Measurement Error Compensation at Strain Area Edge in OFDR Using Local Spectrum Division Method
Changshuo Liang, Qing Bai, Xiaoxu Zhou, Yu Wang, Yan Tao Gao, Hongjuan Zhang, Baoquan Jin · Journal of Lightwave Technology · 2024
We presented the local spectrum division method in optical frequency domain reflectometry (OFDR) sensing system for mitigation of fake-peak errors at the edges of strain area. The measurement accuracy is improved with the compensation of the fake-peak errors. The origin of fake-peak errors at strain area edges are analyzed in theory, simulation and experiment. The OFDR system with the proposed local spectrum division method is capable of measuring strain up to 1900 μϵ at 15 m sensing range. Compared to conventional OFDR demodulation, the local spectrum division method reduces the root mean square error (RMSE) of measurement result from 0.00878 nm to 0.00026 nm.