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Proceedings IEEE Thirteenth Annual International Conference on Micro Electro Mechanical Systems (Cat. No.00CH36308)最新文献

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A CMOS z-axis capacitive accelerometer with comb-finger sensing 一种带梳状手指感应的CMOS z轴电容式加速度计
Huikai Xie, G. Fedder
This paper reports the first design and experimental results of a z-axis accelerometer that utilizes the sidewall capacitance change of multi-conductor comb fingers. The accelerometer has a fully differential capacitive bridge interface and its fabrication is compatible with standard CMOS processes. The frequency response of the accelerometer is characterized both electrically and optically and about 9.3 kHz resonant frequency is measured, which matches MEMCAD simulation within 15%. Measured sensitivity is 0.5 mV/g with less than -40 dB cross-axis sensitivity, noise floor 6 mg/rtHz, and linear range from -27 g to 27 g.
本文报道了一种利用多导体梳状指侧壁电容变化的z轴加速度计的初步设计和实验结果。加速度计具有全差分电容式桥接口,其制造与标准CMOS工艺兼容。从电学和光学两个方面对加速度计的频率响应进行了表征,测量到的谐振频率约为9.3 kHz,与MEMCAD仿真结果的匹配度在15%以内。测量灵敏度为0.5 mV/g,交叉轴灵敏度小于-40 dB,本底噪声为6 mg/rtHz,线性范围为-27 g至27 g。
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引用次数: 83
Electroplated rf MEMS capacitive switches 电镀rf MEMS电容开关
J.Y. Park, G. Kim, K. Chung, J. Bu
RF microswitches are newly designed and fabricated with various structural geometry of transmission line, hinge, and movable plate formed by using electroplating techniques, low temperature processes, and dry releasing techniques. In particular, Strontium Titanate Oxide (SrTiO/sub 3/) with high dielectric constant is investigated for high switching on/off ratio and on capacitance as a dielectric layer of a micromechanical capacitive switch. Achieved lowest actuation voltage of the fabricated switches is 8 volts. The fabricated switch has low insertion loss of 0.08 dB at 10 GHz, isolation of 42 dB at 5 GHz, on/off ratio of 600, and on capacitance of 50 pF, respectively. These switches also have high current carry capability due to the use of electroplated Au or Cux.
射频微动开关是采用电镀技术、低温工艺和干释放技术,将传输线、铰链、活动板等多种几何结构组合而成的新型射频微动开关。特别研究了具有高介电常数的钛酸锶氧化物(SrTiO/sub 3/)作为微机械电容开关的介电层具有较高的通断比和导通电容。所制开关的最低驱动电压为8伏。该开关在10 GHz时的插入损耗为0.08 dB,在5 GHz时的隔离度为42 dB,开/关比为600,导通电容为50 pF。由于使用电镀Au或Cux,这些开关也具有高电流承载能力。
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引用次数: 64
Mass flowmeter using a multi-sensor chip 质量流量计采用多传感器芯片
Yong Xu, C. Chiu, F. Jiang, Q. Lin, Y. Tai
We report here a novel mass flowmeter using a multisensor chip that includes a 1-D array of pressure, temperature and shear stress sensors. This shear stress sensor based flowmeter is capable of high sensitivity and wide measurement range. Our study also shows that the mass flowmeter using shear-stress sensors produces better resolution than that from pressure sensors in the laminar flow regime. Extensive tests have been carried out to evaluate the effects of overheat ratio, channel height and gas properties. We also find the V/sup 2//spl prop//spl tau//sup 1/3/ law for conventional hot film sensors does not hold for our micromachined shear stress sensor.
我们在此报告了一种新型的质量流量计,该流量计使用多传感器芯片,包括压力、温度和剪切应力传感器的一维阵列。这种基于剪切应力传感器的流量计具有高灵敏度和宽测量范围的特点。我们的研究还表明,使用剪切应力传感器的质量流量计比层流状态下使用压力传感器的质量流量计具有更好的分辨率。进行了大量的试验,以评估过热比、通道高度和气体性质的影响。我们还发现传统热膜传感器的V/sup 2//spl prop//spl tau//sup 1/3/定律不适用于我们的微机械剪切应力传感器。
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引用次数: 11
Torque measurement method using air turbine for micro devices 微器件用空气涡轮扭矩测量方法
H. Ota, L. Li, M. Takeda, H. Narumiya, T. Ohara, K. Namura
The authors have developed a general-purpose system that can measure very low torques in the order of 10/sup -7/ Nm. The new method proposed here uses wind pressure to apply a load to a turbine attached to the output shaft of the device. It can therefore be used for all rotating micro-devices. The use of wind pressure reduces the loss during measurement, and makes it possible to measure low levels of torque easily by simply attaching the turbine to the device. In the present study, the measuring principle of the new system was verified. In addition, a prototype micromotor 1.6 mm in diameter was fabricated and used to demonstrate that the new system was able to measure torques in the order of 10/sup -7/ Nm while the motor was in operation.
作者开发了一种通用系统,可以测量10/sup -7/ Nm量级的非常低的扭矩。这里提出的新方法是利用风压对连接在设备输出轴上的涡轮机施加负载。因此,它可以用于所有旋转的微型设备。使用风压减少了测量过程中的损失,并且可以通过简单地将涡轮机连接到设备上轻松地测量低水平的扭矩。在本研究中,验证了新系统的测量原理。此外,还制作了一个直径1.6 mm的微型电机原型,并用于证明新系统能够在电机运行时测量10/sup -7/ Nm量级的扭矩。
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引用次数: 1
A check-valved silicone diaphragm pump 单向阀硅胶隔膜泵
E. Meng, Xuan-Qi Wang, H. Mak, Y. Tai
Two generations of check-valved silicone rubber diaphragm pumps are presented. Significant improvements have been made from pump to pump including the design and fabrication of a double-sided check valve, a bossed silicone membrane, and silicone gaskets. Water flow rates of up to 13 ml/min and a maximum back pressure of 5.9 kPa were achieved through pneumatic operation with an external compressed air source. Using a custom designed solenoid actuator, flow rates of up to 4.5 ml/min and a maximum back pressure of 2.1 kPa have been demonstrated.
介绍了两代单向阀硅橡胶隔膜泵。从泵到泵都进行了重大改进,包括设计和制造双面止回阀,凸塞硅胶膜和硅胶垫圈。水流速度可达13毫升/分钟,最大背压为5.9千帕,通过外部压缩气源进行气动操作。使用定制设计的电磁执行器,流量可达4.5 ml/min,最大背压为2.1 kPa。
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引用次数: 50
Silicon carbide micro-reaction-sintering using a multilayer silicon mold 碳化硅微反应烧结多层硅模
S. Sugimoto, S. Tanaka, Jingfeng Li, R. Watanabe, M. Esashi
This paper describes a novel process, "Silicon Carbide Micro-reaction-sintering", to fabricate high-aspect-ratio silicon carbide microstructures. This process consists of micromachining of silicon molds, filling of material powders ( a-silicon carbide, graphite, silicon and phenol resin) into the molds, bonding of the molds with adhesive and reaction-sintering by hot isostatic pressing (HIP). Using our process, we have successfully fabricated silicon carbide microrotors of 5 and 10 mm diameters for micromachined gas turbines. We observed the cross section of the microrotors with a scanning electron microscope (SEM). The SEM observation demonstrated that the material powder was densely reaction-sintered by HIP. We also investigated the compositions of the microrotors by X-ray diffraction (XRD) analysis. The XRD analyses proved that graphite in the material powder reacted with melted silicon derived from the mold, and consequently /spl beta/-silicon carbide was produced around the /spl alpha/-silicon carbide originally included in the material powder.
本文介绍了一种制备高纵横比碳化硅微结构的新工艺——“碳化硅微反应烧结”。该工艺包括硅模具的微加工,将材料粉末(碳化硅,石墨,硅和酚树脂)填充到模具中,用粘合剂粘合模具并通过热等静压(HIP)反应烧结。利用我们的工艺,我们已经成功地为微机械燃气轮机制造了直径为5毫米和10毫米的碳化硅微转子。用扫描电镜观察了微转子的横截面。SEM观察表明,材料粉末经HIP反应烧结致密。并用x射线衍射(XRD)分析了微转子的组成。XRD分析证明,材料粉末中的石墨与模具中产生的熔融硅发生反应,在材料粉末中原含有的/spl α /-碳化硅周围生成了/spl β /-碳化硅。
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引用次数: 16
A monolithic fully-integrated vacuum-sealed CMOS pressure sensor 单片全集成真空密封CMOS压力传感器
A. Chavan, K. Wise
This paper presents an integrated multitransducer capacitive barometric pressure sensor that is vacuum-sealed at wafer level. The interface circuitry is integrated directly within the sealed reference cavity, making the device immune to parasitic environmental effects. The overall device process merges BiCMOS circuitry with a dissolved wafer transducer process, is compatible with bulk- and surface-micromachining, and employs chemical mechanical polishing (CMP), anodic bonding, and hermetic lead transfers. The sensor achieves 15b resolution and is suitable for low-cost packaging. The device is composed of a programmable switched capacitor readout circuit, five segmented-range pressure transducers, and a reference capacitor, all integrated on a 7.5/spl times/6.5 mm/sup 2/ die using 3 /spl mu/m features.
本文介绍了一种集成的多传感器电容式压力传感器,该传感器在晶圆级真空密封。接口电路直接集成在密封参考腔内,使器件免受寄生环境影响。整个器件工艺将BiCMOS电路与溶解晶圆换能器工艺相结合,兼容体微加工和表面微加工,并采用化学机械抛光(CMP),阳极键合和密封引线转移。该传感器达到15b分辨率,适合低成本封装。该器件由一个可编程开关电容读出电路、五个分段量程压力传感器和一个参考电容组成,所有这些都集成在一个7.5/spl倍/6.5 mm/sup /的芯片上,使用3 /spl mu/m的特性。
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引用次数: 89
Frequency response of TiNi shape memory alloy thin film micro-actuators TiNi形状记忆合金薄膜微执行器的频率响应
C.C. Ma, R. Wang, Q. Sun, Y. Zohar, M. Wong
Relatively independent of the physical dimensions of micro-actuators based on shape memory alloys (SMA), the reported frequency response typically is capped at a few tens of Hz. The slow response agrees well with that of the rotating micro-actuators fabricated in this work. On the other hand, based on heat transfer analyses, a theoretical response time of the order of a few milli-seconds should be possible for scaled microactuators, thus implying a frequency performance of at least a few hundred Hz. Therefore it is concluded that the response of SMA micro-actuators may not be limited by heat transfer, but by the slow rate of phase transformation between the austenitic and the martensitic phases. This is consistent with the slow phase growth rate of about 0.3 /spl mu/m/s observed using in-situ transmission electron microscopy.
相对独立于基于形状记忆合金(SMA)的微致动器的物理尺寸,报道的频率响应通常被限制在几十赫兹。这种慢响应与本研究制作的旋转微致动器的慢响应一致。另一方面,基于传热分析,理论上的响应时间为几毫秒,这意味着微执行器的频率性能至少为几百赫兹。因此,SMA微致动器的响应可能不受传热的限制,而是受奥氏体与马氏体相变速度缓慢的限制。这与原位透射电镜观察到的0.3 /spl mu/m/s的慢相生长速率一致。
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引用次数: 20
A micro-flight mechanism with rotational wings 带有旋转机翼的微型飞行机构
N. Miki, I. Shimoyama
A flight mechanism with 2 mm long micro-rotational wings has been designed and fabricated. The rotational wings are made of cobalt-nickel alloy and rotate in an alternating magnetic field. The flight mechanism is composed of the rotational wings, non-rotational body and disk. The wings and the disk are attached to glass rod and rotate together. As the rotating frequency increases, the wings and the disk move up and the disk pushes the body upwards, and then the whole structures take off. The characteristics of the rotational wings are investigated. A scale effect is found; the characteristics of the rotational wings get better as the wing length decreases. It is considered to be caused by the wing-longitudinal flow, which is often ignored in high Reynolds number flow. The non-rotational body has soft magnetic films. Due to the magnetic anisotropic torque exerted on the films, the body can maintain its attitude stability passively. The flight mechanism that weighs 1.6 mg succeeded in taking-off at 438 Hz keeping the attitude of the body stable. The magnetic torque between the external magnetic field and the wings must be larger than the torque from the air and the friction in order to keep the wings rotating. The relationship between the required magnetic field and the rotating frequency is investigated.
设计并制造了一种2 mm长微旋转翼的飞行机构。旋转翼由钴镍合金制成,在交变磁场中旋转。飞行机构由旋转翼、非旋转体和圆盘组成。机翼和圆盘固定在玻璃棒上,一起旋转。随着旋转频率的增加,机翼和圆盘向上移动,圆盘推动机体向上,然后整个结构起飞。对旋转翼的特性进行了研究。发现了规模效应;旋转翼的性能随翼长减小而变好。它被认为是由机翼纵向流动引起的,而这在高雷诺数流动中往往被忽略。非旋转体具有软磁膜。由于施加在薄膜上的磁各向异性转矩,机体可以被动地保持姿态稳定。重1.6毫克的飞行装置在438赫兹的频率下成功起飞,保持了身体的姿态稳定。为了保持机翼的旋转,外部磁场和机翼之间的磁扭矩必须大于空气和摩擦产生的扭矩。研究了所需磁场与旋转频率之间的关系。
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引用次数: 12
3-D microsystem packaging for interconnecting electrical, optical and mechanical microdevices to the external world 用于将电气、光学和机械微设备与外部世界互连的3-D微系统封装
A. Tixier, Y. Mita, S. Oshima, Jiang Guoy, H. Fujita
This paper reports the realization of a pigtailed silicon platform with 8 WDM filters based on a new 3-D packaging technology. Four silicon pieces are released out of a silicon wafer by using ICP-RIE as a very accurate dicing tool. One edge of the piece containing the filters is patterned into pin-shapes to be vertically inserted into a mother board with electrical connections. A V-groove board for the optical fibers is mechanically aligned in the mother board. This technology enables precise assembly of active optical devices with ribbon fibers, electrical connections to 3-D micromechanical subsystems and reconfiguring the system in the module level.
本文报道了一种基于新型三维封装技术的8个WDM滤波器尾纤硅平台的实现。通过使用ICP-RIE作为非常精确的切割工具,可以从硅片中释放出四片硅片。包含滤波器的片的一个边缘被图案成引脚形状,以便垂直插入具有电连接的母板。光纤槽板在母板内机械对准。该技术可以精确装配带有带状光纤的有源光学器件,与3-D微机械子系统进行电气连接,并在模块级别重新配置系统。
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引用次数: 8
期刊
Proceedings IEEE Thirteenth Annual International Conference on Micro Electro Mechanical Systems (Cat. No.00CH36308)
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