Moisture Detection in Composite Panels via Microwave Heating
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Solution Overview
Problem
Current methods are inadequate for detecting moisture levels in composite sandwich panels, particularly those with foam or honeycomb cores, as they fail to accurately measure and map moisture levels, leading to issues like bubbling and production delays in aircraft manufacturing.
Innovation Solution
A system comprising an electromagnetic radiation system, an infrared detector, and a controller that transmits a pulse of electromagnetic radiation absorbed by water molecules and detects infrared energy to determine moisture levels in composite sandwich panels, using a phased array and beam steering for precise detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional inspection methods are used to detect moisture in composite sandwich panels, then the inspection process is simple, but the detection precision and ability to map moisture levels is insufficient
Solution Approach 1:
The detection system is segmented into multiple functional components: electromagnetic radiation source, phased array antenna elements, infrared detectors, and processing units. Each component performs a specific function in the moisture detection chain, allowing for optimized performance of each segment while maintaining overall system precision.
Solution Approach 2:
The patent transitions from traditional single-point or surface-level moisture detection to three-dimensional moisture mapping within the composite panel. By using electromagnetic radiation penetration and infrared detection, the system creates depth-resolved moisture distributions, adding a spatial dimension to moisture detection capability.
2Reliability
If moisture detection is performed late in production, then production flow is maintained, but bubbling occurs and rework is required
Solution Approach 1:
The electromagnetic radiation and infrared detection system enables moisture detection to be performed early in the production process, before composite panels are assembled into final aircraft structures. This preliminary detection identifies moisture issues during manufacturing, preventing bubbling and eliminating the need for time-consuming rework later.
Solution Approach 2:
The system provides real-time feedback on moisture levels within composite sandwich panels during production. The infrared detectors measure thermal responses that correlate with moisture content, and this information is processed to provide immediate quality feedback, allowing producers to take corrective action before defects manifest as bubbling.
3Measurement precision
If comprehensive moisture mapping is implemented, then moisture level precision is improved, but detection time and processing complexity increase
Solution Approach 1:
The system uses pulsed electromagnetic radiation followed by periodic infrared detection at multiple time points. This time-resolved measurement approach captures the thermal response evolution, enabling precise moisture quantification through analysis of the temporal response characteristics without requiring continuous measurement.
Solution Approach 2:
The patent exploits changes in thermal parameters (infrared radiation intensity and temporal response) that occur when electromagnetic radiation interacts with moisture-containing materials. By measuring these parameter changes rather than directly measuring moisture, the system achieves precise moisture level detection through indirect but highly sensitive thermal response measurements.
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 accurate detection and visualization of moisture levels within composite sandwich panels, allowing for timely identification and management of moisture-related issues, reducing production delays and costs.
Implementation Method 1
transmit a pulse of electromagnetic radiation having at least one wavelength that is absorbed by water molecules
Implementation Method 2
transmit a pulse of electromagnetic radiation absorbed by water molecules
Implementation Method 3
detect an amount of infrared energy in the composite sandwich panel in response to transmitting the pulse of electromagnetic radiation
Data Source
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AI summary
A system (102) and a method for detecting moisture (106) in a composite sandwich panel (108) for an aerospace vehicle, wherein a microwave pulse (116) is transmitted into the composite sandwich panel (108) such that it is heated, and the generated infrared radiation (122) is detected using a time window (128). The detected infrared radiation (122) indicates a level of moisture (106) in the composite sandwich panel (108).