1)pulse spreading脉宽展宽
1.In order to meet the demand of the developing femtosecond laser techniques and integrated optics, to resolve the problems of group velocity mismatching, pulse spreading etc in the β-BaB2O4 (β-BBO) single crystals which caused by the thickness, the preparation techniques of β-BBO films have been studied.为了满足飞秒超快激光技术和集成光学发展的需要、解决βBaB2O4(βBBO)体单晶中因厚度带来的群速度失配问题以及脉宽展宽等问题,人们开始了βBBO薄膜的制备技术研究。
英文短句/例句
1.Because of the phase-sensitive nature of PSA's gain, fiber dispersion will also cause soliton pulse amplitude descending and its width broadening.由于PSA增益的相敏特性,光纤色散导致孤子脉冲主瓣幅度下降,脉宽展宽,出现旁瓣。
2.Investigation of Pulse Stretching in Electro-Optical Q-switched Ruby Laser;电光调Q红宝石激光脉冲展宽的研究
3.50 fs Pulse Generation from All-Fiber Stretched-Pulse Laser50 fs输出的全光纤展宽脉冲激光器
4.impulse bandwidth脉冲(频)带宽(度)
5.Research of Key Technology about Compression and Stretch of Ultroshort Pulses;超短激光脉冲压缩与展宽的关键技术研究
6.Investigation of Reconvergence Induced SET Pulse Broadening in Combinational Benchmark Circuits基准电路中重汇聚导致的SET脉冲展宽效应
7.Evolution Rule of Ultra-short Laser Pulse Area in Homogeneously Broadened Medium均匀展宽介质中激光超短脉冲面积的演化规律
8.The research of pulse stretch in free-space optical communication自由空间光通信系统中光脉冲展宽问题的研究
9.An Efficient Method for Simulating Time-Domain Broadening of Laser Pulse Propagating Underwater一种激光脉冲水下传输时域展宽模拟计算方法
10.binary digit duratio二进制数字脉冲宽度
11.PWMI (Pulse Width Modulated Inverter)脉冲宽度调制变换器
12.AM transmitter with pulse duration modulation脉宽调制式调幅发射机
13.trigger gate width multivibrator触发脉宽多谐振荡器
14.asymmetrical P.D. modulation不对称脉冲宽度调制
15.pulse width modulated A/D converter脉宽调制模数转换器
16.capstan PWM generator主导轴脉宽调制发生器
17.Spectrum Broadening and Pulse Compression of Ultrashort Optical Pulses in Cascaded Hollow Fibers;超短光脉冲在分段中空光波导中的光谱展宽和脉冲压缩
18.Design of PWM in Pulse-width Speed Regulating System Controlled with Single Chip Microcomputer单片机控制脉宽调速系统中脉宽调制器的设计
相关短句/例句
Pulse-expanding脉冲展宽
1.The Application of Pulse-expanding Circuit Based on the FPGA;FPGA在脉冲展宽电路设计中的应用
2.The designing and implementation of monostable pulse-expanding circuit based on FPGA device;基于FPGA的单稳态脉冲展宽电路的设计与实现
3)pulse expanding脉冲展宽
1.Manufacture of chromatic dispersion impulse expanding analytic device in optical fiber;光纤色散脉冲展宽分析仪的研制
2.The basic theory of chromatic dispersion in optical fibers is discussed and the pulse expanding is analyzed on emphasis.针对光纤色散特性会引起传输信号的畸变,限制通信容量,指出对光纤色散参数、光信号在长距离传输后脉冲展宽程度的准确测量,可以提供可靠的设计数据来源,在实际的工程应用中有着重要意义。
4)pulse stretching脉冲展宽
1.Identifing target with pulse stretching characteristic;利用脉冲展宽特性识别云和地面目标
2.The temporal variation of the inversion density,the cavity loss(including laser output) and the photon density were analyzed by theoretical calculation in a electro-optical Qswitched ruby laser,and then the conditions of laser pulse stretching were calculated.从理论分析了电光Q开关红宝石激光的反转粒子数密度、腔损耗(含激光输出)与光子密度之间瞬态变化关系,导出了脉冲展宽条件。
5)pulse broadening脉冲展宽
1.Effect on pulse broadening due to first-order polarization mode dispersion compensation;偏振模色散补偿对脉冲展宽的影响
2.The experiment results prove that the pulse broadening for an optical pulse propagating along several hundreds meters optical fibers contained single mode or multi-mode during propagation is allowed.实验结果表明,所选的多模和单模光纤经数百米传输后的脉冲展宽在容许误差范围之内,说明所选用的光纤可以作为纳秒激光时间脉冲波形测试的理想传输介质。
3.Propagation induced pulse broadening of single event transient is studied by SPICE simulation.利用SPICE电路模拟研究了SET在传播过程中的脉冲展宽效应。
6)pulse width expanded脉冲展宽
1.Function of “pulse width expanded of multi-mode optical fiber” for bachelor thesis in process of practice teaching;本科生毕业设计“多模光纤脉冲展宽”在实践教学中的作用
延伸阅读
交流脉宽调制变频调速交流脉宽调制变频调速AC motor speed control by PWM frequency converter J一001旧mo一kuon tjooZh一b旧nPlnt旧osu交流脉宽调制变频调速(Ae motor speedeontrol by PWM frequeuey eonverter)在交流一直流一交流变频调速系统中，采用脉冲宽度调制(Pulse Width Modulation，PWM)实现交流电动机调速的技术。交流电动机的极对数一定时，其同步转速与供电电源频率成正比，改变供电电源频率就能调节交流电动机的转速(见变频调速)。脉冲宽度调制(简称脉宽调制)技术是1969年德国的A·舍龙(A·Schonung)等把通信系统中的调制技术应用于交流电动机调速中提出的，70年代后期得到了发展，80年代利用这种技术的调速控制已进人实用阶段。采用脉宽调制控制技术，是将载频信号与参考电压信号进行比较，发出调制信号控制变频器开关元件的通、断，使其输出端获得矩形脉冲波形，通过改变载频信号或参考电压信号的频率和幅值，可改变输出脉冲的宽度或幅度及频率，随之改变基波输出电压和频率，即改变交流电动机供电电源的电压和频率，实现交流电动机的速度调节。 PWM型变频器利用脉宽调制控制技术控制的变频器称PWM型变频器。对于一般的工业应用，PWM型变频器的整流器部分由二极管桥式整流器和LC滤波器构成，基波频率的输出电压是在逆变器内部以多脉冲脉宽调制方法进行控制的。脉宽调制方法有多种，为使输出电压接近正弦波形，多用正弦波脉宽调制方法。从控制方式上分为单极式和双极式两种。 (1)单极式正弦波脉宽调制。如图1(a)所示，图中分别为载频信号uc、参考电压信号ur的波形图和三相翰出电压中的a相电压姚的波形图。载频信号为单极式等腰三角形波，参考电压信号则为单极式正弦半波串，三相逆变器中的参考电压信号应互差1200。输出电压的大小和频率都由参考电压信号控制。当改变“r的大小时，输出电压的大小随之改变;当改变u，的频率时，输出电压的频率随之改变。其输出波形接近于正弦波形，称单极式正弦波脉宽调制。
