基于受激布里渊散射的动态光纤传感器用于土壤中的冲击波监测。

Impact wave monitoring in soil using a dynamic fiber sensor based on stimulated brillouin scattering.

作者信息

Cui Qingsong, Pamukcu Sibel, Pervizpour Mesut

机构信息

National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China.

Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, PA 18015, USA.

出版信息

Sensors (Basel). 2015 Apr 8;15(4):8163-72. doi: 10.3390/s150408163.

DOI:10.3390/s150408163

PMID:25856327

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4431247/

Abstract

The impact wave response of soil due to a ball drop is monitored on a 30.5 cm by 30.5 cm square soil box using a fiber sensor with dynamic strain sensing capability. The experiments are conducted in real time using a simple one-laser one-modulator configuration with stimulated Brillouin scattering. The embedded BOTDA sensor grid successfully monitored the distribution and evolution of the inner strains of a sand bed during a mass impact on its surface. The measurement of the distributed dynamic strains was possible in several milliseconds and with 1 cm actual location resolution. This paper presents a time-domain signal analysis utilized for determining the dynamic strains in embedded fiber sensor. The results demonstrate the method to be a promising one for detection of subsurface vibration and movement in geotechnical Structure Health Monitoring (SHM).

摘要

使用具有动态应变传感能力的光纤传感器，在一个30.5厘米×30.5厘米的方形土箱中监测因落球引起的土壤冲击波响应。实验采用具有受激布里渊散射的简单单激光单调制器配置实时进行。嵌入式布里渊光时域分析（BOTDA）传感器网格成功监测了沙床表面受到质量冲击时内部应变的分布和演变。能够在几毫秒内以1厘米的实际位置分辨率测量分布式动态应变。本文提出了一种用于确定嵌入式光纤传感器中动态应变的时域信号分析方法。结果表明，该方法在岩土结构健康监测（SHM）中检测地下振动和移动方面具有广阔前景。