Embedded Optical Fiber Damage Detection in Composite Panels
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Solution Overview
Problem
Composite aircraft panels are difficult to inspect for damage, such as dents and cracks, as they do not visibly deform like metal panels, leading to potential undetected damage and reduced performance or catastrophic failure.
Innovation Solution
Embedding optical fibers within the composite panels and using an optical time domain reflectometer (TDR) to detect changes in optical impedance, allowing for the identification of damage by measuring the fiber's impedance against a baseline, which can detect pinches, bends, or breaks in the fiber geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional visual inspection methods are used for composite panels, then the inspection process is simple and quick, but damage detection reliability is poor because composite panels do not visibly deform like metal panels
Solution Approach 1:
The patent introduces optical fibers as an intermediary sensing element embedded within the composite panel structure. These fibers act as mediators that convert mechanical damage (pinching, bending, breaking) into optical signal changes (impedance variations), enabling reliable damage detection without requiring visual deformation of the panel itself.
Solution Approach 2:
The patent replaces conventional visual mechanical inspection with an optical measurement system. Instead of relying on human eyes to detect mechanical deformations, the system uses optical fibers to sense mechanical damage and converts it into optical impedance measurements that can be detected and analyzed automatically.
2Reliability
If optical fibers are embedded in composite panels to detect damage, then damage detection capability improves, but device complexity increases due to the need for embedding fibers and using specialized detection equipment
Solution Approach 1:
The optical fiber serves multiple functions: it acts as both a structural element within the composite panel and a sensing element for damage detection. The same fiber that provides structural integrity also detects pinching, bending, and breaking events, eliminating the need for separate sensing systems.
Solution Approach 2:
The optical fiber performs self-diagnosis by converting its own physical state changes (due to damage) into detectable optical impedance variations. The fiber essentially monitors its own integrity without requiring external active sensing elements or complex instrumentation.
3Productivity
If conventional inspection methods are used, then inspection time is short, but the possibility of undetected damage increases leading to reduced performance or catastrophic failure
Solution Approach 1:
The optical fiber provides continuous monitoring of the composite panel's structural integrity. Unlike intermittent visual inspections, the embedded fiber continuously senses impedance changes, enabling real-time damage detection and allowing for immediate response before catastrophic failure occurs.
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 method provides a reliable and efficient means to detect damage on composite panels, enabling early detection of issues and preventing potential failures by identifying damage points accurately and quickly.
Implementation Method 1
an optical time domain reflectometer configured to send the optical signal through the first input port and measure a strength of a reflected optical signal that is reflected back from the first optical fiber
Data Source
AI summary
The present disclosure describes an apparatus including a composite panel. The apparatus includes a first composite panel including a first optical fiber embedded therein, the first optical fiber being arranged in a pattern, and a first input port connected to a first end of the first optical fiber, the first input port configured to receive an optical signal from an optical time domain reflectometer. The optical time domain reflectometer is configured to send the optical signal through the first input port and measure a strength of a reflected optical signal that is reflected back from the first optical fiber, wherein the strength indicates a measured optical impedance of the first optical fiber. A measured optical impedance that is substantially the same as a baseline optical impedance for the fiber indicates no damage, while a measured optical impedance that differs from the baseline optical impedance by a predetermined threshold indicates damage.