1207 直列接続した干渉計型光ファイバセンサによるAEとひずみの同時計測(OS12-2 実験・計測における先端技術とその応用-非接触・非破壊評価-)

概要

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An approach to integrate the optical fiber sensors for simultaneous measurement was studied. Sensing elements for each of acoustic emission (AE) and strain are connected in series and composed a single Mach-Zehnder interferometer. Each signals can be obtained separately from the viewpoint of the direction of displacement and the time scale of observation. It was demonstrated that the proposed sensor detects proper AE signals and the signal-to-noise ratio of the detected waveform increases by 6 dB as compared with the parallel connection type sensor that was proposed previously. On the other hand, good stability of strain signals is achieved so that the appropriate strain value can be determined easily. These properties were also shown in the case that AE event was occurred during loading process. It was concluded that the series connection type sensor is preferable for simultaneous measurement of AR and strain.
2010-10-09