Optical Fiber Cable Clearance Space for Strain Measurement
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Solution Overview
Problem
Conventional distributed optical fiber systems using multilayer armor cables face challenges in accurately measuring strain distributions due to manufacturing issues, leading to incorrect pressure and temperature evaluations, particularly in applications like carbon dioxide capture and storage where precise strain measurement is crucial.
Innovation Solution
An optical fiber cable with a gap between the optical fiber core and the armor cable, equipped with fixing members to securely attach the optical fiber core and armor cable, allowing for accurate measurement of pressure, temperature, and strain distributions using Brillouin and Rayleigh frequency shifts, and phase shifts, enabling precise deformation tracking along with the measurement object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the optical fiber core is tightly fixed within the multilayer armor cable during manufacturing, then the cable structure is more stable, but the measurement precision of strain distribution deteriorates due to residual strain and incorrect positioning
Solution Approach 1:
The cable structure is segmented into distinct functional zones: a central clearance space where the optical fiber core floats freely for accurate strain measurement, and outer armor layers that provide structural stability. This segmentation allows the measurement component to be isolated from mechanical constraints that would otherwise introduce residual strain.
Solution Approach 2:
The optical fiber core is extracted from the constrained armor cable structure and placed in a dedicated clearance space at the center. This extraction removes the fiber from the source of manufacturing-induced residual strain, allowing it to respond only to actual external strain on the cable.
2Length of stationary object
If the optical fiber core is positioned close to the armor cable wires, then the cable diameter is reduced, but the measurement precision of pressure and temperature deteriorates due to interference from mechanical stress
Solution Approach 1:
A clearance space acts as an intermediary zone between the optical fiber core and the armor cable wires. This space isolates the fiber from mechanical stress transmitted through the armor layers, allowing accurate pressure and temperature measurements without interference from structural loading.
3Reliability
If fixing members are added to secure the optical fiber core and armor cable, then the reliability of the cable structure improves, but the device complexity increases
Solution Approach 1:
Fixing members are applied locally at specific intervals along the cable rather than continuously throughout. This localized approach provides sufficient structural reliability to prevent fiber displacement while minimizing the overall complexity and material usage compared to continuous fixing.
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 solution enables accurate simultaneous measurement of pressure, temperature, and strain distributions, improving measurement accuracy and extending the lifespan of the optical fiber cable by reducing residual strain during manufacturing.
Implementation Method 1
measuring distributions of pressure, temperature, and strain of the measurement object by using a Brillouin frequency shift and a Rayleigh frequency shift of light entered into and scattered in the optical fiber cable
Implementation Method 2
measuring distributions of pressure, temperature, and strain of the measurement object by using a Brillouin frequency shift and a Rayleigh frequency shift of light entered into and scattered in the optical fiber cable
Implementation Method 3
measuring distributions of pressure, temperature, and strain of the measurement object by using a Brillouin frequency shift and a Rayleigh frequency shift of light entered into and scattered in the optical fiber cable
Implementation Method 4
measuring distributions of pressure, temperature, and strain of the measurement object by using a Brillouin frequency shift and a Rayleigh frequency shift of light entered into and scattered in the optical fiber cable
Data Source
AI summary
In an optical fiber cable that includes an optical fiber core for measuring pressure and a multilayer armor cable for measuring temperature, an annular clearance space having a desired thickness is formed between the optical fiber core and the multilayer armor cable and fixing members for fixing the optical fiber core and the multilayer armor cable are provided at predetermined intervals in the axial direction of the optical fiber cable.