新型聚合物传像光纤制作方法探索

Development of the Fabrication Method for Novel Polymer Imaging Fiber

探索了新型聚合物传像光纤的制备方法。阐述了传像光纤中的光线传输理论及光纤设计理论,为传像光纤的研制提供理论指导。借助聚合物微结构光纤制作技术,在正六边形聚甲基丙烯酸甲酯(PMMA)微结构光纤预制棒的孔洞内填充高折射率的聚苯乙烯(PS)纤维,形成一次预制棒,热拉伸后熔并再拉伸,研制出直径为0.22mm,单丝直径为3μm的超高分辨率传像光纤。经过测试,该传像光纤可以分辨10μm的微刻度。探索用直径为0.25mm的特制PMMA芯/氟塑料包层光纤经过一步排列堆积制作传像光纤预制棒,拉伸制成直径为2mm,7200pixel,单丝直径为20μm的传像光纤。实验发现,吸附于光纤表面的灰尘对传像光纤的结构和图像质量有严重影响。

The fabrication method for novel polymer imaging fiber is developed. The theory of light propagation in fiber and fiber design is expatiated, which is the guide for developing imaging fiber. The material of polymethyl methacrylate （PMMA） is heated and extruded in a hexagon mold as microstructured fiber preform. The holes in it are filled with polystyrene （PS） fibers. It is the first preform used for heat-stretch and stackifusion to form a second preform. Then the second preform is heat-stretched to obtain imaging fiber with diameter of 0.22 mm and single fiber diameter of 3 μm. It is ultrahigh resolution imaging fiber, by which the microscale of 10 μm can be discerned. The method of one-step stack is used to stack 7200 pieces of customized polymer fibers as the multicore imaging fiber preform. The customized fiber with diameter of 0, 25 mm and coating thickness of 20 μm is fused together. The preform is heat-stretched to form imaging fiber of 2 mm diameter and 20μm single fiber diameter. It is found that the dust adsorbed on the fiber face seriously affects fiber＇s structure and image quality.