共查询到18条相似文献,搜索用时 375 毫秒
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一种新型压阻式硅微仿生矢量水听器的设计 总被引:3,自引:1,他引:2
介绍了一种新型的基于压阻效应的硅微仿生矢量水听器,详细叙述了该矢量水听器的结构设计方法,利用有限元软件ANSYS对矢量水听器结构进行了模态分析,采用振动台标定与低频校准装置测试相结合的方法对水听器进行测试,并给出了检测单元的加速度频响特性曲线和声压灵敏度曲线,以及矢量水听器在水下测试的接收灵敏度曲线和指向性图的测试结果.通过此实验方法,不仅验证了该矢量水听器设计的合理性,而且验证了它适用于低频检测,应用于水声探测具有一定的可行性.实验证明,该矢量水听器的接收灵敏度在500 Hz时达到-189.6 dB(0 dB=1 V/μPa),并具有良好的"8"字形的指向性. 相似文献
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介绍了一种新型的基于压阻效应的硅微仿生矢量水听器,详细叙述了该矢量水听器的结构设计方法,利用有限元软件ANSYS对矢量水听器结构进行了模态分析,采用振动台标定与低频校准装置测试相结合的方法对水听器进行测试,并给出了检测单元的加速度频响特性曲线和声压灵敏度曲线,以及矢量水听器在水下测试的接收灵敏度曲线和指向性图的测试结果。通过此实验方法,不仅验证了该矢量水听器设计的合理性,而且验证了它适用于低频检测,应用于水声探测具有一定的可行性。实验证明,该矢量水听器的接收灵敏度在500Hz时达到-189.6dB(0dB=1V/μPa),并具有良好的“8”字形的指向性。 相似文献
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对一种以方形硅膜片作为一次敏感元件;硅梁作为二次敏感元件的硅谐振式压力微传感器进行了研究:建立了微传感器敏感结构的数学模型;敏感结构参数:方形膜边长4 mm,膜厚0.1 mm,梁谐振子长1.3 mm,宽0.08 mm,厚0.007 mm;对原理实验样件采用电热激励、压阻拾振方式作了开环测试,讨论了传感器的闭环系统. 相似文献
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一种MEMS同振柱型仿生矢量水听器的研制 总被引:1,自引:0,他引:1
提出了一种结合MEMS技术、仿生原理和压阻原理的同振柱型矢量水听器,即由二维仿生水听器和声压水听器组合而成的柱体。在声学理论基础上详细介绍了该水听器的封装设计及制作过程,在国防水声一级计量站对该矢量水听器进行校准实验,实验结果表明:该同振型矢量水听器的工作频带范围为0~3 kHz;X通道灵敏度-177.9 dB(2 kHz),Y通道灵敏度-175.4 dB(2 kHz),声压通道灵敏度-175.8 dB(2 kHz);具有很好的"8"字指向性;可承受3 MPa压力。此新型MEMS同振矢量水听器适用于民用船只避障,渔业捕捞,海洋勘探等领域。 相似文献
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一种基于ARM的仿生偏振光测试系统的研究 总被引:2,自引:0,他引:2
针对研制仿生导航微纳传感器的需要,设计了一种以光电二极管为光电转换元件、以ARM微处理器为控制核心的仿生偏振光测试系统.分析了仿生偏振光测试的原理,并对测试系统的硬件设计及基于实时操作系统uC/OS-Ⅱ的软件开发进行了详细的阐述.该测试系统成功实现了对特定波段(370 nm-520 nm)的偏振光信号的采集,并利用三路信号进行了定位角度的计算. 相似文献
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Linggang Guan Chenyang Xue Guojun Zhang Wendong Zhang Panpan Wang 《Microsystem Technologies》2011,17(3):459-467
This paper reports on recent developments to improve the performance of hair vector hydrophone by means of several technological
advancements in the fabrication procedures and corresponding sensor design. With fish’s lateral line organs as prototypes,
NEMS (Nano-Electromechanical System) vector hydrophone with directivity has been designed. This paper describes the meso-piezoresistance
effect of resonant tunneling thin-film, and the NEMS hydrophone based on this effect is highly sensitive and small size. The
application of bionics structure may improve the low-frequency sensitivity of hydrophone. The calibration test shows that
NEMS vector hydrophone’s receiving sensitivity is up to −170 dB (0dB = 1 V/μPa), has a good directional pattern in the form
of “8” shape. The sea test shows that the direction of target can be detected by single NEMS vector hydrophone. In the anechoic
tank, it has been verified that NEMS vector hydrophone can track the trajectory of the moving target. 相似文献
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将匹配场原理应用到单矢量水听器上,实现对目标声源的被动定位。对常用的2种Bartlett处理器进行仿真分析,提出了一种改进的Bartlett处理器,可以抑制旁瓣个数并提高主瓣强度。通过试验数据分析,在1.3 km的范围内,接收信噪比不低于10 dB时,测距和测向误差可以控制在10%以内。该研究为单矢量水听器的实际应用提供了重要的参考依据。 相似文献
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矢量水听器技术目前已被广泛应用于目标到达方位估计领域。因其具有与频率无关的指向性特点,即使利用单个矢量水听器也可以测定低至几十赫兹的低频目标方位,而标量水听器在低频的到达方位估计则需要巨大孔径的阵列才能完成上述测量功能。针对矢量水听器这一优点,对低频(100~300 Hz)声信号的方位估计性能进行了海上试验研究,并结合罗经同步测得的平台方位数据,给出了目标在大地坐标系下的绝对方位。海上试验结果表明:矢量水听器低频方位估计结果与GPS测量结果一致,在3.6km距离范围内,到达方位估计标准差不超过5°。 相似文献
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Binzhen Zhang Hui Qiao Shang Chen Jun Liu Wendong Zhang Jijun Xiong Chenyang Xue Guojun Zhang 《Microsystem Technologies》2008,14(6):821-828
In the paper, a micromachined artificial vector hydrophone arises from a biological inspiration, the fish hair cell is presented.
It is desirable that the application of piezoresistive effects combined with ingenious bionic structure and MEMS technology
may improve the low-frequency sensitivity of the vector hydrophone as well as its miniaturization. Modeling processes for
realizing the artificial hair cell hydrophone, along with preliminary characterization results in terms of sensitivity, frequency
response and directivity patterns are also introduced. The microstructure of the sensor consists of four vertical cantilever
beams with attached rigid plastic cylinder in the center of the structure. By locating eight piezoresistors logically formed
the Wheatstone bridges; they can detect two components of underwater acoustic signal simultaneously. The prepared vector hydrophone
has been measured in the standing wave field finally. The experiment results show that the vector hydrophone has good low-frequency
characteristic, the free-field voltage sensitivity is −197.2 dB (0 dB = 1 V/μPa) at 400 Hz with a about 2 dB one-third octave
positive slope over the 40–400 Hz bandwidth. The depth of pits of the directivity pattern is about 34.6 dB. 相似文献