共查询到18条相似文献,搜索用时 140 毫秒
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实验研究了基于AlAs/InxGa1-xAs/GaAs共振隧穿二极管(RTE)的振荡器的压力-频率转换特性,实验结果表明:该特性具有良好的线性特征,且其线性灵敏度达到0.84 kHz/MPa.利用此压力-频率转换特性,首次设计并利用微机械控制孔技术加工制作了基于RTD的GaAs基悬臂式声传感器结构,实现了RTD与GaAs基微机械加工技术的工艺集成. 相似文献
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介绍一种压电加速度计在新型水声接收换能器———同振型矢量水听器设计中的应用方法。叙述了采用压电加速度计设计同振型矢量水听器的理论依据,并给出根据此方法设计制作的同振型矢量水听器的自由场开路电压灵敏度和指向性图测试结果:自由场电压灵敏度为-190~-200dB(0dB=1V/μPa,测试频率1000Hz),指向性图分辨力kd>20dB。 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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Research on double-barrier resonant tunneling effect based stress measurement methods 总被引:2,自引:0,他引:2
Piezoresistive effect of semiconductor materials is often used in microsensors as a sensing principle. Resonant tunneling diodes (RTDs) have been proved to have negative differential resistance effect, and their current–voltage characteristics change as a function of stress, which can be generated by external mechanical loads, such as pressures, accelerations and so on. According to this, the Meso-piezoresistive effect of RTDs can be used for stress measurement. This paper discusses two double-barrier resonant tunneling effect based stress measurement methods, including an RTD-Wheatstone bridge based method originally proposed. According to the results from the RTD-Wheatstone bridge based experiment, the piezoresistive sensitivity of RTD is adjustable in a range of 3 orders. And the largest piezoresistive sensitivity of RTD is larger than that of common semiconductor materials, such as silicon and GaAs. 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