Fiber Optic Sensor Coupling Channel for Strain Measurement
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Solution Overview
Problem
Poor coupling between fiber optic sensors and the structures they are monitoring can lead to erroneous data on structural integrity, particularly in applications like bridges and oil well pipes, due to inadequate affixment methods.
Innovation Solution
A method involving a channel made of materials like metal, ceramic, or polymer securely affixed to the structure, filled with a coupling material such as thermoplastic or crosslinkable polymers, and optical fibers placed within this channel to ensure tight and uniform coupling, allowing for accurate strain measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional affixment methods are used to attach fiber optic sensors to structures, then installation is simple, but coupling is poor leading to erroneous strain measurements
Solution Approach 1:
The patent introduces a coupling material as an intermediary substance between the fiber optic sensor and the structure. This coupling material fills the interface gap and ensures 100% coupling, eliminating air gaps that cause measurement errors while maintaining a relatively simple installation process.
Solution Approach 2:
The patent embeds the fiber optic sensor within a channel that is itself attached to the structure. The sensor is nested within the channel, and both are embedded in the coupling material, creating a nested configuration that ensures tight coupling and protects the sensor while maintaining structural integrity.
2Reliability
If fiber optic sensors are loosely coupled to structures, then installation is easy, but coupling efficiency is poor resulting in measurement errors
Solution Approach 1:
The coupling material serves as a mediator that ensures reliable mechanical and optical coupling between the sensor and structure. It eliminates voids and air gaps that would compromise measurement reliability, while the material's properties allow for relatively simple application during installation.
Solution Approach 2:
The patent applies coupling material specifically at the critical interface region between the sensor and structure, ensuring high-quality coupling where it is most needed for accurate measurements, while the rest of the system maintains simplicity.
3Measurement precision
If inadequate affixment methods are used, then installation process is simple, but coupling between sensor and structure is poor
Solution Approach 1:
The coupling material acts as an intermediary that ensures complete contact between the sensor and structure, eliminating measurement precision issues caused by poor coupling, while the application method remains relatively simple and does not significantly increase system complexity.
Solution Approach 2:
The channel is pre-formed and attached to the structure before the fiber optic sensor is installed. This preliminary preparation ensures that when the sensor is placed in the channel and coupled with material, 100% coupling is achieved without requiring complex post-installation procedures.
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 provides secure and accurate strain measurements by ensuring 100% coupling of the fiber optic sensors to the structure, enhancing the reliability of structural integrity assessments.
Implementation Method 1
The optical fiber sensing element is placed on, or in, the coupling material. Coupling material is placed in the channel to uniformly surround the fiber optic sensing element and tightly couple the fiber optic sensor to the apparatus under test.
Data Source
AI summary
Embodiments are directed to a method and device for coupling an optical fiber sensing element to an apparatus under test. A channel is affixed to the apparatus under test. The channel is partially filled with a coupling material. The fiber optic sensing element is placed on the coupling material. Coupling material is placed in the channel to uniformly surround the fiber optic sensing element and tightly couple the fiber optic sensing element to the apparatus under test.