geometrical spreading model

Through analysis of test data in operation of trains,the quantitative relation equation between the running speed and the geometric attenuation characteristics under normal transmission conditions,the noise intensity in operation of the train is obtained.

通过分析列车运行试验数据 ,得出列车运行噪声在一般传播条件下几何衰减特性及噪声强度与运行速度的定量关系方程。

Discrimination,reflectivity and FSW(free spectrum width),which are determined by the geometric attenuation factor of optic field and reflectivity of two ends greatly,are the important factors of FFP(fiber Fabry-Perot).

反衬度、反射率、自由光谱带宽是FFP干涉仪的重要性能指标 ,而FFP腔光波几何衰减因子、端面反射率及腔长 3个参数又是影响这些指标的主要因素。