BRDF Measurement System Using Phase-Change Blackbody
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Solution Overview
Problem
Traditional BRDF measurement systems suffer from low measurement accuracy due to unstable light sources, limited detector fields of view, and inefficient single-wavelength scanning methods, which affect the accuracy and efficiency of reflectance characteristic measurements.
Innovation Solution
A BRDF measurement system comprising a blackbody that undergoes a solid-liquid phase change, a spectroradiometer, and a controller, where the spectroradiometer measures radiation from both the blackbody and the sample surface, using different fields of view and calibrating linearity to obtain accurate geometric and spectral relationships, thereby improving measurement accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional light source is used in BRDF measurement system, then the system structure is simple, but the measurement accuracy is low due to light source instability
Solution Approach 1:
The patent changes the physical state parameter of the blackbody from solid to liquid through phase transition, enabling it to maintain a stable temperature and emit consistent spectral radiance. This parameter change resolves the contradiction by providing measurement accuracy equivalent to expensive stable light sources while keeping the system structure relatively simple.
Solution Approach 2:
The patent uses a blackbody that can be easily replaced and does not require long-term stability maintenance like traditional light sources. The blackbody is heated to melting point and used temporarily during the measurement process, eliminating the need for complex stabilization mechanisms and reducing overall system complexity.
2Measurement precision
If a spectroradiometer with limited field of view is used, then the device complexity is reduced, but the measurement sensitivity and accuracy are limited
Solution Approach 1:
The patent employs dynamic adjustment of the spectroradiometer's field of view, switching between a first field of view for measuring the blackbody and a second field of view for measuring the sample. This dynamic configuration allows the system to achieve high measurement sensitivity without requiring a permanently complex multi-field-of-view device.
Solution Approach 2:
The measurement process is segmented into two distinct phases: first measuring the blackbody radiation with an optimized field of view, then measuring the sample reflection. This segmentation allows each measurement to use the most appropriate field of view configuration, achieving high sensitivity without permanently increasing device complexity.
3Productivity
If single-wavelength scanning method is used, then the device complexity is low, but the measurement efficiency is low
Solution Approach 1:
The patent implements continuous spectral measurement using the spectroradiometer to capture the entire spectral range in one operation rather than scanning wavelength by wavelength. This continuous measurement approach dramatically improves measurement efficiency while the system maintains relatively low complexity by using standard spectroradiometer capabilities.
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
The system significantly enhances BRDF measurement accuracy and efficiency by stabilizing the light source, increasing measurement sensitivity, and reducing measurement time, allowing for precise reflectance characteristic analysis.
Implementation Method 1
the blackbody is heated to a target temperature, it undergoes a solid-liquid phase change
Implementation Method 2
the spectroradiometer is used to measure the blackbody and transmit a first measurement signal to the controller, and in case that the blackbody irradiates a to-be-measured point on a sample surface, the spectroradiometer is further used to measure radiation from the to-be-measured point
Data Source
AI summary
A bidirectional reflectance distribution function (BRDF) measurement system and method, an electronic device, and a storage medium. The BRDF measurement system includes: a blackbody, a spectroradiometer and a controller; where in case that the blackbody is heated to a target temperature, it undergoes a solid-liquid phase change; the spectroradiometer is used to measure the blackbody and transmit a first measurement signal to the controller, and in case that the blackbody irradiates a to-be-measured point on a sample surface, the spectroradiometer is further used to measure radiation from the to-be-measured point, and transmit a second measurement signal to the controller; and the controller is used to obtain a BRDF of the to-be-measured point based on the first measurement signal, the second measurement signal, the target geometric relationship, a target mapping relationship and a dimension parameter of the blackbody.