Trusted Time Beacons for Fiber Optic Sensor Synchronization
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Solution Overview
Problem
Traditional time synchronization methods, such as NTP and GPS, are inefficient and costly for large-scale wireless sensor networks due to energy constraints, computation limitations, and environmental obstructions.
Innovation Solution
A novel method utilizing trusted time beacons attached to distributed fiber optic sensing (DFOS) systems, which transmit synchronization signals wirelessly to sensor nodes and acoustically through fiber, allowing for centralized synchronization of data streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional NTP or GPS synchronization methods are used, then time synchronization can be achieved, but energy consumption increases and computation capability requirements increase
Solution Approach 1:
The patent introduces a fiber optic cable as an intermediary medium to transmit vibration signals from beacons to the DFOS interrogator. This mediator enables precise time synchronization without requiring sensor nodes to perform complex computations or consume excessive energy, as the DFOS system centrally processes the vibration signals to extract timing information.
2Measurement precision
If GPS devices are installed on each sensor node, then time synchronization can be achieved, but cost increases
Solution Approach 1:
The patent creates a virtual representation of GPS-like time synchronization functionality through the DFOS system. Instead of installing physical GPS devices on each sensor node, the system uses vibration signals transmitted through fiber optic cables to provide centralized time synchronization, achieving similar functionality at lower cost.
3Area of stationary object
If multiple beacons are deployed to cover large-scale areas, then coverage area increases, but device complexity increases
Solution Approach 1:
The patent makes the fiber optic cable serve multiple functions: it acts as both the communication medium for vibration signals from beacons and the sensing medium for the DFOS interrogator. This multi-functionality allows the system to achieve large-scale coverage without proportionally increasing system complexity, as the same infrastructure handles both signal transmission and sensing.
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
This approach enables accurate and efficient time synchronization of all sensor nodes over a large-scale coverage area, reducing the need for multiple beacons and minimizing energy consumption and costs.
Implementation Method 1
The beacons transmit their signal via two different mediums, (1) wirelessly to sensor nodes in the coverage area
Implementation Method 2
The beacons send their timestamps (or clock) by generating vibrations at the fiber through their built-in vibrators or speakers
Implementation Method 3
The fiber sensing interrogator detects the timestamp signal from the beacons including their unique locations
Data Source
AI summary
A method for time synchronization using distributed fiber optic sensing (DFOS) that employs several trusted time beacons that are attached to the DFOS sensing fiber which in turn is connected to the DFOS interrogator. The beacons transmit their signal via two different mediums, (1) wirelessly to sensor nodes in the coverage area, and (2) through vibrations on fiber to the DFOS/DAS system located at a trusted area such as the central office. Wireless broadcast to nearby sensors includes a timestamp and beacon ID. All the sensors in the field use one of the beacons in their vicinity (the one with the strongest signal) as their time reference and send the data back with the corresponding beacon index.