BRDF Measurement Device Using Multi-Spectrograph Goniometer
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Solution Overview
Problem
Current methods for measuring the bi-directional reflectance distribution function (BRDF) of objects in ground-based settings are time-consuming and prone to systemic and random errors due to reliance on robotic manipulators or handheld cameras.
Innovation Solution
A method and device involving multiple spectrographs positioned around a turntable with a fixed light source, allowing for the capture of reflectance spectra at various orientations of the object, which are then analyzed to calculate the BRDF, utilizing a computer program product to automate the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If robotic manipulators or handheld cameras are used to measure BRDF, then measurement can be performed, but the process becomes time-consuming and introduces systemic and random errors
Solution Approach 1:
The patent replaces mechanical robotic manipulators and handheld camera systems with an automated optical measurement system using spectrographs mounted on a goniometer. This substitution eliminates the time-consuming manual positioning and mechanical manipulation inherent in previous methods, while simultaneously reducing systemic errors through precise optical alignment and automated data collection across multiple angles.
Solution Approach 2:
The measurement system is segmented into multiple spectrographs positioned at different fixed angles around the sample. This segmentation allows parallel data collection from multiple viewing angles simultaneously, dramatically reducing the total measurement time compared to sequential single-camera approaches, while maintaining high precision through each spectrograph's dedicated optical path.
2Productivity
If robotic manipulators or handheld cameras are used to measure BRDF, then measurement can be performed, but systemic and random errors are introduced
Solution Approach 1:
The patent replaces mechanical robotic manipulators and handheld camera systems with an automated optical measurement system using spectrographs mounted on a goniometer. This substitution eliminates the time-consuming manual positioning and mechanical manipulation inherent in previous methods, while simultaneously reducing systemic errors through precise optical alignment and automated data collection across multiple angles.
Solution Approach 2:
The measurement system is self-aligning through the fixed geometric relationships between the spectrographs and the goniometer rotation axis. The system automatically collects data at predetermined angles without requiring manual intervention for positioning or alignment, ensuring consistent, repeatable measurements that eliminate operator-induced variability and improve reliability.
3Measurement precision
If multiple spectrographs are positioned at different elevation angles to capture reflectance spectra, then BRDF measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The goniometer serves as a universal mounting platform that accommodates multiple spectrographs at different fixed elevation angles. This single rotating mechanism provides both the sample rotation capability and the multi-angle viewing capability, eliminating the need for separate positioning systems for each spectrograph and reducing overall device complexity despite the multiple sensors.
Solution Approach 2:
The patent merges the sample rotation function with the multi-angle observation function into a single integrated goniometer system. The spectrographs are fixed to the goniometer structure at predetermined angles, combining what would otherwise be separate subsystems into one cohesive unit that reduces mechanical complexity while maintaining the ability to capture reflectance spectra at multiple angles for accurate BRDF measurement.
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 provides more accurate and efficient measurement of BRDF by minimizing errors and reducing the time required for data capture, enabling improved identification and classification of orbital debris.
Implementation Method 1
a light source is used to illuminate the object and each of the spectrographs captures a reflectance spectra reflected from the object
Data Source
AI summary
Methods, computer program products, and corresponding devices are provided for measuring the bi-directional reflectance distribution function (BRDF) of an object. An object is positioned relative to a BRDF measurement device. The BRDF measurement device comprises a turntable coupled to a background and a light source, the turntable configured to have the object positioned thereon; and a plurality of spectrographs configured such that each of the plurality of the spectrographs captures a reflectance spectra associated with the object from a different elevation angle relative to the object. A set of spectra data is captured by illuminating the object with the light source; and with each spectrograph, capturing a reflectance spectra associated with the object. The turntable is rotated such that an azimuthal angle between the object and the light source is changed. The capturing and rotating steps are repeated for a predetermined set of azimuthal angles.