张文才 （中国电子科技集团公司第二十三研究所，上海 200400）   摘  要：针对光纤衰减变化常用的后向散射监测法和传输功率监测法存在的不足，提出了一种自动监测多根光纤衰减变化的方法。首先将多根光纤串联焊接，再利用计算机所编制的软件，控制光时域反射仪（OTDR）对所焊接的光纤串上的每根光纤逐段进行测试，从而实现对多根光纤的衰减变化的自动测试。该方法成本低廉，测试精度和工作效率大为提高。   关键词：编程；串联；焊接；程控；自动测试   中图分类号：TP216     文献标识码：A     文章编号：1672-4984（2007）01-0046-03   The way to supervise and measure automatically the change of attenuation of  multi-optic fibers ZHANG Wen-cai （China Electronics Technology Group Corporation No.23 Research Institute，Shanghai 200400，China）   Abstract: This paper presented a way to supervise and measure automatically the change of the attenuation of multi-optic fibers. The author welded the multi-optic fibers in series，and controlled the OTDR by computer program. So it is possible to supervise and measure automatically the change of the attenuation of the multi-optic fibers. The cost of method is two penny，measurement precision and work efficiancy are too higher.  Key words: Computer program；In series；Weld；Remote control；Automatic measurement