2015 : Long-range displacement sensor based on SMS fiber structure and OTDR

Prof. Dr. Ir. Sekartedjo M.Sc
Dr.Dra Melania Suweni Muntini MT.
Prof. Dr. Drs Agus Rubiyanto M.Eng.Sc.
Agus Muhamad Hatta ST, MSi, PhD


This paper presents a long-range displacement measurement method by using a single-multi-single mode (SMS) fiber structure, attached to a flexible plate between two permanent poles and the optical time domain reflectometer (OTDR)-based interrogator. The SMS fiber structure sensors are prepared with two different configurations, i.e. straight and sinusoidal configurations. It is demonstrated that the displacement sensor can perform a displacement measurement with a range from 0 mm to 150 mm with a resolution of 0.159 mm. The sinusoidal configuration provides a better sensitivity than the straight configuration. The proposed sensor offers a low cost, and it can be implemented for quasi-distributed displacement measurement which is suitable for civil structure monitoring.