Dual Core Fiber Strain and Temperature Measurement
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Solution Overview
Problem
Existing methods for simultaneous strain and temperature measurement using dual fibers require precise installation to ensure both fibers experience identical conditions, leading to incorrect measurements if conditions differ.
Innovation Solution
A dual core optical fiber with cores having different refractive index profiles/compositions within the same cladding, allowing for simultaneous strain and temperature measurement using Brillouin Scattering, with means to couple light and calculate characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two separate fibers are used for strain and temperature measurement, then measurement capability is improved, but installation complexity and measurement accuracy deteriorate due to the need for precise alignment to ensure both fibers experience identical conditions
Solution Approach 1:
The patent combines two separate optical fibers into a single dual-core fiber structure. The first core is optimized for strain measurement while the second core is optimized for temperature measurement, both within the same fiber cladding. This merging eliminates the need for separate fiber installation and alignment, reducing installation complexity while maintaining the capability to measure both strain and temperature simultaneously.
Solution Approach 2:
The dual-core fiber structure provides multi-functionality by enabling both strain and temperature measurements through a single fiber installation. The first core responds primarily to strain with minimal temperature cross-sensitivity, while the second core responds primarily to temperature with minimal strain cross-sensitivity, allowing one fiber to perform multiple measurement functions that previously required separate fibers.
2Adaptability or versatility
If two separate fibers are used for strain and temperature measurement, then measurement capability is improved, but measurement precision deteriorates when fibers experience different conditions due to installation errors
Solution Approach 1:
By merging the strain-sensing core and temperature-sensing core into a single dual-core fiber structure, the patent ensures that both cores experience identical environmental conditions (temperature, stress, pressure) since they are embedded within the same fiber cladding. This physical integration eliminates measurement errors caused by differential conditions between separate fibers, thereby improving measurement precision while maintaining dual-parameter measurement capability.
3Ease of operation
If dual core fiber is used, then installation ease is improved, but device complexity increases due to the need for light coupling means and calculation systems
Solution Approach 1:
The dual-core fiber structure simplifies installation by requiring only a single fiber installation instead of two separate fibers, reducing field deployment complexity. The light coupling means and calculation systems, while adding some system complexity, are centralized and can be managed through integrated interrogation equipment that processes signals from both cores simultaneously, minimizing the practical impact on overall system complexity.
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 accurate simultaneous measurement of strain and temperature without the need for precise installation, as both cores within the same cladding experience identical conditions, facilitating easier field applications.
Implementation Method 1
measuring the Brillouin frequency shift along each of the fibers and by determining coefficients of Brillouin frequency shift versus strain and temperature
Data Source
AI summary
There is provided a system for measuring temperature and strain simultaneously utilizing Brillouin Scattering within an optical fiber. The system has a cladding, a first optical core within the cladding and a second optical core within the cladding and having a different refractive index profile and/or composition than the first core. Means to couple light into and out of said individual optical cores and/or from one optical core to the other within the fiber is provided along with means for calculating strain and temperature characteristics based on measured Brillouin frequencies for said optical cores.