相移

Calculating formula of wave impedance is obtained by main values of the inverse tangent function of phase_shift at two neighboring frequencies and the corresponding integral character of phase_shift is denoted as the convergent criterion of wave impedance inversion.

利用复合反射系数中多个频率点的相移反正切函数主值，给出了波阻抗的计算公式，并把套管-地层环空间介质中波的相移的整、实特性作为波阻抗反演收敛的判据。

We expect it will benefit the industry field to break through the optical measuring limits at present by offering some new ideas. Optical measuring research based on moire interferometry has developed for several decades. The main idea of this research is to utilize the moire effect caused by two superimposed gratings of identical or similar spatial frequency. One is the reference grating and it is a virtual grating created by a computer program in this research; The other grating is the image of grating projected on the measured surface by the DLP projector, and this grating will distort because of the different sloped profile of the surface. To superimpose the program-created grating and the captured distorted grating will derive the so-called moire effect. This research combined the basic theory of optical interferometry and moire effect to project the different phases of the projected grating fringes by the phase-shifting method and compute the principal value of arguments between -π,π. In the end, the phase unwrapping program based on discrete Fourier transform of solving PDEs is used to unwrap the phase of the measured surface, and finally the surface profile is derived by the optical measuring system.

以叠纹干涉术为基础的光学检测研究之发展早已行之有年，而在本研究中所采用的投影叠纹法(Projection moiré)之主要精神在於藉由两道空间频率相近或相同的光栅相互叠加而成的效应，其中一道为参考光栅，而本研究中的参考光栅是以程式产生可调整不同空间频率的虚拟光栅；另一道则为投影至待测物表面的光栅影像，而在起伏高度不一的待测表面上的光栅影像会受到待测物表面起伏状况不同而在观测方向产生光栅投影条纹影像的歪曲变形，将电脑产生的参考光栅与由影像撷取装置所获取投影於待测物表面的光栅影像作叠合，便会产生所谓的叠纹效应；利用基本的光学干涉理论与叠纹效应结合，本研究中以相移法来改变投影於待测表面的光栅相位，再以相移法的理论反运算出在带有待测面各点高度资讯之介於-π，π相位主幅角，再以离散傅立叶转换解偏微分方程的相位重建程式还原待测面的相位值，以得知待测面之表面轮廓。

The phase shifting of the inner reflecting light from the incline of ZF-7 prism is measured and its positive or negative sign can be judged, which is consistent with the theoretical result.

测量了ZF-7光学玻璃直角三棱镜斜面上内反射的相移，实验结果和理论计算吻合。同时给出了判断相移正、负的方法。

In particuler, for the first time, a rigorous method of calibrating the phase-shift of modulated photocurrent has been presented.

其中首次对调制光电流相移分析技术提出了一种严格校准调制光电流相移的方法。

In the crossed plane polariscope, by rotating the polarizer and the analyser at constant rate in synchronism and recording images by a CCD camera continuously, four phase-shifted images whose intensity are integrated by sensors are obtained.

在正交偏振光场下，按一定速度同步旋转起偏镜和分析镜，CCD摄像机可连续获取四幅相移光弹图像，由CCD像敏单元积分获得其光强值，通过所提出的相移法运算，可以迅速地得出全场等倾角和等差线的相位值。

Based on the influence of reflection phase of fibre Bragg grating on the transmission spectrum of fibre Bragg grating Fabry-Perot cavity, the reason for the error of traditional coupled mode theory when calculating the reflection phase of uniform FBG is analyzed.

基于光纤Bragg光栅反射复振幅相移对FBG法布里-珀罗腔透射谱的影响，分析了传统耦合模理论计算均匀FBG反射复振幅相移产生误差的原因。

Another type of ring resonance circuit doesn't have the same good results and needs to be improved.

而另一种环形谐振电路的移相器相移量较小，还有待进一步的研究和分析。

In chapter 3, the principle and method of Phase-Shifting Digital Speckle Pattern Intei-ferometry are studied.

第三章讨论了相移数字散斑干涉计量技术的原理和方法，并对相移求解方法及精度进行了详细的讨论。

The differential phase shift changes as the change in the thickness of the ferrite phase shifter is calculatedwith the transcendental equation.

根据超越方程对单环非互易铁氧体移相器的差相移随铁氧体厚度的变化进行了数值计算。

To realize automatic measuring of this method and improve it's precision, in this thesis the liquid crystal cell is used as a phase-shifter for the traditional DSSPI successfully. The phase-shifting DSSPI system is designed based on the liquid crystal phase-shifter and Wollaston prism.

为了进一步实现该方法的自动化检测，提高测试精度，在本论文中，成功的把液晶体做相移器应用于传统的数字错位散斑干涉计量，设计了基于液晶相移器和渥拉斯顿棱镜的数字错位散斑干涉系统。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。