A dual-core optical fiber sensing optical cable and an optical fiber monitoring system

By using an independent parallel design of dual-core fiber optic sensing cables and a data processing platform, the problem of monitoring blind spots after cable breakage was solved, enabling continuous monitoring after cable breakage and improving the system's fault tolerance and reliability.

CN122130129APending Publication Date: 2026-06-02WUHAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN UNIV OF TECH
Filing Date
2026-02-11
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing fiber optic sensing systems cannot quickly and effectively handle fiber optic cable breaks, resulting in poor monitoring reliability and creating large-scale monitoring blind spots.

Method used

The system adopts a dual-core fiber optic sensing cable structure, with grating sensors engraved in both fiber cores to form independent and parallel sensing channels. When a cable breaks, one fiber core continues to transmit signals while the other continues to monitor. Combined with a data processing platform, cable breakage identification and signal reconstruction are achieved.

Benefits of technology

This technology enables continuous monitoring even after fiber optic cable breakage, improving the system's fault tolerance and monitoring reliability, reducing material costs and construction complexity, and enhancing measurement accuracy.

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Abstract

This invention provides a dual-core fiber optic sensing cable and a fiber optic monitoring system. The dual-core fiber optic sensing cable includes a first fiber core and a second fiber core, physically isolated from each other and encapsulated within the same sheath. Both the first and second fiber cores are inscribed with multiple grating sensors. The first fiber core includes a first proximal end near the demodulator and a first distal end away from the demodulator. The second fiber core includes a second proximal end near the demodulator and a second distal end away from the demodulator. The first proximal end receives probe light, enabling forward detection of the first fiber core, while the second distal end receives probe light, enabling reverse detection of the second fiber core. This invention forms two completely independent and parallel sensing channels. When the fiber optic cable breaks, the portion before the break point can continue to transmit signals via the first fiber core, and the portion after the break point can continue to transmit signals via the second fiber core, fundamentally avoiding single-point failure and improving the fault tolerance of the dual-core fiber optic sensing cable.
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