Imaging Spectrometry for 3D Printing Temperature Measurement
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Solution Overview
Problem
Current temperature measurement methods for 3D printing processes are limited by the use of multiple cameras sensitive to different wavelengths, leading to inaccuracies due to spectral changes in emissivity.
Innovation Solution
The implementation of imaging spectrometry to measure blackbody radiation emitted during 3D printing, utilizing a pair of lenses, a field stop, and a wavelength separator to direct and analyze multiple wavelengths of radiation with an optical detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple cameras sensitive to different wavelengths are used for temperature measurement, then temperature measurement coverage is improved, but measurement precision deteriorates due to spectral changes in emissivity
Solution Approach 1:
The patent segments the spectral measurement into multiple discrete wavelength bands using bandpass filters, with each filter capturing a specific wavelength range. This segmentation allows the system to measure temperature across a broad spectrum while maintaining precision by analyzing the spectral distribution across multiple filtered channels rather than relying on a single wide-band measurement
Solution Approach 2:
The patent transitions from single-point or limited wavelength temperature measurement to multi-wavelength spectral measurement, adding the spectral dimension to the measurement. By capturing radiation intensity across multiple wavelength bands simultaneously, the system determines temperature through spectral analysis, which compensates for emissivity variations and improves measurement accuracy
2Device complexity
If a single camera with wide wavelength sensitivity is used, then device complexity is reduced, but measurement precision deteriorates due to inability to account for spectral changes in emissivity
Solution Approach 1:
The patent employs a rotating filter wheel that dynamically switches between multiple bandpass filters during measurement. This dynamic configuration allows a single camera to sequentially capture radiation at different wavelength bands, achieving multi-spectral measurement capability without requiring multiple fixed cameras, thus balancing device complexity with measurement precision
Solution Approach 2:
The rotating filter wheel implements periodic action by cycling through multiple wavelength-specific filters in sequence. Each filter position captures radiation for a specific duration, and the periodic rotation enables the single camera to gather spectral information across multiple wavelength bands over time, achieving accurate temperature measurement while maintaining relatively simple device architecture
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 method allows for accurate temperature determination of 3D printed components by analyzing the blackbody radiation, reducing errors associated with spectral changes in emissivity.
Implementation Method 1
measuring blackbody radiation before, during, or after 3D printing processes
Implementation Method 2
a wavelength separator configured to receive the light comprising the plurality of wavelengths from the second lens and to spatially separate the plurality of wavelengths
Data Source
AI summary
The problem of measuring the temperature of a 3D printing process is addressed by systems and methods that apply imaging spectrometry to measure blackbody radiation emitted before, during, or after a 3D printing process. The systems and methods utilize a pair of lenses, a field stop, and a wavelength separator to direct a plurality of wavelengths corresponding to the blackbody radiation to pixels of an optical detector. The plurality of wavelengths are analyzed by a controller to determine the temperature of the 3D printed component.