Indicator Device Isolating Dye from Fluorescence Interference
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Solution Overview
Problem
Conventional non-destructive evaluation techniques for thermal damage in carbon fiber composite aircraft parts are inefficient for in-situ monitoring and detecting incipient thermal damage, especially in large parts, due to interference from the material and the need for extensive setup times, and limited sensitivity and accuracy.
Innovation Solution
An indicator device with an optically reflective layer and a thermally sensitive dye within a polymeric material layer, which isolates the dye from the part being evaluated, allowing for non-destructive evaluation using broad-band absorbance spectroscopy, reducing interference and improving signal-to-noise ratio, and enabling faster data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence spectroscopy with thermally sensitive dyes is used, then thermal exposure monitoring is enabled, but interference from the part's fluorescence reduces signal-to-noise ratio and measurement quality
Solution Approach 1:
The patent extracts the harmful fluorescence interference by removing the dye from the part and placing it in a separate indicator device. This physical separation eliminates the overlap between part fluorescence and dye fluorescence, resolving the signal-to-noise ratio problem while maintaining thermal monitoring capability
Solution Approach 2:
The patent introduces an optically reflective layer as an intermediary between the part and the dye. This layer redirects excitation light onto the dye and reflects emitted light back to the detector, enhancing the dye's signal while preventing direct interaction between the part and dye that causes fluorescence interference
2Measurement precision
If conventional non-destructive evaluation techniques are used, then thermal damage detection is possible, but inspection time becomes excessive for large parts
Solution Approach 1:
The patent makes the part self-reporting by attaching an indicator device that automatically changes color or fluorescence based on the part's thermal exposure. This eliminates the need for slow, systematic scanning of large parts while maintaining accurate thermal damage detection
Solution Approach 2:
The patent uses thermally sensitive dyes that change color or fluorescence intensity in response to thermal exposure. This visual indicator system enables rapid assessment of thermal damage on large parts without requiring time-consuming systematic inspection
3Measurement precision
If thermocouples are used for temperature monitoring, then temperature measurement is achieved, but large area monitoring requires hundreds of thermocouples and extensive setup time
Solution Approach 1:
The patent merges multiple temperature measurement points into a single indicator device that can monitor thermal exposure across a large area. The optically reflective layer distributes excitation light across the dye layer, enabling simultaneous monitoring of multiple locations without requiring multiple separate sensors
4Measurement precision
If non-reversible temperature tabs are used, then temperature threshold detection is possible, but a large number of tabs are required without knowing the upper temperature exposure
Solution Approach 1:
The patent uses reversible thermally sensitive dyes that can dynamically respond to varying temperature exposures. The dye's fluorescence or color changes continuously with temperature, allowing monitoring of unknown temperature ranges without requiring multiple discrete tabs for different threshold levels
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
The solution provides accurate and efficient monitoring of thermal exposure and damage in aircraft parts by reducing interference and improving data quality, allowing for timely and effective detection of thermal damage without the need for extensive setup or specialized light sources.
Implementation Method 1
an optically reflective layer, which isolates the dye from the part being evaluated
Implementation Method 2
a dye disposed within the polymeric material layer, the dye being sensitive to external stimuli
Data Source
AI summary
An indicator device including a protective layer, an optically reflective layer, a polymeric material layer disposed between and coupling the protective layer to the optically reflective layer, and a dye disposed within the polymeric material layer, the dye being sensitive to external stimuli.