金属管封装光纤光栅用于建筑钢筋应变的测量

Strain Measurement in Construction Steel Bar Using a FBG Sensor Coated by a Thin Metal Tube

把光纤Bragg光栅(FBG)封装于薄金属套管中以保护光栅,把封装后的FBG贴于2种建筑钢筋上,用拉伸机拉伸钢筋。通过监测FBG反射峰的漂移测量钢筋的应变,细致考察了波长漂移量与应变大小的关系。实验结果表明,光栅反射波峰值移动和拉力大小之间有着良好的线性关系,对两种钢筋的线性度分别达到0.9956和0.9995。

The fiber Bragg gratings (FBG) were coated with thin metal tube for protection and adhered to two different constructional bars. Pulling the bars and the Bragg wavelengths of the FBG were shifted. The experimental result indicates that the shifts of Bragg wavelengths are in good linear relationship with the pulling force: the linearities are 0.9956 and 0.9995 for two kinds of steel bars respectively. The experimental result agrees well with theory.