Advertisement
Published in:
01-06-2021
Large-dynamic-range fiber loop ringdown strain sensor using Frequency-shifted Interferometry
Published in: Optical and Quantum Electronics | Issue 6/2021
Log inActivate our intelligent search to find suitable subject content or patents.
Select sections of text to find matching patents with Artificial Intelligence. powered by
Select sections of text to find additional relevant content using AI-assisted search. powered by
Abstract
A fiber loop ringdown (FLRD) sensor combined with frequency-shifted interferometry (FSI) for large strain measurement was proposed and experimentally demonstrated. The FSI technique was employed to realize the space-domain FLRD sensing in which only continuous-wave light source and slow detection were required, and thus the sensing system cost were greatly reduced. A tapered multimode fiber was used as the sensor head for large strain measurement. By measuring the ringdown distance, the strain was monitored and a high strain sensitivity of 0.34 km−1 mε−1 was obtained, corresponding to a strain detection limit of 48.2 μɛ. As a benefit from good mechanical strength of multimode fiber, a dynamic range of up to 5 mε was achieved. The experimental results support that the proposed FSI-FLRD strain sensor has advantages of low cost, high sensitivity and good stability, which is suitable for health monitoring of concrete structures.