Terahertz Surface Inspection System for Subsurface Feature Detection
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Solution Overview
Problem
Conventional surface inspection methods face challenges in detecting degradation beneath surface layers such as sealants, adhesives, or coatings, as these layers obscure underlying corrosion, cracks, and other degradations, requiring costly and time-consuming removal processes.
Innovation Solution
A terahertz-based system that emits energy towards a surface with a surface layer, using a detector to receive reflected energy and a computing device to analyze the signals for identifying surface features and degradation, allowing for non-destructive inspection without removing the surface layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface layers (sealants, adhesives, coatings) are removed to inspect underlying surface, then detection accuracy is improved, but inspection time and cost increase significantly
Solution Approach 1:
The patent uses terahertz radiation as an intermediary that can penetrate surface layers (sealants, adhesives, coatings) to directly inspect the underlying surface. This mediator enables detection without physical removal of protective layers, resolving the contradiction between maintaining surface integrity and achieving accurate subsurface inspection.
Solution Approach 2:
The invention replaces mechanical/chemical surface layer removal processes with terahertz electromagnetic radiation for non-destructive inspection. This substitution eliminates the need for manual labor, potent chemicals, and subsequent reapplication, thereby reducing both time and cost while maintaining detection accuracy.
2Difficulty of detecting and measuring
If surface layers are removed through chemical or manual methods, then access to underlying surface is achieved, but additional reapplication cost and time are incurred
Solution Approach 1:
Terahertz radiation serves as a non-invasive intermediary that penetrates surface layers to enable inspection without removal. This approach maintains the protective surface layers intact, eliminating all costs and time associated with their removal and reapplication while providing full access to the underlying surface for inspection purposes.
Solution Approach 2:
The inspection system allows the surface layers to remain in their protective function while simultaneously enabling inspection through them. The layers essentially 'serve themselves' by both protecting the underlying surface and allowing terahertz penetration, eliminating the need for their removal and reapplication.
3Loss of information
If conventional inspection methods are used, then surface features are visible, but degradation beneath surface layers cannot be detected
Solution Approach 1:
Terahertz radiation acts as an intermediary that penetrates surface layers to reveal subsurface degradation while maintaining visibility of surface features. This dual capability resolves the information loss by providing both surface and subsurface inspection capabilities simultaneously through the same radiation medium.
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 of surface features and degradation through terahertz energy analysis, facilitating non-destructive inspection and potentially allowing for subsequent repair operations without the need for surface layer removal.
Implementation Method 1
a terahertz emitter orientable to emit energy toward a surface
Implementation Method 2
a detector positionable to receive terahertz energy from the terahertz emitter that is reflected by the surface
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
An apparatus for surface inspection comprises a terahertz emitter, a detector, and a computing device. The terahertz emitter is oriented to emit energy toward a surface having a surface layer disposed on the surface in a proximity of a surface feature. The detector is positioned to receive the energy from the terahertz emitter that is reflected by the surface. The computing device is in signal communication with the detector and is configured to detect the surface feature using a signal from the detector.