Gagnaire H, Goure J P, Massot J N, Lambert A M
Appl Opt. 1979 Jul 15;18(14):2510-5. doi: 10.1364/AO.18.002510.
Study of the light scattered from an unclad optical fiber illuminated by a laser beam perpendicular to its axis gives a valuation of little defects of the fiber cross section. The shifts of some bright fringes that occur when the fiber is rotated are observed. Comparison between experimental measurements and ray interference computations shows that the cross section of the fiber under test is neither circular nor elliptical, but can be described with good approximation by a limited Fourier series, the coefficients of which are estimated.
对由垂直于其轴的激光束照射的无包层光纤散射光的研究，可以评估光纤横截面的微小缺陷。观察到光纤旋转时出现的一些亮条纹的移动。实验测量与光线干涉计算之间的比较表明，被测光纤的横截面既不是圆形也不是椭圆形，但可以用有限傅里叶级数很好地近似描述，其系数也得到了估计。
