Abstract

Spectrum registration and spatial calibration are presented and demonstrated in optical frequency domain reflectometry based sensing system for achieving a wide strain measurement range. In both dynamic and static measurement case, the feasibility of the proposed method is evaluated. First, spectrum registration is demonstrated to demodulate strain value, which increases the data acquisition rate dozens of times and also keep the high measurement range. A measurement rate up to 800 Hz is achieved. Second, the general difficulty in large strain measurement is analyzed. The combination of spatial calibration and spectrum registration is, therefore, proposed to reduce the mismatch of the spatial segments in the case of large strain variation. The local measurement spectrum segment extracted by a narrow box window for spectrum registration is proposed to maintain a high spatial resolution. Strain exceeding 7000 με is demodulated with a gauge length of 5 mm accurately. Finally, graphic processing unit (GPU) technology is used to accelerate the data processing rate in the demodulation process, which makes it more hopeful for the practical application.

Improve accuracy and measurement range of sensing in km-level OFDR using spectral splicing method

Tingyi Zhu, Cuofu Lin, Jun Yang, Zhangjun Yu, Pengbai Xu, Kunhua Wen, Yuncai Wang, and Yuwen Qin
Opt. Express 31(13) 20980-20993 (2023)

Strain measurement with adaptive local feature extraction method based on special fiber OFDR system

Yuejuan Lv, XiangPeng Xiao, Hao Li, Ke Ai, Zhijun Yan, and Qizhen Sun
Opt. Express 32(4) 5043-5055 (2024)

Improvement of the strain measurable range of an OFDR based on local similar characteristics of a Rayleigh scattering spectrum

Kunpeng Feng, Jiwen Cui, Dong Jiang, Hong Dang, Yihua Jin, Xun Sun, Yizhao Niu, and Jiubin Tan
Opt. Lett. 43(14) 3293-3296 (2018)

Wide-range OFDR strain sensor based on the femtosecond-laser-inscribed weak fiber Bragg grating array

Cailing Fu, Ronglong Sui, Zhenwei Peng, Yanjie Meng, Huajian Zhong, Rongyi Shan, Wenfa Liang, Changrui Liao, Xiaoyu Yin, and Yiping Wang
Opt. Lett. 48(21) 5819-5822 (2023)

High spatial resolution distributed fiber strain sensor based on phase-OFDR

Jiong Li, Jiulin Gan, Zhishen Zhang, Xiaobo Heng, Changsheng Yang, Qi Qian, Shanhui Xu, and Zhongmin Yang
Opt. Express 25(22) 27913-27922 (2017)