| 1. | With the compensator in place any optical path difference arises from the actual path difference .
有了补偿板之后，任何光程差都只由实际程差引起。 |
| 2. | Would you explain why the path difference between the light waves must not be too great
否则光径差多少都可以差别在于是否能产生你所想见到的效应 |
| 3. | The stability of micro - birefringence optical path difference measuring system based on electro - optic modulation method is studied
提出用旋转半波片反射法测量半封闭玻璃制品应力，探讨以电光调制法为基础的微双折射光程差测量系统的稳定性。 |
| 4. | The paper introduced the theory of passive acoustic localization and the algorithm of space acoustic localization . by use of combined acoustic path difference , the paper amended the passive acoustic localization formula and improved the accuracy of localization
本文介绍了被动声定位的原理及空间声定位的算法，推导出了被动声定位公式，并利用声程差组合改进了被动声定位公式，提高了定位的精度。 |
| 5. | It is widely used to measure optical element , optical system , detection of optical surface and the physical quantities ( such as field of temperature , field of density ) related with optical path difference . the underlying measurement principle of psi is to determine the phase of the intensity signal in interferogram received at each pixel of an imaging device
移相干涉术( psi )作为快速、非接触的精密测量手段，已经广泛地应用于光学零件、光学系统、精密表面检测和其它一些与光程差参数相关的物理量的测量(如温度场、密度场等) 。 |
| 6. | Then the optical path difference can be obtained with psi algorithm and to use the phase value for each pixel to determine a height value for each pixel . a primary advantage of psi is its high precision . with careful control of environmental conditions , measurement precision to the nanometer scale or below is possible with psi
它的基本测量原理是，通过摄像系统( ccd )接受到的干涉图中空间坐标已知的各个像素点的光强信号，在压电晶体驱动参考光程有序变化时，采集到多幅干涉图的光强信号，由移相干涉法，由光强值得到被测光程差值(位相值) 。 |
| 7. | 3 . the principle of the interleaver based on the interference of polarized light is analyzed theoreticallyand the interleaver architecture of this kind is presented . a 50ghz interleaver is designed and the two series of interleaved spectrum like cosine function is obtained experimentally ; by using the tandem of two birefringent crystals with different optical path difference , we get the flattop spectrum
3 、分析了pbi型interleaver滤波器的基本原理，给出了一种pbi型interleaver滤波器结构；设计了50ghz光学梳状滤波器，实验得到了该器件两组交错分波类余弦输出光谱；采用不同光程差的晶体级联方案，实现了输出光谱平顶化。 |
