Infrared Camera System for Additive Manufacturing Defect Detection
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Solution Overview
Problem
Current additive manufacturing quality monitoring techniques using thermal imaging are limited in detecting defects like voids, cracks, and disbonds due to sensitivity issues and inaccuracies in temperature measurements, which can lead to errors in identifying improper build parameters or defects.
Innovation Solution
The use of an infrared camera system capturing spatial and temporal thermal responses during the additive manufacturing process, employing multiple synchronized cameras across different wavebands and image settings, along with image processing techniques like principal component analysis, to perform real-time inspection and nondestructive evaluation, enabling more sensitive detection of defects and improved defect contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If remote temperature measurements are used to monitor additive manufacturing quality, then the build quality can be determined and controlled, but the sensitivity and accuracy in detecting defects like voids, cracks, and disbonds are limited
Solution Approach 1:
The patent transitions from conventional 2D thermal imaging to 3D transient thermal response mapping by capturing temperature evolution over time at multiple spatial locations. This temporal dimension enables differentiation between normal thermal variations and actual defects, significantly improving detection sensitivity and identification accuracy simultaneously
Solution Approach 2:
The system monitors multiple thermal parameters including temperature, time derivative of temperature, and transient thermal response characteristics. By analyzing changes in these parameters over time rather than single-point measurements, the system achieves both high sensitivity to defect presence and accurate identification of defect types
2Measurement precision
If multiple synchronized cameras of different imaging wavebands are used to capture thermal response, then defect detection sensitivity and contrast are improved, but device complexity increases
Solution Approach 1:
The patent divides the thermal imaging task across multiple camera systems operating in different wavebands (infrared, visible, etc.), with each camera capturing specific thermal characteristics. This segmentation allows each sensor to be optimized for its wavelength range while collectively providing comprehensive defect detection capability
Solution Approach 2:
The multi-camera system serves multiple functions simultaneously: infrared cameras detect thermal anomalies, visible cameras capture structural context, and the synchronized multi-waveband data provides both sensitivity enhancement and defect characterization, reducing the need for separate inspection systems
3Manufacturing precision
If transient thermal response after solidification is captured for nondestructive evaluation, then deposition quality and structural integrity can be characterized, but measurement and processing complexity increases
Solution Approach 1:
The system captures transient thermal response data during the manufacturing process itself, before the part is completed. By recording the thermal evolution as material is deposited and solidifies in real-time, the system performs nondestructive evaluation during production rather than requiring separate post-processing inspection steps
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 allows for accurate detection of defects such as voids, cracks, and disbonds, enhancing the characterization of deposition quality and structural integrity, and enabling closed-loop control during the manufacturing process, resulting in improved build quality and reliability.
Implementation Method 1
an infrared camera system to capture the spatial and temporal thermal response during an additive manufacturing process
Implementation Method 2
Thermal imaging is used to monitor the quality of the build by measuring the temperature
Data Source
AI summary
Systems and methods are provided for the real time inspection of additive manufacturing deposits using infrared thermography. Various embodiments may enable the measurement of material properties and the detection of defects during the additive manufacturing process. Various embodiments may enable the characterization of deposition quality, as well as the detection of deposition defects, such as voids, cracks, disbonds, etc., as a structure is manufactured layer by layer in an additive manufacturing process. Various embodiments may enable quantitative inspection images to be archived and associated with the manufactured structure to document the manufactured structure's structural integrity.