학술논문
Spatial Resolution Enhancement in OFDR Using Margenau Hill Spectrogram
Document Type
Periodical
Source
Journal of Lightwave Technology J. Lightwave Technol. Lightwave Technology, Journal of. 42(9):3399-3408 May, 2024
Subject
Language
ISSN
0733-8724
1558-2213
1558-2213
Abstract
We presented an optical frequency domain reflectometry (OFDR) demodulation method utilizing Margenau Hill Spectrogram (MHS) algorithm for spatial resolution enhancement while maintaining sensing accuracy at same level. The trade-off between spatial resolution and sensing accuracy is reduced due to the enhanced time-frequency concentration of MHS compared to conventional short-time Fourier transform (STFT). The capability and advantage of MHS in OFDR demodulation with improved spatial resolution is analyzed in theory, simulation and experiment. The OFDR system with the proposed MHS algorithm is capable of sensing strain up to 1500 μϵ. Compared to conventional OFDR using STFT with 50-point window length, the spatial resolution has improved from 5.0 mm to 0.1 mm, while the average sensing quality factor value at strained section maintained 0.515, which means the sensing accuracy stays at the same level.