Multiple-Wavelength Triboluminescent Optical Fiber Sensor for Composite Damage Classification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current damage sensing systems for structural health monitoring lack real-time detection capabilities and are limited in their ability to accurately classify damage modes in composite materials, particularly for detecting subtle and distributed damage.
Innovation Solution
A multiple-wavelength triboluminescent optical fiber sensor system is embedded within a target material, featuring a triboluminescent coating on its surface, which emits light when subjected to mechanical stress or damage, and is coupled with a photosensitive receiver to analyze and classify damage modes in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-wavelength triboluminescent sensor is used, then the device complexity is reduced, but the measurement precision and damage mode classification capability deteriorate
Solution Approach 1:
The sensor is segmented into multiple independent triboluminescent materials, each emitting at a different wavelength. This segmentation allows each material to respond to specific damage modes, enabling precise classification while maintaining a relatively simple overall sensor structure that can be integrated into the host material.
Solution Approach 2:
The sensor transitions from single-wavelength detection to multi-wavelength detection, adding a spectral dimension to the measurement. This dimensional expansion enables differentiation between damage modes based on their characteristic light emission wavelengths, significantly improving measurement precision without proportionally increasing device complexity.
2Measurement precision
If multiple triboluminescent materials are used for damage classification, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
Multiple triboluminescent materials are merged into a single integrated sensor system that can be embedded as one unit in the host material. The materials are positioned at different locations along the optical fiber, allowing simultaneous detection of multiple wavelengths through a single sensor assembly, thereby reducing the practical complexity increase.
Solution Approach 2:
The multi-wavelength sensor system achieves multi-functionality by detecting various damage modes (compression, tension, shear, impact) using a single integrated device. Each triboluminescent material contributes to a specific detection function, allowing the sensor to perform multiple damage classification tasks simultaneously without requiring separate sensors for each damage type.
3Measurement precision
If triboluminescent coating is applied to the optical fiber, then the damage detection sensitivity improves, but the manufacturing precision requirements increase
Solution Approach 1:
Different triboluminescent materials are applied to different local regions of the optical fiber surface, with each material optimized for detecting specific damage modes. This local quality approach allows each coated section to have tailored properties for its intended detection function, improving overall sensitivity while allowing manufacturing tolerances to be managed at each local stage rather than requiring perfect uniformity across the entire fiber.
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 real-time, distributed damage sensing and classification of damage modes, including compression and tension, in composite materials, even for barely visible damage, with enhanced sensitivity and accuracy through the use of multiple triboluminescent materials and advanced data analysis.
Implementation Method 1
Light which results from energy supplied to a material in the form of mechanical energy is known as triboluminescence; also referred to as mechanoluminescence or fracto-luminescence
Implementation Method 2
an optical fiber with an outer surface extending a length of the optical fiber with a triboluminescent material provided on the outer surface of the optical fiber
Data Source
AI summary
Embodiments of the present invention include a system and method for detecting or sensing damage within a target material, as well as related devices. In some embodiments, a damage sensing system including a target material, an optical fiber embedded into the target material, where the optical fiber has an outer surface running the length of the optical fiber, a photosensitive receiver, and a triboluminescent coating coated on the optical fiber.