Composite Structure Embedded Optical Fiber Quantum Dot Sensing
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Solution Overview
Problem
Composite structures face challenges in detecting anomalies such as misorientation or misplacement of structural fibers within the resin, which can impact their physical properties, as these defects often reside within the interior and are difficult to detect using conventional inspection techniques.
Innovation Solution
Incorporating optical fibers with quantum dots into composite structures to create a non-linear optical effect that indicates defects, allowing for reliable detection of deviations in fiber orientation and other defects through a monitoring system that includes a signal source, detector, and reflector, enhancing sensitivity and interaction with the local strain field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inspection techniques (visual inspection, x-rays, ultrasonic signals) are used to detect interior anomalies, then some defects can be detected, but the detection precision and reliability are insufficient for detecting fiber misorientation and misplacement within the resin
Solution Approach 1:
The patent replaces conventional mechanical/physical inspection techniques (x-rays, ultrasonic signals) with an optical sensing system. Optical fibers with quantum dots are embedded within the composite structure to detect fiber misorientation and misplacement through optical property changes, providing superior detection precision for interior anomalies that conventional techniques cannot reliably identify
Solution Approach 2:
The patent incorporates quantum dots into the optical fiber structure to create a composite sensing material. The quantum dots enhance the optical properties of the fiber, enabling it to detect subtle changes in the composite structure such as fiber misorientation and misplacement with high precision, overcoming the limitations of conventional inspection methods
2Measurement precision
If optical fibers with quantum dots are incorporated to enhance non-linear optical properties for defect detection, then detection sensitivity is improved, but the device complexity increases
Solution Approach 1:
The patent merges the quantum dots directly into the optical fiber structure, creating an integrated sensing element. This combination eliminates the need for separate quantum dot application steps and simplifies the overall system architecture, reducing device complexity while maintaining high detection sensitivity for fiber misorientation and misplacement
Solution Approach 2:
The optical fiber with embedded quantum dots serves multiple functions: it acts as both the structural component for light transmission and the sensing element for detecting fiber misorientation and misplacement. This multi-functionality reduces the need for additional specialized components, thereby simplifying the overall detection system
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 system effectively detects defects within composite structures, facilitating further inspection and repair by identifying non-linear effects caused by defects, such as deviations in fiber paths or ply dislocations, thereby ensuring the structural integrity of composite materials.
Implementation Method 1
optical fiber having a plurality of quantum dots that enhance the non-linear optical properties of the optical fiber. As such, defects or other current or past changes or states (hereinafter generally referred to as "defects") within the composite structure may cause the quantum dots to create a non-linear effect that is readily discernible
Implementation Method 2
optical fiber having a plurality of quantum dots that enhance the non-linear optical properties of the optical fiber
Implementation Method 3
an optical fiber within the composite structure; a signal source coupled to the optical fiber configured to provide signals to the optical fiber for propagation therealong
Implementation Method 4
the system further comprises a reflector positioned at the second end of the optical fiber so as to reflect the signals through the optical fiber from the second end toward the first end
Data Source
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AI summary
A composite structure having an embedded sensing system is provided, along with corresponding systems and methods for monitoring the health of a composite structure. The composite structure includes composite material and an optical fiber disposed within the composite material. The optical fiber includes a plurality of quantum dots for enhancing its non-linear optical properties. The quantum dots may be disposed in the core, in the cladding and/or on the surface of the optical fiber. The optical fiber is configured to support propagation of the signals and to be sensitive to a defect within the composite material. The quantum dots create a non-linear effect, such as a second order effect, in response to the defect in the composite material. Based upon the detection and analysis of the signals including the non-linear effect created by the quantum dots, a defect within the composite material may be detected.