Thermography for Machined Substrate Fragment Detection
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Solution Overview
Problem
Existing non-destructive thermography methods fail to detect machined substrate fragments within internal chambers of machined metal components, as these fragments are composed of the same material as the component and thus not distinguishable from the substrate using conventional thermography techniques.
Innovation Solution
A method and apparatus that apply heat to the outer surface of a machined metal component to create a temperature differential between the component and any machined substrate fragments within internal chambers, using infrared detection to identify heat elevation points indicative of fragment presence, even when fragments are made of the same material as the component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional thermography is used to detect subsurface defects, then defects with different material composition can be detected, but machined substrate fragments made of the same material as the component cannot be detected
Solution Approach 1:
The patent changes the detection parameter from material composition difference to thermal response difference. By applying transient thermal energy and measuring temperature changes over time, the system detects fragments based on their thermal properties (specific heat, thermal conductivity, mass) rather than material composition, enabling detection of same-material fragments
Solution Approach 2:
The patent uses transient thermal energy application (periodic heating pulses) followed by thermal response measurement. This periodic thermal excitation and measurement cycle allows differentiation of fragments from the component body based on their distinct thermal response characteristics over time
2Measurement precision
If heat is applied to detect thermal differences, then temperature differentials can be measured, but additional equipment and process complexity are required
Solution Approach 1:
The patent combines heating and detection functions into a single integrated system. The thermal energy source heats the component while the infrared camera simultaneously detects thermal responses, eliminating the need for separate heating apparatus and simplifying the overall detection system
Solution Approach 2:
The component itself serves as the heating medium by conducting thermal energy internally. The transient thermal diffusion through the component body naturally creates the temperature differentials needed for detection, eliminating the need for complex external heating mechanisms
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
Effectively detects machined substrate fragments within internal chambers by producing a thermal image that highlights temperature differences, ensuring the presence of fragments is identified even when they share material composition with the component, thereby preventing component malfunctions.
Implementation Method 1
applying heat to at least a section of the outer surface of the machined metal component... causing a fragment temperature elevation... and a component temperature elevation
Implementation Method 2
producing a thermal image of temperature distribution of the outer surface... detecting one or more heat elevation points within the thermal image
Data Source
AI summary
A method and apparatus for detecting machined substrate fragments by thermography. A heat source applies heat to a surface of machined component, the surface providing access to one or more internal chambers within an interior space of the component. The application of heat is sufficient in temperature and duration to cause a fragment temperature elevation rate in at least one machined substrate fragment present in at least one internal chamber that is greater than temperature elevation rate of the component. An IR detection device operably connected to a visual output device captures the IR signal from the component surface following the application of heat and outputs a thermal image of the component. Heat elevation points within the thermal image correspond with the presence of machined substrate fragments within at least one internal chamber of the component.