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    Interpretation of the Experimental Phenomena about the P and S-Head Wave Phase Relations, and Its Significance to Full Wave Logging
    纵、横波首波相位关系实验现象的解释及其对全波测井的意义
    (2) deeper subsurface structure can be shown by using thermal wave phase signal than by using amplitude signal under the same modulating frequency, but the spatial resolution of detection by phase signal is inferior to that by amplitude signal, phase signal can't reflect subsurface structure whose transversal size is smaller than depth where the structure is located;
    (2)泵浦光的调制频率相同时,热波的相位信号比幅值信号可以反映更深的材料次表面结构,但热波相位信号的横向空间分辨率不及幅值信号的空间分辨率,相位信息不能分辨材料内部横向尺寸小于深度的次表面结构;
    A novel structure for integrated optical waveguide traveling wave phase modulator was presented. It makes use of the suspended slot line as the modulating circuit,and is capable of decreasing the mismatch between optical wave and modulating wave,so the bandwidth of the modulator can be greatly increased.
    提出一种新颖的集成光波导行波相位调制器结构,它利用悬置槽线作为调制器的外调制电路,减小了光波和调制波之间的速度失配,提高了相位调制器的调制带宽。
    According to the theory of the reversion of initial wave phase in ultrasonic testing of the depth of the cracks in concretes, the method for detecting cracks and estimating their depth with positive pulses was put forward.
    根据超声波检测混凝土裂缝深度时接收信号首波相位反转的原理 ,提出了用正波法检测及确定裂缝深度。
    Merits and demerits of contact-type measurement and non-contact-type measurement used in the measurement of 3D surface profile are briefly introduced. The principle of three non-contact-type measurement methods, including object optical grating method, sine wave phase modulation method and light bulb phase-shift interfering method, is laid special stress to discuss.
    简要介绍了用于三维表面轮廓测量的接触式和非接触式两种测量方法的优缺点 ,重点阐述了实体光栅法、正弦波相位调制法和白光相移干涉法三种非接触式测量方法的原理。
    The most important objective of desiging passive atomic frequency standard is to improve its ftrquency stability. This paper gives the formulas of computing Bn(m) correspond to sine wave phase modulation,square phase modulation and triangle wave phase,respectively.
    提高被动型原子频标的频率稳定度是原子频标设计中最重要的目标,文中分别详细推导了正弦波相位(频率)调制、方波相位(频率脉冲)调制、三角波相位(方波频率)调制时对频率稳定度有影响的Bn(m)值的计算公式;
    Thermo-acoustic engine with looped tube is a new traveling wave thermo-acoustic engine,which provides higher efficiency than standing wave thermo-acoustic due to traveling wave phase near the regenerator in the looped tube.
    带环形圈的热声发动机是一种新型的行波型热声发动机,由于能够在环形圈内回热器附近调制出行波相位,因此具有比驻波发动机更高的效率。
 

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