Two-Slope Reference Curve for Thermal Imaging Sensitivity
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Solution Overview
Problem
Existing thermal imaging techniques face challenges in deep flaw detection in anisotropic media, as the ingoing thermal pulse follows 1-D heat flow while the returning pulse follows 2-D flow, requiring adjustment of temperature-time reference curves to improve sensitivity.
Innovation Solution
A two-slope reference for synthetic thermal time-of-flight imaging is introduced, where two lines of variable slope are joined at an adjustable point in time to create a continuous slope, allowing for accurate thickness measurement of objects using high-speed infrared transient thermography without the need for separate reference standards or special coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single-slope reference curve is used for thermal imaging, then the method is simple and easy to implement, but the sensitivity to deep flaw imaging is insufficient
Solution Approach 1:
The reference curve is segmented into two distinct linear portions with different slopes. The first portion (steeper slope) represents 1-D heat flow for shallow flaws, while the second portion (shallower slope) represents 2-D heat flow for deep flaws. This segmentation allows the single reference curve to accommodate both heat flow regimes, improving sensitivity to deep flaws without requiring multiple separate reference curves.
Solution Approach 2:
The reference curve transitions from a static single-slope design to a dynamic two-slope structure that adapts to different heat flow conditions. The junction between the two slopes occurs at a variable time point that can be adjusted based on the specific imaging requirements and material properties, allowing the reference curve to dynamically match the thermal response characteristics of the tested material.
2Reliability
If two lines of variable slope are joined at an adjustable point in time, then the slope is continuous at the junction and deep flaw detection is improved, but the complexity of the reference curve increases
Solution Approach 1:
The reference curve is pre-configured with two linear portions having predetermined slopes that correspond to the expected heat flow behavior. The steeper first slope is prepared for 1-D heat flow regions, and the shallower second slope is prepared for 2-D heat flow regions. This preliminary structuring ensures that when the curve is applied to actual thermal imaging data, the slope continuity at the junction is automatically achieved without requiring real-time complex calculations.
3Measurement precision
If traditional thermal imaging methods are used, then the process is straightforward, but accurate thickness measurement is difficult without separate reference standards or special coatings
Solution Approach 1:
The method uses the thermal response of the test object itself as the reference. By extracting the thermal response characteristics from the object being tested and using these to generate the reference curve, the system eliminates the need for separate reference standards or special coatings. The object's own thermal behavior provides the reference information needed for accurate thickness measurement, making the system self-sufficient.
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 approach enables precise measurement of object thickness with improved sensitivity and accuracy, accommodating non-uniform surfaces and varying emissivity, and is particularly effective for metals by using a synthetic thermal reference to compute contrast versus time data.
Implementation Method 1
the ingoing thermal pulse follows 1-D heat flow while the pulse returning from the flaw to the surface follows 2-D flow
Implementation Method 2
high-speed infrared transient thermography
Data Source
AI summary
A method including receiving a first line and a second line to be joined at a junction location to provide a reference curve. A corresponding system and computer program product.