偏波維持エルビウム添加ファイバにおけるダイナミックグレーティングの合成による分布型光ファイバ歪センサ:実験検証(光波センシング,光波制御・検出,光計測,ニューロ,一般)

概要

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We demonstrate experimentally a novel distributed fiber-optic strain sensor by localizing a dynamic grating in polarization maintaining Erbium-doped fiber (PM-EDF) using the technique of synthesis of optical coherence function (SOCF). The dynamic grating is written with light beams in one primary polarization axis of the PM-EDF, and read with a light beam in the other primary polarization axis. When a strain is applied to the fiber, the detected Bragg reflection frequency shifts in proportion to the birefringence change, which is proportional to the strain. By using the technique of SOCF, the dynamic grating is formed in a localized region, and its position can be scanned along the fiber. If the dynamic grating has not been formed at the part of the fiber where the strain is applied, the strain will not have any effect on the Bragg reflection frequency. In this way, we can determine the strain location by sweeping the localized dynamic grating along the fiber. In our experiment, a spatial resolution of 20cm is demonstrated.
社団法人電子情報通信学会の論文
2006-02-10