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| | Through deduction by Vrenta Duda free volume diffusion theory,it was found that effect of molecular size on diffusion coefficient is exponential.The deduction was validated by experimental data,and predigested model of the effect of molecular size on diffusion coefficient was attained as lg D 2= ξ 21 lg D 1+2 331.This is significant in researching gradient index polymer optical fiber. | | 根据Vrenta Duda自由体积扩散理论的推论 ,说明分子体积对扩散系数有指数性的影响关系 ;利用实验数据验证了该推论 ,得到了分子体积对扩散系数影响的简化模型为lgD2 =ξ2 1lgD1+2 331。这对研究梯度型聚合物光纤折射率梯度形成具有较重要的理论意义 | | 文摘来源 | | Refractive index distribution of gradient index polymer optical fiber(GI POF) was simulated by Lorenz function and model of refractive index distribution was found firstly, which included three basic parameters: initial concentration, molecule bulk of dopant monomer and polymerization temperature. The refractive index distribution of GI POF adulterated by kinds of high refractive index dopant monomer in PMMA was predicted by the Lorenz functio... | | 利用洛仑兹函数对梯度型聚合物光纤 (棒 )中折射率分布曲线进行模拟 ,建立折射率分布的洛仑兹函数模型 .该模型只需掺杂物的初始浓度、分子体积和聚合温度 3个基本参数 .利用该模型对各种高折射率的掺杂物掺杂聚甲基丙烯酸甲酯 ( PMMA)制备的梯度型聚合物光纤中的折射率分布进行了预测 ,发现掺杂物的折射率比分子体积对折射率梯度的影响更大 ;惰性掺杂物中二苯硫 ( DPS)掺杂效率最高 ;共聚掺杂物中苯甲酸乙烯酯 ( VB)掺杂效率最高 | | 文摘来源 | | Knowledge of differential mode delay data of polymer optical fiber plays an important role in studying the dispersion characteristic of the fiber. Differential mode delay of step index-polymer optical fiber (SI-POF) and gradient index-polymer optical fiber (GI-POF) with various lengths is measured by the frequency-domain phase-shift technique. Due to the fact that the mode coupling and the mode-dependent loss can be neglected fo... | | 塑料光纤的微分模延迟数据对研究塑料光纤的色散特性具有非常重要的意义。采用频域相移法测量了不同长度的两种折射率分布塑料光纤 :阶跃型塑料光纤 (SI POF)和渐变型塑料光纤 (GI POF)的微分模延迟曲线。实验结果表明 ,由于短光纤可以忽略模式耦合和模式损耗 ,1m塑料光纤的微分模延迟测量值与理论计算值吻合得非常好。因此 ,频域相移法可以简单、方便、精确地测量塑料光纤的微分模延迟。此外 ,通过比较不同长度塑料光纤的微分模延迟曲线的变化 ,可在一定程度上分析光纤中存在的模式耦合。 | | 文摘来源 | |   |
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