High-Resolution and High-Precision ϕ-OFDR Strain Sensing Scheme Based on Adaptive Phase Unwrapping and Wavelet Packet Denoising

• DOI: 10.1109/jlt.2023.3319693
• Publication Date: 2024-01-03T19:44:03Z
• Authors: Kaijun Liu; Guolu Yin; Zeheng Zhang; Pengxi Yang; Huafeng Lu; Duidui Li; Tao Zhu
• Keywords: Reflectometry; Gaussian Noise

In this article, a distributed strain sensing system based on standard single-mode fiber is implemented using the Phase-Optical Frequency Domain Reflectometry (ϕ-OFDR). Compared to traditional amplitude cross-correlation algorithms, phase demodulation can achieve higher resolution, but it more susceptible noise interference. To address issue, an adaptive suppression algorithm adjacent window boundary continuity conditions has been proposed correct error jumps in unwrapping process and recover difference curve. Additionally, wavelet denoising employed eliminate Gaussian white linear term, which weakens trade-off between resolution accuracy. With spatial of 15.8 μm, achieved 1.5 mm, root mean square 0.9343 μϵ single mode fiber.