一种提高OTDR动态范围的分段测量方法

A segmental measurement for improving the dynamic range of OTDR

针对基于辐照光纤的分布式温度传感器的检测需求,提出了一种分段测量光纤损耗,从而提升光时域反射仪(OTDR)动态范围,进而增加分布式测温点数的方案。首先阐述了辐照光纤的特点,并对OTDR的动态范围做简要分析,在此基础上,给出了分段测量的具体方法。搭建OTDR系统对分段测量方案进行验证,实验结果表明,使用分段测量方法时,可以在不损失温度分辨率的前提下,增加分布式测温点的个数。

A segmental measurement is proposed in view of the detection requirements of the distributed sensor based on irradiated fiber,and the dynamic range of OTDR is improved consequently,which increases the number of sensing points.The feature of irradiated fiber is given and the dynamic range of OTDR is analyzed theoretically.Based on the analysis,the concrete designing method for the segmental measurement is given.A OTDR system is built and an experiment for the segmental measurement method is carried out,the test results show that the number of sensing points can be increased without reducing temperature resolution when adopting the segmental measurement method.