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横向相干
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  transverse coherence
     The methods of measuring the coherent parameters are discussed which include temporal coherence function, coherence length, the degree of coherence, the global degree of coherence and the average transverse coherence length .
     最后,对相干参数的测量方法进行了讨论和设计。 可测量的相干参数为光束的时间相干函数、相干长度、相干度的绝对值、平均相干度以及平均横向相干长度。
短句来源
     The OCT system behaves just like a linear shift invariance system with complex amplitude. The transverse coherence transfer function (CTF) is characterized by lowpass while the longitudinal CTF, by bandpass. So the transverse image measured represents the low spectra information of the internal transverse structure of a sample and the longitudinal image represents the high spectra information of the internal longitudinal structure.
     在弱物体近似下分析了OCT系统图像形成机理.研究表明,OCT系统相当于一复振幅线性平移不变系统,其横向相干传递函数具有低通特性,纵向相干传递函数具有带通特性.因此,系统测量的横向图像反映了样品内部横向结构的低频信息,纵深图像为内部纵深结构的高频信息.
短句来源
  “横向相干”译为未确定词的双语例句
     THEORY OF HORIZONTAL COHERENCE OF SIGNAL FIELD IN SHALLOW-WATER
     随机浅海信道中信号场横向相干理论
短句来源
     Calculation for the Transverse Coherent Length in Atmospheric Turbulence
     大气湍流横向相干长度的计算
短句来源
     This paper numerically calculates the transverse coherent length in atmospheric turbulence in the horizontal and vertical direction by its formula of integration and computer.
     本文利用大气湍流横向场相干长度积分公式,借助计算机进行数据模拟分别计算了在水平方向和垂直方向的大气湍流横向相干长度。
短句来源
     After lateral low frequency noises are removed by high pass filtering,mid-value filtering works better.
     采用高通滤波消除横向相干的低频干扰后,中值滤波的效果会更好。
短句来源
     The analysis shows that the transverse coherent length decreases by increasing range,and in the horizontal direction it is lcss than in the vertical direction in the same range.
     分析表明:大气湍流横向相干长度随测距的增大而变小;
短句来源
  相似匹配句对
     Calculation for the Transverse Coherent Length in Atmospheric Turbulence
     大气湍流横向相干长度的计算
短句来源
     / A NEW APPROACH OF FINER COHERENT SCANNING SUITABLE FOR LATERAL EXTRAPOLATION/
     一种适用于横向外推的精细相干扫描方法
短句来源
     THE PHYSICAL MEANING OF COHERENT LENGTH
     相干长度的物理意义
短句来源
     Odd-even Coherent State of q-
     q——奇偶相干
短句来源
     Suppression of transverse stimulated Brillouin scattering
     横向受激布里渊散射的抑制
短句来源
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  transverse coherence
In this case the contrast of the interference pattern is determined by the transverse coherence length which is orders of magnitudes larger than the longitudinal coherence length.
      
At saturation the FEL emits short pulses with GW peak power and a high degree of transverse coherence.
      
A one dimensional, time dependent simulation of harmonic generation in a gas cell, taking into account experimentally measured transverse coherence of the laser, closely reproduces the observed behaviours.
      
High sensitivity of this interference phenomena may be used to measure transverse coherence length of the beam.
      
Transition radiation from a micro-focused electron beam traversing a foil stack served as X-ray source with good transverse coherence.
      
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The horizontal random perturbation on a qudsi-plane wave field in a random channel was treated as a stationary Gaussian process. The degradation of horizontal coherence in shallow water homogeneous layer due to the influences of micro-structure of water masses and random boundary was calculated for field region of "three-half":here k0 is wave number ; μ2 and a are parameters of micro-structure, O_H~2 is the standard deviation of the fluctuated boundary, Bo is the average water depth, r is the transmission range...

The horizontal random perturbation on a qudsi-plane wave field in a random channel was treated as a stationary Gaussian process. The degradation of horizontal coherence in shallow water homogeneous layer due to the influences of micro-structure of water masses and random boundary was calculated for field region of "three-half":here k0 is wave number ; μ2 and a are parameters of micro-structure, O_H~2 is the standard deviation of the fluctuated boundary, Bo is the average water depth, r is the transmission range and Q is the parameter of bottom loss.

本文将准平面波在随机信道中受到的横向随机扰动考虑为平稳高斯过程,分析计算了均匀浅海信道中由温度微结构及随机起伏界面所引起的信号场横向相干性减弱的情况.在实际感兴趣的“3/2次方”场区,给出大横向距离的相关系数为其中k_0为波数,μ~2,a为水团参数,σ_H~2为随机界面的起伏方差,Ω为海底反射损失随掠角变化的平均斜率,H_0为平均海深,r为传播距离.

In this paper, an experimental and theoretical investigation on finite-amplitude reflection sound wave of circular piston sources is presented. The reflected field of harmonic waves from the boundary surface have been calculated. Thinking of them as the waves which radiate from the image of the piston source and treating them as the waves that seem to be generated by a new source on the vibrating boundary surface, by means of weak-shock theory, the reflection of the finite-amplitude waves can be predicated.

本文研究了圆形活塞声源的有限振幅声波的反射。应用像源法计算已产生的谐波本身在边界上的反射,将它们看成是反射边界上振动的新声源所产生的辐射场,再应用弱冲击理论来计算这部分场自己产生的谐波场。 在水池中作了二阶谐波的反射实验,反射界面是水池壁。结果表明,谐波声压随距离的平均衰减规律与理论符合得很好。实验还表明,反射谐波场沿纵向距离以及与它相垂直的横断面上有强烈的干涉现象,而纵向相干长度比横向相干长度大一个数量级。通过理论估计,认为这种现象是由于反射壁的有限厚度、它的两个平面之间有一个很小的角度以及发射波束有一定的宽度所造成的。这样估算出来的两个相干长度与实验符合。

Yu Shoupeng, Cai Xiling and Su Yongchang: Improvement of signalto-noise ratio of stack section using polynomial fitting of seismic signals, OGP, 23(2) 1988: 131~139 Signal-to-noise ratio of seismic data can be raised using lateral coherency of signals. we advanced a method for enhancing the seismic signals of stack section by making polynomial fitting of signals. Signal parameters can be represented by phase time, amplitude and common waveform on the assumption that a seismic signal has same waveforms on all...

Yu Shoupeng, Cai Xiling and Su Yongchang: Improvement of signalto-noise ratio of stack section using polynomial fitting of seismic signals, OGP, 23(2) 1988: 131~139 Signal-to-noise ratio of seismic data can be raised using lateral coherency of signals. we advanced a method for enhancing the seismic signals of stack section by making polynomial fitting of signals. Signal parameters can be represented by phase time, amplitude and common waveform on the assumption that a seismic signal has same waveforms on all traces. This method includes the following steps: 1. Obtain time polynomial of signal using cross correlation in a time-space window,the polynomial determining the phase times of signal on all traces; 2. Determine both signal amplitude polynomial in the window and expected signal waveform using least square method; Note: Same computation for each window is made to get a parameter set for the signal section, there being both coefficients of two polynomials and an expected waveform for each window. 3. Synthesize a signal section using the parameter set derived. This method is approximate to trace summation; however, it can detect signals automatically and is not limited by the slope and curvature of reflection leg. It was applied to real seismic stack section, and obvious effect was found.This method also can be used in trace-interpolation of 2D or 3D seismic data.

俞寿朋,蔡希玲,苏永昌:用地震信号多项式拟合提高叠加剖面信噪比,《石油地球物理勘探》,23(2)1988:131~139 利用信号横向相干性可以提高地震数据的信噪比。我们提出了一种在叠加剖面上对信号做多项式拟合来加强信号的方法。假设一个信号各道波形相同,那么信号的参数就可用其相位时间、振幅和公共波形来表示。此法的第一步是在信号时-空窗内用多道互相关确定信号时间多项式,此多项式决定了各道的信号相位时间;第二步用最小二乘法确定此窗口的信号振幅多项式,同时确定信号的期望波形,并对每个窗口重复以上计算,就可获得信号剖面的参数集,即每个窗口有两个多项式的系数和一个期望波形;最后一步是用获得的参数集合成信号剖面。此法大致相当于道组合,但它能自动检测信号,并且不受同相轴斜率和曲率的限制。此法已用于实际地震叠加剖面,见到了明显的效果。此法也可用于二维和三维的道内插。

 
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