Impact Wave Monitoring in Soil Using a Dynamic Fiber Sensor Based on Stimulated Brillouin Scattering

Sensors

Qingsong Cui²  Sibel Pamukcu¹  Mesut Pervizpour¹ 

[1]Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, PA 18015, USA

[2] E-Mails:

[3]National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China

关键词: Brillouin scattering;    underground;    infrastructure;    dynamic strains;    vibration;   

DOI  :  10.3390/s150408163

来源: mdpi

【 摘 要 】

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).

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.