您要查找的是不是：
- The recent advances in ultrasonic guided wave testing technique are summarized. 摘要综述近年来超声导波检测研究的最新进展。
- When the square wave signal pass the LPF,we can get the sine signal. 经过分析可知,检测过程中的低通滤波器对检测的精度和速度有重要影响。
- Guided wave second-harmonic (SH) generation can not be phase matched automatically by Cerenkov radiation scheme. 用波导产生倍频波时,如果倍频波进入辐射模区,仍然有相匹配问题。
- Based on the ultrasonic guided wave technique and the dispersive waveform prediction method, a method about how to image defects in pipes is presented. 摘要在导波传播理论和频散波形预测理论的基础上，研究了超声导波在检测管道时，如何利用时域波形重构缺陷图像的问题。
- A newly developed auto-monitor system for the long wave signal(BPL) is introduced. 介绍了新研制的长波信号 (呼号BPL)自动监视系统。
- The transmitter generates guided wave in the plate according to magnetostrictive effect,and then it propagates in the plate and is reflected by the damages and edges of the plate. 根据反射信号的到达时间和波在板中传播的速度,可判断出板中缺陷所在位置。改变恒定偏置磁场与时变磁场的方向可以在板中激励不同波型的导波。
- The dynamic error is inevitable because the bandwidth of measurement system cannot cover completely the efficient bandwidth of the blast wave signal. 由于测试系统的带宽不能完全覆盖冲击波信号的有效带宽,存在不可忽视的动态误差。
- USB mouth, digital double channel and electric potential collector, brain wave signal is put into the computer after digital processing. USB接口全数字化双通道脑电采集器，将脑电信号数字化处理后输入计算机；
- Curve the films into rectangle waveguide with BCl3 ions. Detect the gain 10.0dB at the 10uW square wave signal and pump power 160mW. Get 4.2dB gain per centimeter. 用BCl_3干法刻蚀将镱铒共掺Al_2O_3薄膜刻蚀成光波导，当信号光被调制为1Hz的方波时，在160mW功率泵浦下，光波导放大器的总增益为10.;0dB，单位长度增益为4
- Applying classical wave theory, a concept of equivalent elastic modulus on propagation speed modification of guided wave through "variable cross-section" of metal bar embeded layer was put forward. 摘要运用波动的经典理论，提出了导波在金属杆嵌入层“变截面”传播时波速改变的“等效弹性模量”的概念。
- Synchronous monitoring system can record and recurring the monitoring image and brain wave signal synchronously, and monitor the cooperation of the testee. 同步监控系统，将监控图像和脑电信号同步记录和回放。能够监控被测试对象的配合程度；
- ZHANG Yun-cai.Dual flap making wave system and parameterless analysis of wave signal spectrum [J].Journal of Shanghai JiaotongUniversity, 1996,30(10):141- 146. [4]张云彩.;双摇板造波机系统及波浪信号谱无参分析[J]
- Guided wave inspection is very attractive in this application as it is particularly sensitive to transverse vertical defects since the waves travel along the length of a rail. 由于波沿着轨道长度方向传播，在横向/垂直向不合格品检验中非常灵敏，所以导向波检验在这方面是非常有吸引力的。
- Due to the dispersive and multi-mode characteristics of guided waves,the pulse of energy will spread out in space and time as it propagates. 在分析超声导波时间-空间传播特性基础上,建立了超声导波检测的空间表述模型。
- Our theoretical analysis produces the dispersion curves of longitudinal modes of ultrasonic guided waves in liquid-filled pipes with viscoelastic coatings. 理论分析得到了带粘弹性包覆层充液管道中纵向模态的频散曲线。
- AGC(automatic gain control) is used, namely, peak voltage of back wave signal after sampled is input to microprocessor, then A/D converter, D/A converter, gain control adjusting circuit to realize back wave signal AGC. 采用自动增益控制,即回波信号的峰值电压经过采样后进入单片机进行 A/D 转换,再经过 D/A 转换和增益控制电路,形成回波增益的自动控制;
- This paper specifies the composition and principle of the circuit of the rectangle wave signal generator based on 89C51 single chip microprocessor control and BCD rate multiplier synthesis. 介绍一种由89C51单片机控制、BCD系数乘法器4527数字合成的方波信号发生器及其电路组成和工作原理.
- In this paper, we present the basic principle of dual flap wave-maker and the producing of driving signal firstly, and then the influence of two distinct FFT methods with the same wave signal to the primary parameters of wave spectrum. 摘要叙述了采用双摇板造波系统的基本思想及双摇板造波信号的生成，并分析了同一波浪信号用不同谱分析法对所得主要谱参数的影响。
- Defect Pipe Imaging Based on Guided Wave Technique 基于导波理论的管道缺陷成像研究
- Work out high-efficient procedure and realize fast regulation of phase and amplitude of sinusoidal wave signal by utilizing high operation characteristic of 80C196MC and advantage of the wave form generator(WFG) in this paper. 本文还利用80C196MC运算速度快的特点及波形发生器(WFG)的优点，编制了高效的程序，实现快速地对正弦波信号的相位和电压幅值进行调节。
