Single Optical Interrogator for Simultaneous Multi-Fiber Distributed Sensing
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Solution Overview
Problem
Existing fiber optic monitoring systems require separate optical interrogators for different types of measurements, increasing installation costs and reducing compatibility with existing fiber deployment systems.
Innovation Solution
A system that allows for substantially simultaneous distributed measurements on multiple optical fibers using a single optical interrogator, employing a single interrogation system to connect multiple distributed measuring instruments and utilize frequency generators, pulse selector filters, or fast optical switches to manage multiple optical pulses and backscatter signals independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate optical interrogators are used for different types of measurements on multiple fibers, then measurement precision and reliability are improved, but device complexity and installation cost increase
Solution Approach 1:
The patent implements a single optical interrogator capable of performing multiple distributed measurement functions (temperature, strain, vibration, acoustic sensing) across multiple optical fibers simultaneously. The interrogator uses wavelength-division multiplexing to differentiate measurement types and fibers, allowing one device to replace multiple specialized interrogators while maintaining measurement reliability through dedicated processing channels for each measurement type
Solution Approach 2:
The patent segments the measurement functions by assigning different wavelength ranges to different measurement types and fibers. The optical spectrum is divided into distinct bands, with each band dedicated to a specific measurement function, allowing simultaneous independent measurements while using a single interrogator platform
2Measurement precision
If separate optical interrogators are used for different types of measurements, then measurement precision is improved, but installation cost increases
Solution Approach 1:
The interrogator is designed as a universal platform that can precisely measure multiple parameters (temperature, strain, vibration, acoustic signals) across multiple fibers using a single device. This eliminates the need for purchasing and installing multiple separate interrogators, significantly reducing installation costs while maintaining precision through dedicated measurement channels
Solution Approach 2:
The patent merges multiple measurement functions and multiple fiber monitoring capabilities into a single interrogator device. By combining what would traditionally require separate instruments into one integrated system, the installation cost is reduced while measurement precision is preserved through wavelength-division multiplexing and independent signal processing
3Device complexity
If a single optical interrogator is used for multiple fibers, then installation cost and complexity are reduced, but measurement precision and reliability may deteriorate
Solution Approach 1:
The interrogator segments the optical spectrum into distinct wavelength bands, with each band dedicated to a specific measurement function and fiber. This spectral segmentation allows the single interrogator to process multiple measurements independently without cross-interference, preserving measurement precision while simplifying the system
Solution Approach 2:
The patent uses wavelength-division multiplexing as an intermediary mechanism to separate and identify different measurement signals within the single interrogator. Each measurement type and fiber is assigned a unique wavelength signature, allowing the interrogator to precisely distinguish and measure each parameter independently despite handling multiple fibers simultaneously
4Productivity
If multiple separate interrogators are deployed, then simultaneous measurement capability is improved, but device complexity and installation complexity increase
Solution Approach 1:
The single optical interrogator is designed to simultaneously perform multiple distributed measurements across multiple fibers by utilizing wavelength-division multiplexing. Different wavelength ranges are assigned to different fibers and measurement types, enabling parallel data acquisition for temperature, strain, vibration, and acoustic sensing without requiring multiple separate instruments
Solution Approach 2:
The patent merges the simultaneous measurement capabilities of multiple interrogators into a single integrated device. By combining multiple measurement functions and multiple fiber monitoring into one system, the data acquisition efficiency is maintained while installation complexity is significantly reduced
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 cost-effective and compatible simultaneous measurement of different parameters across multiple optical fibers, enhancing data acquisition efficiency and reducing installation complexity.
Implementation Method 1
Fiber optic sensors employ the fact that environmental effects, such as pressure, strain, vibration, and temperature, can alter the amplitude, phase, frequency, spectral content, or polarization of light propagated through an optical fiber
Implementation Method 2
A system that allows for substantially simultaneous distributed measurements on multiple optical fibers using a single optical interrogator, employing a single interrogation system to connect multiple distributed measuring instruments and utilize frequency generators, pulse selector filters, or fast optical switches to manage multiple optical pulses and backscatter signals independently
Data Source
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AI summary
A distributed measurement system includes a first distributed optical sensing fiber deployed along a first desired measurement path and a second distributed optical sensing fiber deployed along a second desired measurement path. The system further includes an interrogation system coupled to the first distributed optical sensing fiber and to the second distributed optical sensing fiber. The system also includes a first distributed measuring instrument launch a first interrogating probe pulse set comprising a first pulse having a first frequency and a second pulse having a second frequency. The interrogation system is designed to direct the first pulse to the first distributed optical sensing fiber and the second pulse to the second distributed optical sensing fiber.