1) capacitive weighted transducer
电容加权叉指换能器
2) withdrawal weighting transducer
抽指加权叉指换能器
1.
A new method to design source-withdrawal weighting transducer is presented,which avoids the complexity when using traditional design methods.
提出了极性抽指加权叉指换能器设计的新方法,克服了传统设计方法的繁杂性。
2.
In order to avoid complexity for designing electrode withdrawal weighting transducer, a new method for designing electrode withdrawal weighting transducer is adopted.
为克服传统方法设计抽指加权叉指换能器的繁杂性,提出了一种全新的抽指加权叉指换能器的设计方法,它模仿生物进化规律,将所设计的抽指加权叉指换能器进行二进制编码,并根据任意给定的目标频率响应曲线和抽指加权叉指换能器的频响特性构造适应度函数,同时考虑抽指加权叉指换能器的指条抽取后的邻近效应,通过排序选择、一点交叉和变异等遗传操作,自动进化出符合任意给定频率响应特性的抽指加权换能器。
3) CIDT
电容式叉指换能器
1.
A Capactive Interdigital Transducer(CIDT) was used in capacitive Lamb wave device to solve the problem that the processes of function layers in most Lamb wave devices were incompatible with classical IC process.
提出了激励和接收均使用电容式叉指换能器(Capacitive Interdigital Transducers,CIDT)的集成化的电容式Lamb波器件。
4) interdigital transducer
叉指换能器
1.
New Equivalent Circuit Model of Interdigital Transducer and Its PSPICE Simulation;
叉指换能器新的等效电路模型及其PSPICE仿真
2.
To solve these problems, the properties of Lamb wave excited by interdigital transducer in the piezoelectric substrate covered by liquid were studied based on its piezoelectricity and anisotropy.
在考虑晶体的压电性和各向异性基础上 ,从声的波动理论出发 ,对叉指换能器在液体 -压电晶片界面上兰姆波的激发理论及其性质进行了研究 。
3.
There is the excitation of bulk acoustic waves inside the substrate besides the excitation of surface acoustic waves along the substrate surface when interdigital transducer is powered by the electrical signal with one frequency.
文章对叉指换能器在不同切型基片内激励声体波的角谱（能量分布）进行了研究，所得结果在研制声学传感器、声表面波器件时具有重要意义。
5) IDT
叉指换能器
1.
The Making Technology of IDT;
声表面波器件叉指换能器的制作技术
2.
When SAW is excited by the IDTs on the substrate,and BAW is excited as well Based on this principle,experiments to suppress BAW have been done by grooving on the back of the substrates such as ST,LT,LN with the filter center frequency of 28 MHz,70 MHz,71 MHz,120 MHz respectively The BAW suppression is observed and the experimental results are also given in this pape
当叉指换能器在基片上激励声表面波模式时 ,同时伴随着体声波的激励。
3.
The design and fabrication of acoustical waveguide and interdigital transducer (IDT) in the quasi-collinear acousto-optic tunable filter (AOTF) was investigated experimentally by using SiO2/In2O3 film on LiNbO3 substrate.
以LiNbO3晶体为基底,SiO2/In2O3为镀膜材料,设计并制作了用于准共线型声光可调谐滤波器(AOTF)的声波导及其叉指换能器(IDT),研究了制作工艺,实验测量了该声波导的传输性能。
6) Interdigital transducers
叉指换能器
1.
A method to simulate surface acoustic wave device(SAWD) is proposed,in which impedances of Mason equivalent circuits are equaled by LC networks called as subcircuit,and piezoelectric material between input and output interdigital transducers are equaled by non-loss transmission line with the same delay time.
提出了采用PSPICE仿真声表面波器件的方法,它将叉指换能器一个周期段Mason等效电路复阻抗采用LC串并联网络等效,并以子电路形式由叉指换能器等效电路调用,两换能器间声传播路径采用等延迟时间的无损耗传输线等效,同时考虑外电路影响,仿真得到的异型声表面波器件的幅度特性与实测结果基本相符。
2.
The excitation of bulk acoustic waves(BAWs) by interdigital transducers(IDTs)is thoroughly studied in the structure consisting of piezoelectric crystal solid layer liquid.
对压电晶体 -固体 (层 ) -液体结构中叉指换能器的体声波激励效应进行了深入探讨 ,通过引入压电晶体-固体层界面的界面有效介电常数 ,研究了叉指换能器的体声波激励效应与晶体切向、电边界条件及固体层归一化厚度之间的关系。
补充资料：电容换相换流器
电容换相换流器
capacitor commutated converters, CCC
d一onrong huonx一ong huonlluq{电容换相换流器(eapacitor。ommutatedeonverters，CCC)在常规换流器的交流侧申人电容器构成换相电路的换流器。电容器一般申接在换流桥和换流变压器之间(如图1所示)。电容换相换流器可以减少换流器的无功消耗，且无功消耗基本不随直流输送有功的变化而变化，减少了换流站无功补偿设备和相应的投切开关;可以显著提高交直流系统运行的稳定性，增加抗扰动能力，减少换相失败的机率，对于连接弱交流系统其作用更加明显，还可以抑制换流阀的短路电流。由于电容参加换相，使阀尖峰电压和谐波有所增加。┌──┬──┐│5 12│凡32│├──┤ ││ │ │├──┼──┤│542 │562 │└──┴──┘ 图1电容换相换流器原理图 无功平衡在常规换流器中，换流器消耗的无功随直流输送有功的变化而变化。当直流输送额定功率时，换流器无功的消耗近似于输送有功的一半。这需要安装相应的无功补偿设备并通过不断投切无功补偿分组来保持换流母线的电压水平以及与交流系统的无功交换量，见图2(a)。无功补偿装置投切时，对交流系统产生扰动;当直流系统因故障停运时，会在换流站交流母线上产生较高的暂时过电压。 口‘p、呈之!一丝塑生乙限流器不平衡t ()叨川，) 瓜、亏:乍 ()图2人犯《P .uj滤波器为印.u》常规换流器和电容换相换流器的无功消耗(a)常规换流界，(b)电容换相换流器采用电容换相换流器后，换流站无功补偿容t可降至小于输送有功功率的15%，并且当直流抽送功率发生变化时，换流器消耗的无功变化缓慢，不偏要安装随有功变化而投切的无功补偿装皿，见图2(b).通过适当选择申联电容的容量，可以使所需的无功由几组高性能、低容量的交流滤波器来补偿，如采用连续可调交流滤波器(见换流站连续可调交流滤波装里). 动态德定性能电容换相换流器可以明显改善直流输电的动态稳定性能.电容器的申人直接影响了换相电压，使逆变侧的定关断角运行特性成为正斜率直线。而常规换流器的运行特性为负斜率直线，它和整流侧最小口角特性的交点不是一个稳定运行点(见直流堵电系统运行特性)。而电容换相换流器不存在不稳定工作点，特别是当逆变侧为弱交流系统时，其稳定性显著优于常规换流器。 在电容换相换流器中，除了交流母线电压以外，电容器提供了一个附加的换相电压。
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参考词条