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本文详细介绍了一种利用微电子加工工艺制作的硅微型两自由度振动轮式陀螺仪的新结构 ,分析了该种陀螺仪的工作原理 ,推导了陀螺仪动力学方程 ,并讨论了梳状谐振器的工作机理和陀螺仪模拟力反馈的闭环控制方案 ;目前已制作完成了该型陀螺仪的原理样机 相似文献
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A tunable broadband metamaterial absorber is demonstrated at microwave frequencies in this paper.The metamaterial absorber is composed of ferrite slabs with large resonance beamwidths and a copper wire.The theoretical analysis for the effective media parameters is presented to show the mechanism for achieving the perfect absorptivity characteristic.The numerical results of transmission,reflectance,and absorptivity indicate that the metamaterial absorber exhibits a near perfect impedance-match to free space and a high absorptivity of 98.2% for one layer and 99.97% for two layers at 9.9 GHz.The bandwidth with the absorptivity above 90% is about 2.3 GHz.Moreover,the absorption band can be shifted linearly in a wide frequency range by adjusting the magnetic bias.This metamaterial absorber opens a way to prepare perfectly matched layers for engineering applications. 相似文献
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An integrated optical electric field sensor based on a Mach-Zehnder interferometer with the telescopic dipole is designed and fabricated, and its electrodes are segmented and connected with a telescopic dipole. The measured results show that when the frequency response is from 10 kHz to 6 GHz with the antenna length of 55 mm, the minimum detectable electric field of 20 mV/m can be obtained, and the linear dynamics range can reach 90 dB at 250 MHz. 相似文献
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Optical E-field probe using LiNbO_3 M-Z waveguides in the electromagnetic compatibility measurements
An integrated optical E-field probe with the segmented electrode using LiNbO3 Mach-Zehnder (M-Z) waveguides is proposed and an equivalent circuit of the segmented electrode is given. According to the circuit theory, the electrode structure of the probe is designed. The unpackaged size of the fabricated probe is as small as 60×6×0.5 (mm). The measured results show that the half wavelength voltage is 7.7 V, the±5 dB baseband range is 3 GHz, and the minimum detectable field is lower than 90 dB·μV/m (bandwidth 100 Hz). Therefore it can be used in the electromagnetic compatibility (EMC) measurements. 相似文献
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We design an isotropic electric-field sensing system using an optical probe. The optical probe consists of three electric-field sensors based on a Mach-Zehnder interferometer with the structure of segmented electrodes, which are perpendicular to each other. The measured results show that the ±5 dB baseband can reach 3 GHz, the linear dynamics range is 70dB, and the minimum detectable electric field is lower than 90 dBμ V/m (the spectrum analyser resolution is 100 Hz). The directional characteristics are almost isotropic within deviations of ±1.5 dB. Therefore this sensing system can be used in the electromagnetic compatibility measurements. 相似文献
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