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OPTICAL FIBER SYSTEM OPERATING UNDER RADIATION ENVIRONMENT AND IF LIFETIME EVALUATION METHOD
OPTICAL FIBER SYSTEM OPERATING UNDER RADIATION ENVIRONMENT AND IF LIFETIME EVALUATION METHOD
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机译:辐射环境下的光纤系统运行及寿命评估方法
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摘要
PURPOSE: To extend the length of fiber in the system by grasping the transmission loss increasing characteristics of optical fiber due to radiation and evaluating the lifetime accurately, thereby eliminating the need of shortening the fiber length to attain an undue margin. ;CONSTITUTION: The transmission loss increasing phenomenon under radiation environment is modeled and the lifetime of fiber is evaluated. Assuming that the increase L of transmission loss is caused by generation of defect due to irradiation at dose rate 7, the temporal variation rate is determined and the lifetime (t) of fiber is calculated for an arbitrary dose rate γ according to a formula; t=(1/b)×log{(a×y)/(a×γ-b×L0)}, where L0: increase of transmission loss determini,nq the lifetime (t), (a) and (b): constant and coefficient determined from experimental results (including temperature). The increase L of transmission loss at a lifetime (t) is determined according to a formula; L={(a×γ)/ b}×{1-e×p(-b×t)}. When the allowance of initial transmission loss is set at a value obtained by subtracting the increase L from dynamic range or less, the fiber length can be extended without requiring undue margin.;COPYRIGHT: (C)1995,JPO
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机译:目的:通过掌握由于辐射引起的光纤传输损耗增加特性并准确评估使用寿命,从而延长系统中的光纤长度,从而无需缩短光纤长度以获得不适当的余量。 ;构成:对辐射环境下的传输损耗增加现象进行了建模,并评估了光纤的寿命。假定由于以剂量率7照射引起的缺陷的产生而引起传输损耗的增加L,则根据式求出时间变化率,并针对任意剂量率γ求出纤维的寿命(t)。 t =(1 / b)×log {(a×y)/(a×γ-b×L 0 Sub>)},其中L 0 Sub>:传输损耗增加寿命(t),(a)和(b):由实验结果(包括温度)确定的常数和系数。寿命(t)下的传输损耗的增加量L根据公式确定; L = {(a×γ)/ b}×{1-e×p(-b×t)}。当将初始传输损耗的允许值设置为通过从动态范围中减去增量L或更小值而获得的值时,可以延长光纤长度而无需过多的余量。;版权:(C)1995,JPO
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