Optical Fiber Regeneration Module for Distributed Vibration Sensing
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Solution Overview
Problem
Current distributed vibration sensing (DVS) systems based on fiber optics face limitations in sensing distance due to progressive depletion of light pulses, requiring complex and expensive pulsed lasers, and increased fiber layout complexity with auxiliary fibers for backscattered light rerouting, which is not effectively addressed by existing solutions.
Innovation Solution
A module and method for regenerating and conditioning forward light pulses at repeaters located between optical fiber segments, using regeneration means such as dispersion compensation and optical amplifiers to enhance optical performance, allowing for extended sensing distances without additional pulsed lasers or complex fiber layouts, and enabling detection of backscattered Rayleigh light for vibration sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional DVS systems use progressive light pulse transmission through fiber optics, then vibration sensing capability is achieved, but sensing distance is limited due to progressive depletion of light pulses
Solution Approach 1:
The patent introduces intermediate repeater stations positioned along the fiber optic path that act as mediators to regenerate and amplify light pulses. These repeaters receive depleted light pulses from the master device, restore their energy through optical amplification, and retransmit them further along the fiber, thereby extending the sensing distance beyond the limitations of direct transmission.
Solution Approach 2:
The patent divides the continuous fiber optic sensing path into multiple segments separated by repeater stations. Each segment operates with its own light pulse transmission cycle, allowing the system to overcome the cumulative energy depletion that would occur in a single continuous transmission path. This segmentation enables the total sensing distance to be extended by chaining multiple segments together.
2Length of stationary object
If additional pulsed lasers are deployed to extend sensing distance, then measurement range increases, but system complexity and cost increase significantly
Solution Approach 1:
Instead of deploying multiple independent pulsed laser systems, the patent uses optical repeaters that copy and regenerate the original light pulse signal from the master device. These repeaters create copies of the pulse waveform at intermediate points, maintaining signal integrity without requiring additional laser sources. This approach extends measurement range while avoiding the complexity of multiple synchronized laser systems.
Solution Approach 2:
The repeater stations serve multiple functions simultaneously: they amplify light pulses, regenerate signal waveforms, and extend sensing coverage. This multi-functionality eliminates the need for separate components for each function, reducing overall system complexity compared to deploying additional complete laser sensing systems at multiple locations.
3Measurement precision
If auxiliary fibers are used to route backscattered light to multiple detectors, then segment analysis capability is improved, but fiber layout complexity increases
Solution Approach 1:
The patent extracts the detection function from multiple separate detector locations and consolidates it at the master device location. By using optical circulators and switches at the repeater stations, the backscattered light from different fiber segments is routed back to the single master device detector, eliminating the need for multiple distributed detectors and their associated auxiliary fiber connections.
Solution Approach 2:
The patent merges multiple detection paths into a single detection point at the master device. Optical switching and routing mechanisms combine the backscattered light signals from different fiber segments into one common detection path, maintaining the ability to analyze individual segments while simplifying the overall fiber layout by eliminating redundant detector infrastructure.
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 significantly enhances the measurement range of DVS systems beyond conventional limits, maintaining system simplicity and preventing tampering of the master device, while allowing for more complex fiber segment topologies and redundancy, thereby improving the robustness and efficiency of vibration sensing.
Implementation Method 1
the means for conditioning the forward light pulses comprises an optical amplifier to compensate losses
Implementation Method 2
the means for conditioning the forward light pulses comprises dispersion compensation means to compensate pulse degradation
Implementation Method 3
analyzing the counter-propagating Rayleigh backscatter generated by a train of probe short light pulses
Implementation Method 4
the phase shift induced by this external phenomenon will change, varying the fringe pattern associated to that section of the fiber
Data Source
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AI summary
A distributed vibration sensing technique based on Backscattered Rayleigh light (402) is disclosed, enabling the measurement of greater optical fiber (400) lengths by using one or more regeneration modules (200) in which the optical light pulses (401) emitted by a master device (100) are received, conditioned and transmitted again into another optical fiber (400) segment. Pulse conditioning may comprise, for example, reshaping, filtering, amplification and isolation. Each regeneration module (200) further comprise detection means that receive the Backscattered Rayleigh light (402) of the next optical fiber (400) segment. That is, each optical fiber (400) segment is independently detected by a regeneration module (200), which then transmits the sensing information to a central server (600) through a communication network (500).