Thermal Imaging Screen Contamination Detection in Additive Manufacturing
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Solution Overview
Problem
Additive manufacturing techniques face challenges in accurately measuring working area temperatures due to factors like temperature reading drift, vapor condensation, dust accumulation, and electrical noise, leading to incomplete fusion or unwanted chemical changes, which can result in structurally unsound builds and safety hazards.
Innovation Solution
The method involves acquiring a thermal image of a reflector within the additive manufacturing apparatus using a thermally transmissive screen to identify temperature anomalies and determine the operational characteristics of the screen, allowing for feedback control and maintenance operations to ensure accurate temperature measurement and prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermally transmissive screen is used to protect the thermal imaging apparatus, then the apparatus is protected from contamination, but the screen itself becomes subject to contamination (dust accumulation, vapor condensation) which degrades temperature measurement accuracy
Solution Approach 1:
A reflector is introduced as an intermediary object between the thermal imaging apparatus and the screen. The reflector serves as a reference surface that reflects thermal radiation back through the screen to the detector, enabling indirect measurement of the screen's thermal transmission properties without direct line-of-sight contamination of the detector
Solution Approach 2:
The system uses the reflected thermal image from the reflector to provide feedback about the screen's condition. By analyzing the reflected thermal patterns, the system can detect contamination on the screen and adjust or correct temperature measurements accordingly, creating a closed-loop feedback mechanism for maintaining measurement accuracy
2Ease of operation
If temperature measurements are taken through the screen without correction, then the process is simple, but temperature reading drift occurs leading to incomplete fusion or unwanted chemical changes
Solution Approach 1:
The reflector is positioned and configured in advance to reflect thermal radiation from the build area back through the screen to the thermal imaging apparatus. This preliminary arrangement establishes a reference measurement path that accounts for screen-induced temperature reading drift before actual manufacturing measurements are taken
Solution Approach 2:
The system changes the measurement parameter by using reflected thermal radiation instead of direct thermal radiation. By measuring the reflected thermal image and analyzing its characteristics, the system can compensate for screen contamination effects and correct temperature readings to maintain fusion accuracy
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 temperature control and detection of contamination on the screen, reducing the risk of incomplete fusion and safety hazards, thereby improving the cohesion between layers and ensuring the structural integrity of the builds.
Implementation Method 1
acquiring a thermal image of a reflector within the additive manufacturing apparatus through a screen
Data Source
AI summary
In an example, a method includes acquiring a thermal image of a reflector within an additive manufacturing apparatus through a screen. An energy profile of the thermal image of the reflector may be determined and, based on the energy profile, an operational characteristic of the screen may be determined.