The method is based on measuring the deflection of rays from a collimated light beam due to gradients in refractive index.
平行光通过折射率存在梯度的场，光线产生偏转，即产生云纹效应。
Another important application of diffraction theory is the study of the far field divergence Angle of a collimated light beam.
衍射理论的另一个重要应用就是研究准直光束的远场发散角。
New technique of measuring 3d displacement field of object's surface by multiple overlapping holography to use collimated light beams is investigated.
本文研究用平行光多重全息术分析测量物体表面三维位移场的新技术。
On the basis of theories of physics, geometrical optics and photometry, the optical properties of collimated light beam incident upon single fiber perpendicular to the fiber axis are studied.
结合物理学的基本原理和几何光学的基本规律以及光度学的基础理论等三方面，研究了单纤维在平行均匀光束垂轴入射时的光学性质。
On the basis of theories of physics, geometrical optics and photometry, the optical properties of collimated light beam incident upon single fiber perpendicular to the fiber axis are studied.
结合物理学的基本原理和几何光学的基本规律以及光度学的基础理论等三方面，研究了单纤维在平行均匀光束垂轴入射时的光学性质。
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