应用于桥跨结构横向错位检测的光纤弯曲监测器硬件电路设计

该文基于光纤弯曲损耗原理,设计了一种针对桥梁伸缩缝横向错位位移检测的光纤弯曲监测器。当桥梁由于自身损伤累积到一定程度或受外力作用,桥梁伸缩缝产生横向、纵向及竖向错位时,对桥跨结构两侧预先敷设的光纤会造成拉动产生弯曲,此时光纤中弯曲损耗会急剧增大。通过检测光电转换后的电压值可以感知桥跨的错位程度,为桥梁提供最后一道安全保障,能够在桥梁垮塌前进行预警。

Hardware Circuit Design of Optical Fiber Bending Monitor Applied for Transverse Staggering Inspection of Bridge Span Structure

Based on the optical fiber bending loss principle,an optical fiber bending monitor to inspect the transverse staggering displacement of bridge expansion joint is designed.When its damage of the bridge accumulates to the limited extent or it is suffered by the external action,and the expansion joint of bridge gives birth to transverse,longitudinal and vertical staggers,the optical fibers embedded at both sides of the span structure are drawn to produce the bending.The bending loss in the optical fiber will suddenly increase here.The staggering extent of the span can be inspected through the voltage value after inspecting the photoelectricity conversion,which can provide the last security safeguard for the bridge and can forecast an alarm before the collapse of bridge.