A PLL-dependent piezoelectric transducer frequency tracking technique based on static capacitance compensation 基于静态电容补偿的压电换能器锁相环频率跟踪
Methods A silver wafer with a basis resonance frequency 10 Mhz AT cut quartz crystal is used as the piezoelectric component; and the oscillation frequency shift of the quartz crystal during the blood coagulation is monitored. 方法采用AT切向、基频10MHz的银膜石英晶体作为压电元件;
Characteristics of piezoelectric loudspeakers in high frequency thermoacoustic refrigerator 高频热声制冷机中的压电喇叭特性
Study on the Behavior of the Piezoelectric Transducer around Its Parallel Resonant Frequency and Automatic Frequency Tracing 压电换能器在并联谐振频率附近的特性及自动频率跟踪的研究
The sim-SV wave in the piezoelectric cylinder has the standing wave phenomenon. The SH wave is independent of electric field, so the piezoelectric and non-piezoelectric cylinders have the same frequency dispersion curves about SH wave. 在压电圆柱中拟SV波存在驻波现象,圆柱中的SH波同电场无关,所以在压电圆柱和非压电圆柱中SH波具有相同的频散曲线。
This new piezoelectric material suitable for high frequency ceramic filters, ultrasonic transducers, metal flaw detectors and SAW de- 于是,这种新的压电材料适于制作高频陶瓷滤波器超声换能器,金属探伤检测器,以及声表面波器件等。
Considering piezoelectric coupling, the characteristic of frequency dispersion was investigated and the transient SH wave was obtained by means of the reverberation matrix-two dimensional spectrum method in the piezoelectric composite layered structure. 考虑压电耦合效应,通过传递矩阵-二维谱分析研究了压电复合材料层合板稳态SH波的频散特性和瞬态SH波的传播特性。
A Calculation of Dynamic Response of Piezoelectric Vibrator for High Frequency Calibration 校准用压电式高频振动台动力响应计算
A silicon micro cantilever structure with piezoeLectric thick film was designed for low frequency operations. 设计了一种硅微悬臂梁结构,在低频环境中以压电厚膜进行信号转换、谐振。
Much progress has been made in transducers, including cylindrical PVDF hydrophone, plane type PVDF hydrophone, cymbal transducer, relaxor-based piezoelectric single crystals transducer, and low frequency and high power small transducer. 介绍了PVDF圆柱型水听器、大面积平板PVDF水听器、钹式换能器、弛豫铁电单晶换能器、小体积低频大功率发射换能器等方面的研究进展。
Numerical examples are provided to show the effect of the geometry of the holes, the piezoelectric parameters of the materials and the frequency of the incident wave upon the dynamic stress concentration factor. 给出的数值结果表明孔洞几何位置变化,材料的压电参数变化,入射波的频率变化等都将影响材料的动应力集中系数。
The test results showed that when the chamber height was reduced enough, a piezoelectric pump could obtain a higher optimal frequency, and was able to prime itself. 实验结果表明,采用较小的腔体体积(腔体压缩比足够大)和复合阀结构,可使压电泵最佳工作频率增加,同时使压电泵具有较强的自吸能力和抗气泡干扰能力。
Development of multi-channel piezoelectric biochip frequency tester based on FPGA technology 基于FPGA的多通道压电生物芯片频率检测仪的研制
Piezoelectric Frequency Shift Method for Microdetermination of Copper in Human Hair 人发中微量铜的压电频移分析法
Effects of Development Technique of Piezoelectric Ceramics on Their Frequency Temperature Stability 压电陶瓷研制工艺对其频率温度稳定性的影响
Compared with conventional solid sintering process, the sol gel process exhibits advantages of decreasing sintering temperature, improving dielectric and piezoelectric properties, and increasing resonance frequency. SOLGEL工艺降低了材料的烧结温度,改善了材料的介电与压电性能,提高了谐振频率。
Influence factors of ultrasonic piezoelectric transducer echo wave frequency and the way of controlling 影响超声波换能器回波频率的因素及控制方法
METHODS A new dynamic piezoelectric ( frequency) response model and endpoint determination method for the piezoelectric coagulation were derived, based on the theoretic analysis of viscosity and density changes in coagulation reaction system. 方法理论分析凝血反应导致反应体系黏度密度变化规律,推导适合的频率动态响应模型并建立新的压电凝血终点判断法;
Furthermore, because the piezoelectric transformer was operated in resonant frequency, the high temperature stability of resonant frequency was necessary. 压电变压器是在谐振频率状态下工作,因此还需要较高的谐振频率温度稳定性。
Numerical examples were presented to show the effect of the geometry of the interacting cracks, the piezoelectric constants of the materials and the frequency of the incident waves upon the stress intensity factors. 通过数值计算,给出了裂纹的几何尺寸、压电材料常数、入射波频率等对于应力强度因子的影响。
The hydrogen sensor based on ultrasonic resonator uses the significant characteristics differences between the hydrogen and air, selects quartz as the piezoelectric material, uses two inverse piezoelectric effects to detect the resonant frequency of different concentrations of hydrogen. 利用氢气和空气之间在声学特征上的显著差异,以石英作为压电材料,并且采用双压电电极的工作方式,采用了正逆两种压电效应,检测出不同浓度氢气的谐振频率。
This paper focuses on the designing of piezoelectric generator at low frequency and high stress situations. 本文主要关注低频、大应力场合下的压电发电。
Experiments showed that only when the pair of piezoelectric transducers had the same resonant frequency and band width, the received waveforms are highly consistent under the same conditions. 试验表明,只有当配对使用的压电换能器具有相同的谐振频率和频带宽度时,在相同条件下接收到的波形才具有较高的一致性。
The piezoelectric Barrel-stave flextensional transducer is a low frequency sound generator that with compact structure, low-weight, be omnidirectional in the radial direction and is easily to be formed a line array. 凹筒弯张换能器具有结构紧凑、质量较小、工作频率低,且在圆周方向无指向性,外形易于成阵等优点。
The experiments of the piezoelectric vibrating film, the optimum working frequency of the micropump are studied. The close loop focusing system reaches the basic characteristics of the liquid tunable focal length lens with the accuracy control of the microfluidic volume. 研究压电陶瓷振动薄膜特性和微泵的最佳工作频率以及闭环调焦系统特性,实现了对微量液体体积的闭环精确控制,使该系统具备了可变焦液体镜头的基本特性。
The piezoelectric analysis was made to the high frequency lens style shock wave generator with ANSYS, which provides a theoretic basis for the design of the excitation power supply and the choice of the excitation frequency. 3. 利用ANSYS软件对频率较高的透镜式单元激波发生器进行了压电分析,对压电陶瓷激波发生器激励电源的设计和工作频率的选择具有指导意义。
Thickness-shear vibration of a quartz crystal plate is one of the most widely used functioning modes of piezoelectric resonators with broad applications for frequency control and detection. 石英晶体板的厚度剪切振动作为压电谐振器的主要工作模态在频率控制和传感器等领域都有着极为广泛的应用。
The tunable F-P filter is used as a wavelength selection device in the traditional wavelength demodulation equipment, and tunable F-P filter is commonly used mechanical structure of the piezoelectric ceramics, so scan frequency is only a few thousand Hz. 传统的波长解调设备采用可调谐F-P滤波器作为波长选择器件,而可调谐F-P滤波器一般采用压电陶瓷驱动的机械结构,因此扫描频率一般只有几千Hz。