共查询到20条相似文献,搜索用时 140 毫秒
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光纤环形谐振腔环境温度变化带来的偏振波动噪声是影响谐振式光纤陀螺检测精度的主要光学噪声源之一,通过控制谐振腔温度,可以使偏振波动噪声得到有效抑制.为了抑制偏振波动噪声,减小R-FOG精度受FRR温度变化的影响,从理论上分析了谐振腔温度变化对谐振曲线、解调曲线的影响;针对不同温度下光纤环的谐振特性、解调曲线特性、陀螺零偏及零偏稳定性开展了实验,并对实验结果进行了分析.结果表明,谐振腔的工作温度为27.00℃时,两本征偏振态相距最远,总谐振曲线关于谐振频率点对称,谐振频率点检测误差可以忽略;陀螺零偏稳定性近似等于谐振腔温度为25.50℃时的1/100,在150 s的采样时间内达到0.07°/s,陀螺检测精度得到很大提高. 相似文献
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《传感器与微系统》2019,(5)
微机电系统(MEMS)陀螺的模态谐振频率和品质因子具有较强的温度敏感性,使得MEMS陀螺的输出零偏随温度漂移。为了解决零偏随温度漂移问题,提出了一种基于MEMS微机械陀螺的驱动谐振频率做温度基准的零偏温度补偿方法。温度在-40~60℃范围内变化,经多次循环测量陀螺零偏,获得零偏与温度之间的变化关系,并在此基础上,对零偏进行建模分析。利用谐振频率与温度的线性关系,以驱动谐振频率为温度参考,对陀螺零偏进行实时温度补偿。实验结果表明:上电零偏稳定性由补偿前的143. 81°/h变为补偿后的26. 51°/h,降低了5. 42倍;温度在-40~60℃范围内变化,补偿前后的零偏稳定性分别为1368. 05°/h和62. 86°/h,降低了22倍。 相似文献
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多晶硅固支梁是MEMS器件中较常见的可动部件,通过静电激励的方式对其进行疲劳振动加载;所用结构为面外运动结构,为了测试样品的加速疲劳特性,通过在固支梁面内引入缺陷的方式来增大应力水平值;器件在经历了1.72×1011次循环之后,微梁的谐振频率、振动幅度发生了较大偏移,其谐振频率的偏移量达到14.531 kHz,器件性能发生了严重的退化.研究结果表明,利用谐振频率的改变来表征材料性能的退化是一种准确、可行的方法,同时本文进一步分析指出,器件上引入凹槽缺陷的方法确实可起到加速疲劳的作用;可利用此方法制作不同应力水平幅度的结构进行振动载荷疲劳加载实验,从而得到固支梁结构疲劳加速因子. 相似文献
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基于LabVIEW的石英音叉陀螺闭环驱动的实现 总被引:2,自引:2,他引:0
分析了石英音叉陀螺驱动端幅频相频特性,设计了LabVIEW控制算法,使陀螺工作在最佳频率点;首先根据机电等效理论得出陀螺等效电路中串联支路电流等效于驱动端叉指振动速度,且串联支路电流在不同频率点处对频率的敏感度不同,然后通过对陀螺进行扫频得到了陀螺驱动端幅频相频特性,最后,基于在谐振频率点附近陀螺驱动端相频特性呈线性关系,设计了LabVIEW控制算法;根据该算法.设置相位分别为0°和~4°,40min内这两个谐振频率点处驱动反馈信号的标准差分别为1.4728e-005v、1.9229e-005v(1σ),因此,0相位处为较理想工作点,设置参考相位为各个谐振频率点的对应相位,通过比较可确定陀螺的最佳谐振频率点,提高陀螺驱动端的振动稳定性. 相似文献
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提出了一种基于TiN双谐振梁结构的MEMS谐振式压力传感器,利用TiN谐振梁的谐振频率与被测压力的关系进行压力测量。针对传感器的敏感结构建立了数学模型,通过理论分析和ANSYS有限元软件的模拟,得出了谐振梁长度的变化范围和谐振梁的结构参数,并确定了TiN谐振梁在矩形压力膜上方的最佳位置。这对传感器的结构设计具有重要的指导意义。 相似文献
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对于线振动硅微机电系统(MEMS)陀螺,真空封装是减小其振动阻尼、提高振动品质因数,进而提高性能的一种有效的措施。设计了一种基于钎焊的硅MEMS陀螺真空封装方案,该方案因不采用吸气剂,故可实现真空度可控。理论计算表明:该封装形式可以保持1 Pa以下的真空度;经过对真空封装后的陀螺实验测试结果表明:设计的陀螺驱动轴品质因数为1500,实际封装后的陀螺驱动轴品质因数为1700,满足真空度设计目标。经过对封装后的陀螺品质因数进行186 d的跟踪测试,品质因数基本保持不变,验证了该真空封装方案的可靠性。 相似文献
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Zhanqiang Hou Xuezhong Wu Dingbang Xiao Zhihua Chen Jianbin Su 《Microsystem Technologies》2014,20(2):227-234
This paper reports a method for improving the temperature performance of micromachined gyroscopes by using a transition interface between the sensitive structure and the vacuumed package. We analyzed the effect of transition interface on the thermal stress of the micromachined gyroscopes. The temperature dependence of the static capacitance, resonant frequency and zero output were experimentally studied over the range ?40 to 60 °C. A micromachined gyroscope suspended by a slanted beam was adopted in the experiment. In order to identify how the factors affect the temperature performance of the micromachined gyroscope, two types of the introduced gyroscopes were characterized. One was the original gyroscope having no transition interface, and the other was using 2 mm silicon as the transition interface. In contrast to the original gyroscope having no transition interface, the static capacitance and resonant frequency of the gyroscope adopting transition interface had a smaller temperature coefficient, especially for the static capacitance which has more than an order of magnitude improvement. As a result, the bias instability of the gyroscope improved to a higher level over temperature variations. It would provide a convenient and practical method for improving the temperature performance of micromachined gyroscopes. 相似文献
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Thermal-dependent frequency stability of a linear-vibration gyroscope, based on elastic theory of thin plate, is studied. As an elastic structure, the resonant frequency of the gyroscope is determined by the secant coefficient of thermal expansion of the material in which the gyroscope is made. For decreasing the frequency variation under different temperatures, the gyroscope can be changed in its structure to eliminate the thermal stress caused by mismatch of materials the gyroscope made in. Two gyroscopes with straight-beam and folded-beam supporting respectively are designed and analyzed. When replacing straight-beam by folded-beam in the gyroscope, the frequency variation of the gyroscope decreases. The two structures then are manufactured for testing. The testing shows the same result as analysis. 相似文献
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微机械陀螺的仿真与优化 总被引:4,自引:0,他引:4
微机械陀螺依靠振动模态频率来测量旋转角速度,通常微机械结构的振动模态相当复杂。虽然已有很多文章研究了如何调节驱动模态和敏感模态以获得最大的敏感度,却很少有人分析微机械陀螺的振动模态。振动模态与陀螺结构的设计参数有极大的关系,这些参数包括陀螺检测质量的尺寸、支撑系统的类型和尺寸,以及用以制造陀螺主体的多晶硅的残余应力。研究了一个静电驱动、电容检测、敏感垂直轴角速度的陀螺(也称平面陀螺)。同时,用有限元法分析法对微机械陀螺的结构进行了分析。 相似文献
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This paper presents a detailed model for possible vibration effects on MEMS degenerate gyroscopes represented by vibratory ring gyroscopes. Ring gyroscopes are believed to be relatively vibration-insensitive because the vibration modes utilized during gyro operation are decoupled from the modes excited by environmental vibration. Our model incorporates four vibration modes needed to describe vibration-induced errors: two flexural modes (for gyro operation) and two translation modes (excited by external vibration). The four-mode dynamical model for ring gyroscopes is derived using Lagrange's equations. The model considers all elements comprising a ring gyroscope, namely the ring structure, the support-spring structures, and the electrodes that surround the ring structure. Inspection of this model demonstrates that the output of a ring gyroscope is fundamentally insensitive to vibration due to the decoupled dynamics governing ring translation versus ring flexure, however, becomes vibration-sensitive in the presence of non-proportional damping and/or capacitive nonlinearity at the sense electrodes. 相似文献