Working-State Cable Monitoring With DAS for Breakage Detection
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Solution Overview
Problem
Existing cable laying and movement processes face challenges in detecting and preventing damage to construction-material cables due to remote operation, background noise interference, and the inability to monitor sections beyond amplification repeaters, leading to potential large-scale losses and delays in detection.
Innovation Solution
A cable protection monitoring system using an optical fiber with a DAS interrogator to sense environment information, automatically classify abnormal events, and stop the cable's movement or installation when an abnormal event is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If remote operation of laying machines is used, then cable laying can be performed in difficult-to-reach areas, but real-time detection of abnormal events becomes difficult
Solution Approach 1:
An optical fiber sensing system is introduced as an intermediary between the cable and the monitoring system. The optical fiber acts as a distributed sensor that continuously monitors the cable's physical state and transmits this information to the shore-based control system, enabling real-time detection of abnormal events such as cable scratches, bends, or external forces without requiring direct human presence at the laying location.
2Measurement precision
If optical fiber sensing is used to monitor cable status, then real-time detection of abnormal events is enabled, but background noise from working conditions interferes with detection accuracy
Solution Approach 1:
The system applies different analysis methods to different sections of the optical fiber based on local conditions. Normal working vibrations are identified and filtered out by comparing against baseline patterns, while abnormal events are detected by identifying deviations from these patterns. This allows the system to maintain high detection accuracy despite the presence of background noise from cable laying operations.
3Length of stationary object
If amplification repeaters are installed in the cable, then long-distance cable transmission is enabled, but sections beyond the repeaters cannot be monitored
Solution Approach 1:
The optical fiber sensing system is divided into multiple independent monitoring sections, each extending beyond an amplification repeater. By segmenting the monitoring coverage and using the repeaters as reference points rather than barriers, the system achieves continuous monitoring throughout the entire cable length, including sections that extend beyond each repeater location.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables real-time monitoring and immediate action to prevent cable damage, reducing losses and costs by allowing for timely repairs and minimizing regression.
Implementation Method 1
an optical fiber having at least one core included in a wire cable-shaped construction material... an interrogator that acquires environment information in each location of the construction material sensed by the optical fiber
Data Source
AI summary
To suppress expansion of damage to a working-state cable due to work being continued without detecting breakage of the working-state cable when the breakage occurs, the working-state cable protection monitoring system is provided with: a working means that moves or installs a wire cable-shaped construction material including an optical fiber having at least one core; an interrogator that acquires environment information about each position of the construction material, sensed by the optical fiber; and an abnormal event detection means that, when the environment information acquired at each position of the construction material satisfies an abnormal pattern, detects an abnormal event at the position, where in the working means stops movement and installment of the wire cable-shaped construction material when the abnormal event has been detected.