Engineering Commons^™

A Novel Long-Period Fiber Grating Optical Sensor For Large Strain Measurement, Genda Chen, Hai Xiao, Ying Huang, Zhi Zhou, Yinan Zhang

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Critical buildings such as hospitals and police stations must remain functional immediately following a major earthquake event. Due to earthquake effects, they often experience large strains, leading to progressive collapses. Therefore, monitoring and assessing the large strain condition of critical buildings is of paramount importance to post-earthquake responses and evacuations in earthquake-prone regions. In this study, a novel large strain sensor based on the long period fiber grating (LPFG) technology is proposed and developed. CO₂ laser induced LPFG sensors are characterized for such mechanical properties as strain sensitivity in extension and flexure, sensor stability, and measurement range. For practical …