Optical Time-Domain Reflectometer Fiber Sensing Localization
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Solution Overview
Problem
Conventional spectroscopy-based systems for remote sensing are complex and unable to localize signal sources along optical fibers, leading to overlapping spectral reflectance issues and inefficiencies in infield applications.
Innovation Solution
A system utilizing an optical time-domain reflectometer and electro-optical signaling units along the optical fiber to change the attenuation and/or reflection of an optical probe signal based on signals from sensors or devices, allowing for localization and efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spectroscopy-based system is used for remote sensing, then sensor information can be transmitted through optical fiber, but the system complexity increases and localization of signal sources becomes difficult
Solution Approach 1:
The patent replaces the complex spectroscopy-based optical system with a simpler time-domain reflectometry system. Instead of using spectral analysis with multiple wavelengths and complex optical components, the invention uses time-domain measurement of optical backscatter signals to achieve the same sensing function with reduced complexity
Solution Approach 2:
The patent changes the measurement parameter from spectral domain (wavelength-based) to time domain. By measuring the time of flight of optical backscatter signals, the system achieves both simplified architecture and localization capability, resolving the contradiction between reliability and complexity
2Reliability
If a spectroscopy-based system is used for remote sensing, then sensor information can be transmitted, but localization of signal sources along the optical fiber cannot be achieved
Solution Approach 1:
The patent introduces time-domain reflectometry as a replacement for spectral analysis, enabling localization by measuring the time of flight of optical backscatter signals from different locations along the fiber. This substitution provides both transmission reliability and precise localization capability
Solution Approach 2:
The system uses periodic optical pulses to probe the fiber at different time intervals. By sending repeated pulse sequences and measuring the time-of-flight of backscatter signals, the system achieves continuous monitoring and precise localization of signal sources along the optical fiber
3Loss of information
If multiple signal sources use different central wavelengths to avoid spectral overlap, then information can be transmitted, but the system complexity and wavelength management increase
Solution Approach 1:
The patent fundamentally changes the parameter domain from wavelength (spectral) to time. Instead of assigning different wavelengths to different sensors, the system uses time-division multiplexing where each sensor's signal is identified by its time of flight. This eliminates spectral overlap issues and wavelength management complexity while preserving all sensor information
Solution Approach 2:
The system creates temporal copies of the optical signal at different time delays corresponding to different sensor locations. Each sensor's information is copied into the time domain at a unique time position, allowing multiple sensors to share the same optical fiber without spectral interference
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
The system achieves low complexity and effective localization of signal sources, enabling efficient remote sensing with reduced spectral overlap and improved data transmission capabilities.
Implementation Method 1
an optical time-domain reflectometer, adapted to transmit an optical probe signal into an optical fiber and to measure a backscattered signal power
Implementation Method 2
at least one electro-optical signaling unit connected to said optical fiber, wherein the electro-optical signaling unit is configured to change an attenuation and/or a reflection of the optical probe signal depending on at least one signal provided by one or more signal sources
Data Source
AI summary
A system 1 for remote sensing of information to be transmitted, said system 1 comprising; an optical time-domain reflectometer, OTDR, 2 adapted to transmit an optical probe signal OPS into an optical fiber 3 and to measure a backscattered signal power; and at least one electro-optical signaling unit 4 connected to said optical fiber 3, wherein the electro-optical signaling unit 4 is configured to change an attenuation and/or a reflection of the optical probe signal OPS depending on at least one signal provided by one or more signal sources 5 in response to the information to be transmitted.