| 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. | When the two light beams recombine , they interfere and form a pattern that depends on the difference between the distances they traveled
当两束光重遇后将发生干涉，并形成一个依赖于两条光路光程差的图样。 |
| 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. | To compensate for low - frequency drift of the optical path - length difference and to keep the operation point on the most sensitive point , the reference mirror is adjusted with a actuator driven by a feedback loop
为了补偿光程差的低频漂移，将工作点稳定在灵敏度最高点，使用一个反馈控制系统驱动微位移器调整参考平面镜。 |
| 5. | The beam - splitter comprises three pairs of fully reflecting planar mirrors and partially reflecting planar mirrors . according to the workspace size and experimental requirement , they were placed with a distance of 195 - cm between two mirrors
空间分光延时系统由三对全反镜和部分反射镜构成，根据实验平台大小和实际需要调整镜片之间的距离，使相邻光束之间的光程差为390cm 。 |
| 6. | 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。 |
| 7. | 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) 。 |
| 8. | The emphasis was put on the main factors affecting its performance , such as : drift of the average frequency of interferometer ; drift of frequency difference of interferometer ; the changes of the interference add - on term of the gaussian beam during the measurement and its effects on the phase changes , as well as the relationship between the changes of the interference add - on term of the gaussian beam during the measurement with the movement of the measurement mirror
对双频激光干涉仪的工作原理进行了理论分析，着重分析了其主要影响因素：双频激光平均频率漂移；双频激光差频漂移；高斯光束干涉附加项在测量过程中的变化及其对相位变化的影响，与测量镜运动引起的程差变化的关系。 |
| 9. | However , one of the most serious impediments to wider use and improve precision of psi is its sensitivity to external vibration with the consequence that psi has rarely been used in a manufacturing in - situ and some special situations , such as that the optical path is very long or the detected unit is very large
通过严格控制环境条件(温度、气流、振动等) ，其理论光程差(位相)的最小分辨率可以达到nm的数量级。然而，由于干涉计量测试灵敏度高、精度高，对外界振动非常敏感，使它的应用范围受到限制。 |
| 10. | 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) 。 |
