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通过理论分析得出光纤强度比玻璃的理论强度低的原因是存在微裂缝。为减少光纤表面的微裂缝采取了对刚拉制出来的光纤进行在线涂复,改进涂复和拉丝工艺等措施。文章探讨了几种材料用作光纤一次增强的效果。得到了一组合适的环氧-丙烯酸酯热固化涂复料配方,用它涂得的光纤取600毫米长的试样测得的最低强度为2公斤,平均强度达5—6公斤。用硅橡胶光纤涂料作光纤一次增强涂复得到的光纤取600毫米长的试样测得的最低强度为4公斤,平均强度高达7—8公斤(丝径φ150微米)。指出为进一步克服公里级光纤的低强度点必须大力加强予制棒质量,制造过程中的沾污对强度影响的研究。
The theoretical analysis shows that the reason that the strength of optical fiber is lower than the theoretical strength of glass is due to the existence of micro-cracks. In order to reduce the optical fiber surface micro-cracks taken just pulled out of the optical fiber coating on the line to improve coating and drawing process and other measures. The paper explores the effect of several materials used as an optical fiber enhancement. A suitable epoxy - acrylate thermosetting coating formulation was obtained. The minimum strength of the sample coated with 600 mm long fiber was 2 kg and the average intensity was 5-6 kg. Optical fiber coated with silicone rubber optical fiber as an optical fiber Reinforced coated optical fiber The minimum strength measured on a 600 mm long specimen was 4 kg and the average strength was as high as 7-8 kg (diameter φ150 μm). It is pointed out that in order to further overcome the low intensity point of kilometer-class optical fiber, we must greatly enhance the quality of the preform and the influence of the contamination on the strength in the manufacturing process.