Lomas G M
Appl Opt. 1969 Oct 1;8(10):2037-41. doi: 10.1364/AO.8.002037.
Fraunhofer holograms and their reconstructions show interference fringes when applied to tapered glass fibers, which do not occur with opaque fibers. The fringes are shown to be quantitatively related to fiber profile. The phase lag of fiber transmitted light is recorded as identifiable hologram fringes by interference with fiber-diffracted light. This also results in fringes in the reconstructed image. One fringe of both types, for a fiber refractive index n, represents a diameter change lambda/(n-1). Shape changes along a fiber not directly resolved by the optics are measurable. Profile measurement of attenuating glass fibers in the continuous filament process is described.
当将弗劳恩霍夫全息图及其重建应用于锥形玻璃纤维时会显示干涉条纹，而不透明纤维则不会出现这种情况。结果表明，这些条纹与纤维轮廓在数量上相关。通过与纤维衍射光干涉，纤维透射光的相位滞后被记录为可识别的全息图条纹。这也会在重建图像中产生条纹。对于折射率为n的纤维，两种类型的条纹中的一个条纹代表直径变化λ/(n - 1)。沿纤维的形状变化（光学系统无法直接分辨）是可测量的。本文描述了连续长丝工艺中衰减玻璃纤维的轮廓测量。
