.
