起偏镜

Three main error sources are the variation of intensities, the orientation errors associated with the configurations of the polariscope and the initial stress existing in the model.

在五步彩色相移法确定等倾角的过程中，主要误差源有起偏镜或分析镜的方位角不准确、模型因边缘效应而产生的初应力和平面偏振仪光学系统中的光强变化。

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。

In chapter 3, characteristic paraments, focusing structure were discussed, the processing of double cell for phase conjugation was analyzed. Designing criteria of double cell phase conjugation mirror was given out. All phase aberrations could be compensated by using phase conjugation theoretically, but compensation is only effective to phase aberration of uniform polarizing state, it is not effective to aberration by thermally induced depolarization an diffractive effecting by aperture.

在第三章，我们讨论了SBS介质的特性参数，相位共轭镜的聚焦结构，分析了双池相位共轭镜的相互作用过程，给出了相位共轭镜的设计原则；从理论上讲相位共轭技术可以完全补偿热畸变以及因各种光学不均匀性造成的光束畸变，但是相位共轭技术只对偏振态均匀的相位畸变造成的光束畸变起补偿作用，而对由于热致双折射效应造成的退偏以及光束通过硬边光阑时的衍射效应造成的光束畸变无能为力。

The orientation of the principal stresses relative to the directions of the polarizer a nd first quarter -wave plate is of course immaterial.

主应力相对于起偏镜和第一个四分之波片方向的方位，当然是无关紧要的。

The orientation of the principal stresses relative to the directions of the polarizer and first quarter-wave plate is of course immaterial.

主应力相对于起偏镜和第一个四分之波片方向的方位，当然是无关紧要的。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。