Route-Wide Telecom Cable Tension Screening from Pole-Impact Waves
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional methods for monitoring fiber optic cable tension in telecommunications networks are expensive, time-consuming, and require significant technician effort, as they necessitate the installation of tension meters on multiple spans of cable.
Innovation Solution
Employing distributed acoustic sensing (DAS) to utilize the fiber optic cable itself as a sensing medium, integrating an interrogator to determine wave speed and tension forces through mechanical impacts on utility poles, enabling real-time tension screening along the entire cable length without external power or communication channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional tension meters are installed on multiple spans of fiber optic cable to measure tension, then precise tension measurement is achieved, but the process becomes expensive, time-consuming, and requires considerable technician time
Solution Approach 1:
The fiber optic cable serves dual purposes: as both the telecommunications transmission medium and as the sensing element for tension measurement. The cable itself generates the vibrational signals when impacted, and its inherent physical properties (density, tension, length) are used to determine tension forces, eliminating the need for separate measurement devices and reducing installation time and costs
Solution Approach 2:
The patent replaces traditional mechanical tension meters with an optical-based distributed acoustic sensing system. Laser pulses are sent through the fiber optic cable, and the backscattered light is analyzed to detect vibrational signals caused by mechanical impacts on utility poles. This substitution of mechanical measurement with optical sensing eliminates the need for physical tension meter installation while maintaining measurement precision
2Measurement precision
If traditional tension meters are used to measure cable tension, then accurate tension data is obtained, but the system complexity and equipment requirements increase
Solution Approach 1:
The fiber optic cable performs multiple functions simultaneously: it serves as the telecommunications data transmission medium, the sensing element for detecting vibrations, and the transmission medium for optical signals in the DFOS system. This multi-functionality eliminates the need for separate tension measurement equipment, reducing system complexity while maintaining measurement accuracy
Solution Approach 2:
The patent merges the telecommunications infrastructure with the monitoring system by integrating the DFOS interrogator and the fiber optic cable into a unified system. The same cable that carries data traffic also carries the optical sensing signals, and the same utility pole infrastructure that supports the cable also serves as the impact point for generating vibrational signals
3Reliability
If multiple tension meters are installed along the fiber optic cable route to monitor tension at multiple spans, then comprehensive tension monitoring is achieved, but the cost and installation complexity increase significantly
Solution Approach 1:
The fiber optic cable is divided into multiple sensing segments along its length, with each segment capable of independently detecting vibrational signals. The DFOS system can localize the source of vibrations and determine tension forces at different positions along the cable by analyzing the timing and characteristics of the vibrational signals, providing comprehensive monitoring coverage without requiring multiple discrete devices
Solution Approach 2:
The single fiber optic cable serves as a distributed array of sensors along its entire length, providing comprehensive tension monitoring coverage for all spans. The cable itself is the sensing medium, eliminating the need for multiple separate tension meters while achieving complete route-wide monitoring
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
Provides quick, reliable, and precise tension measurement of fiber optic cables by converting vibrational data into images for pole localization, achieving precise tension determination with minimal equipment and reduced operational costs.
Implementation Method 1
distributed acoustic sensing (DAS)...a field technician provides mechanical impacts on a utility pole suspending the fiber optic cable, the impacts having a time interval of t0; a machine learning process determines a wave speed associated with the impacts
Implementation Method 2
wave propagation techniques to obtain the tension force by first determining utility pole locations relative to the length of the fiber optic cable
Implementation Method 3
Vibrational data resulting from mechanical impacts to the utility poles are converted into images providing pole localization using an edge detection algorithm
Data Source
AI summary
A radio-controlled, two-way acoustic modem for operating with a distributed fiber optic sensing (DFOS) system including circuitry that receives radio signals including configuration information, configures the modem to operate according to the configuration information, and generate acoustic signals that are detected by the DFOS system. The acoustic modem includes one or more sensors that detect environmental information that is encoded in the acoustic signals for further reception by the DFOS system. The received configuration information may change the operating times, sensors or other operating aspects of the modem as desired an such information may be transmitted from a fixed location or a mobile vehicle.