Mid-Infrared Spectroscopy for Thermal Effect Measurement in Composite Materials
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Solution Overview
Problem
Current methods for determining the thermal effect in composite materials and surfacing films are inadequate, as they lack sensitivity and spectral detail, and do not accurately assess the extent of heat-induced damage, which can affect the mechanical and structural integrity of these materials.
Innovation Solution
A method using mid-infrared spectroscopy involves creating a series of composite material standards with increasing thermal exposure, irradiating them with mid-spectrum infrared energy, detecting the reflected energy, performing multivariate calibration on the spectra, and building a model to predict thermal exposure and mechanical properties, allowing for more accurate assessment of thermal effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional infrared spectroscopy methods are used to determine thermal effect in composite materials, then the measurement can be performed, but the sensitivity and spectral detail are insufficient to accurately assess the extent of heat-induced damage
Solution Approach 1:
The patent transitions from conventional infrared spectroscopy to mid-infrared spectroscopy, changing the spectral range parameter to improve sensitivity and spectral detail for detecting thermal effects in composite materials. This parameter change enables more accurate assessment of heat-induced damage while maintaining practical device complexity through the use of hand-held spectrometers.
2Measurement precision
If visual inspection is used to determine heat effect in composite materials, then the method is simple and quick, but heat effect may not be visually apparent leading to inaccurate assessment
Solution Approach 1:
The patent replaces visual inspection with mid-infrared spectroscopy, substituting a mechanical/optical detection system that can sense thermal effects at the molecular level. This substitution enables detection of heat effects that are not visually apparent, significantly improving detection accuracy and capability.
3Ease of manufacture
If heating blankets are used for repair of composite materials, then the repair process can be performed, but hot spots may cause overheating and additional thermal damage
Solution Approach 1:
The patent implements a feedback mechanism by using mid-infrared spectroscopy to continuously monitor thermal effects during the heating repair process. This real-time feedback enables operators to detect early signs of overheating and adjust heating parameters accordingly, preventing hot spots and additional thermal damage while maintaining repair feasibility.
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 more sensitive and detailed indication of thermal effects, enabling better assessment and prediction of heat-induced damage, facilitating convenient and flexible measurement with a hand-held spectrometer, and improving calibration to understand residual strength and physical properties.
Implementation Method 1
irradiating the composite material standards and/or the surfacing films with mid-spectrum infrared energy, detecting infrared energy reflected from the composite material standards/ surfacing films
Implementation Method 2
detecting infrared energy reflected from the composite material standards/ surfacing films
Data Source
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AI summary
A method of determining a physical property of a composite material includes providing a series of composite materials or surfacing films, which are subjected to increasing thermal experience to create a set of thermal effect standards, collecting mid-IR spectra on those standards, performing data pre-processing and then multivariate calibration on the spectra of the composite materials or surfacing films, and using that calibration to predict the thermal effect for samples in question.