共查询到18条相似文献,搜索用时 421 毫秒
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利用微电子机械加工技术成功研制出电磁激励-电磁拾振硅谐振梁式压力传感器。传感器以"H"型双端固支梁为谐振器,采用差分检测结构。工艺制作采用体硅加工工艺,并且采用一种减小封装应力的结构完成压力传感器的真空密封及封装。利用锁相环微弱信号检测技术建立的开环频率特性测试系统及闭环自激测试系统测试了传感器的频率、压力特性等相关技术指标。谐振器在空气中的品质因素Q值大于1200;在真空中的Q值大于7000。压力满量程刻度为0~120kPa。差分输出的结果优于单个谐振梁的输出结果,差分输出结果的线性相关系数为0.9999,灵敏度为225.77Hz/kPa。 相似文献
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设计了悬臂梁结构电热激励、压阻拾取硅微机械谐振器件,分析了电热激励和压阻拾取的基本工作原理,设计了与Bipolar工艺兼容的器件制作工艺流程,并制作了器件样品.对真空中器件的幅频特性进行了实验研究,研究结果表明,在粗真空范围内,保持激励功率不变的情况下,微悬臂梁的振幅、谐振频率与真空度之间具有明显的依赖关系,可以用来设计、制作MEMS粗真空谐振式传感器. 相似文献
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压电谐振器是谐振式传感器和执行器的核心部件,通常工作在共振和稳幅状态。采用一种锁相环(PLL)和自动增益(AGC)相结合的双闭环控制驱动电路,分别实现了谐振器共振频率的跟踪激励和压电振子输出信号的稳幅控制。优化设计了双闭环电路中各元器件参数,使得压电振子能稳定工作在谐振频率点。参照压电谐振器开环测试数据和闭环测试数据,双闭环驱动电路能将谐振器相位锁定在59°(误差3°),输出信号峰峰值稳定在12.8V(误差0.2V)。实验结果表明,该电路设计能够达到稳定谐振器输出信号幅值和跟踪谐振器共振频率的目的。 相似文献
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Micromachined thermally based CMOS microsensors 总被引:5,自引:0,他引:5
Baltes H. Paul O. Brand O. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1998,86(8):1660-1678
An integrated circuit (IC) approach to thermal microsensors is presented. The focus is on thermal sensors with on-chip bias and signal conditioning circuits made by industrial complementary metal-oxide-semiconductor (CMOS) IC technology in combination with post-CMOS micromachining or deposition techniques. CMOS materials and physical effects pertinent to thermal sensors are summarized together with basic structures used for microheaters, thermistors, thermocouples, thermal isolation, and heat sinks. As examples of sensors using temperature measurement, we present micromachined CMOS radiation sensors and thermal converters. Examples for sensors based on thermal actuation include thermal flow and pressure sensors, as well as thermally excited microresonators for position and chemical sensing. We also address sensors for the characterization of process-dependent thermal properties of CMOS materials, such as thermal conductivity, Seebeck coefficient, and heat capacity, whose knowledge is indispensable for thermal sensor design. Last, two complete packaged microsystems-a thermoelectric air-flow sensor and a thermoelectric infrared intrusion detector-are reported as demonstrators 相似文献
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The electric field distribution in an automobile body must be known when developing an antenna system mounted inside the car body for mobile communication. A microwave simulation experiment was carried out in an electromagnetic anechoic chamber using 4 GHz band signals and a miniaturized automobile. The automobile model used in this simulation experiment was about 1/15 of the size of the actual automobile under consideration. A simpler box-type model with large apertures was also studied. The internal electric field distribution measured in the box model was estimated to be a combination of the resonant TEPmn modes excited in the box. which acted as a resonant cavity. The spatial and frequency dependence of the internal automobile's electromagnetic field for each model is plotted for the frequency range 3-5 GHz 相似文献