土木分野におけるセンサ技術の利用と可能性 (2)

[CS9-12] Experimental verification of viaduct vibration measurement using a hetero-core fiber optic accelerometer

*山崎 大志¹、渡辺 一弘¹、佐々木 博幸²、岩佐 宏一³、澤 健男³ (1. 創価大学、2. コアシステムジャパン、3. アイセイ)

Keywords:fiber optic sensor, accelerometer, vibration measurement, bridge

This report represents the performance on a viaduct of a hetero-core fiber accelerometer, which has both of cost efficiency equivalent to electrical sensors and robustness as fiber optic sensors. This accelerometer converts acceleration to transmission light loss, detected by a LED/PD measuring module. In a demonstration test, the accelerometer was clamped on a center of viaduct together with electric-based reference sensors, and then a dump car made traveled on the viaduct. Consequently, the proposed accelerometer measured vibrations in good agreement with the electrical accelerometer. Additionally, it was also discussed how to calculate displacement amplitudes from accelerations.