Spatial resolution enhancement of distributed strain - Measurement using BOTDR by partial adhering optical fiber

摘要

Effective spatial resolution enhancement method for distributed strain measurement by BOTDR is proposed. According to theoretical analysis, it is proved that the apparent strain x{sub}p observed in an optical fiber partially adhered to a structure is proportional to the true strain a, whose ratio r=x{sub}p/a coincides with the ratio of the adhered length to the spatial resolution defined by the optical pulse width on condition a is small enough, and it is verified experimentally.