Year: 2025
Type: conference-paper
Abstract: Multi-Frequency Database Demodulation (MFDD) combined with chirped-pulse (CP) phase-sensitive OTDR (φ-OTDR) has been recently presented as a method for distributed acoustic sensing (DAS) systems that can reduce 1/f noise when compared to traditional φ-OTDR, achieving long-term stability, and enabling precise monitoring of perturbations over extended periods. However, so far, a requirement for the fiber to be unperturbed during fiber calibration stage (i.e., MFDD reference matrix acquisition) limited its application in real-world scenarios, since perturbations occurring at this stage would lead to distortions in posterior measurements. In this paper a self-correction of the MFDD reference matrix is proposed. Since the MFDD reference matrix can itself be treated as a traditional CP-φ-OTDR measurement, perturbations occurring during the fiber calibration stage can be measured and compensated for in post-processing. This concept is experimentally validated. A MFDD-CP-φ-OTDR measurement was performed in two fiber positions: one where large perturbations were applied during the calibration stage (and later corrected and compensated for in post-processing) are another where the fiber calibration stage was performed without perturbations (used as ground-truth for baseline performance). The two measurements showed similar performances, both in fast (100Hz) and slow/static measurements. This validates that the method can ensure accurate reference matrices even under strong environmental noise, which enhances the reliability of MFDD-CP-φ-OTDR systems in practical field conditions.
DOI: 10.1117/12.3061867
Authors: Pedro J. Vidal-Moreno, Marcos G. Barriopedro, Alejandro Rosado, Laura Hernández-Martín, Sonia Martin-Lopez, Hugo F. Martins
Language: English
Topic: Advanced Fiber Optic Sensors
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Awards: G1175115578, G121809054, G1561925909, G1655493574, G1822561598, G1855990336, G2004672529, G2090960224, G2262748287, G2309174360, G2601397997, G2660406951, G2868724560, G2972560514, G300979063, G3480869486, G3518538256, G3681454997, G3855449585, G4042783231, G425668148, G430777504, G4526231891, SUBMarine cablEs for ReSearch and Exploration, G5080475149, G5195188938, G5421974903, G6274293516, G6308324406, G6858431742, G7084143925, G7434936867, G7719039549, SAFE: Tsunami early warning System using Availableseafloor Fiber cablEs, G7968587079, G8347645112, G8952376534, G99296377
OpenAlex ID: W4410592180