LIGHT REFLECTION METHOD FOR MEASURING TRANSMISSION LOSS OF OPTICAL FIBER LIGHT GUIDE,申请号JP19900023601-传众专利搜索

LIGHT REFLECTION METHOD FOR MEASURING TRANSMISSION LOSS OF OPTICAL FIBER LIGHT GUIDE

申请公布号：JPH02276942(A)

申请号：JP19900023601

申请日期：1990.02.01

申请公布日期：1990.11.13

申请人：

RENIN OTDELEN TSUENTORARU N ISUSUREDO INST SUFUYAJI RONIISU

发明人：MIHAIRU AREKUSANDOROBUITSUCHI BUHASHIETABU;URADEISURAFU NIKORAEBUITSUCHI KOROMISURICHIENKO

分类号：G01M11/02;G01M11/00;G02B6/00;H04B10/08

主分类号：G01M11/02

摘要：PURPOSE: To measure a loss in an arbitrary first light-conductor by jointing the first and the second light-conductors so that a minimum air gap is formed and measuring the energy of pulses reflected at the air gap. CONSTITUTION: Light pulse for inspection is outputted to the first light-conductor 4, and an energy N1 of the pulses reflected an the output end face of the first light-conductor 4 is measured. The first and second light-conductors 4 and 5 are jointed together so that a minimum air gap is formed, and further, an energy N2 of the pulses reflected at an air gap positioned between the first output end face and the input end face of the second light-conductor 5 is measured. Further, an energy N3 of the pulses reflected on the output end face of the second light-conductor 5 is measured, and from an equation 2μl2 =2ln (Nn -N1 )-ln N1 -ln N3 (where, l2 is a length of the second light-conductor), a light reflection loss at the second light-conductor 5 is obtained.