[6a-A414-1~10] 3.8 光計測技術・機器

△ [6a-A414-8] 傾斜利用ブリルアン光相関領域反射計による世界最短ホットスポットの検出

〇李 熙永¹、水野 洋輔¹、中村 健太郎¹ (1.東工大)

キーワード：ブリルアン散乱、光ファイバセンサ、分布測定

To enable high-speed distributed strain/temperature measurement along optical fibers, we have developed a new configuration of Brillouin optical correlation-domain reflectometry (BOCDR)—named slope-assisted BOCDR (SA-BOCDR). Its basic operation has been investigated using both silica and plastic optical fibers, and besides, it has been proved that strained/heated sections even shorter than the nominal spatial resolution can be detected. Although this “beyond-nominal-resolution” effect is an attractive advantage for practical applications, the detection of strained/heated sections shorter than the current world record has not been demonstrated yet. Thus, in this work, by exploiting this special effect of SA-BOCDR, we demonstrate the detection of a 2- and 5-mm-long—shortest ever—strained and heated sections in the silica and plastic optical fibers and show that the usefulness of the beyond-nominal-resolution effect.