Multispectral Imaging Integrating Sphere Homogeneous Illumination
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Solution Overview
Problem
Conventional spectrophotometers face limitations in accurately measuring spectral reflectance of complex surfaces and cannot record image information, making them unsuitable for textiles and clothing samples, while existing multispectral color imaging devices suffer from non-homogeneous light distribution, poor stability, and low precision.
Innovation Solution
A multispectral color imaging device incorporating a light house module, integrating sphere module, and filter wheel module, along with an automatic calibration method using a reference reflective surface and background signal elimination techniques, to enhance measurement accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spectrophotometers are used for color measurement, then spectral reflectance can be accurately measured, but the device cannot record image information and is unsuitable for complex textured surfaces
Solution Approach 1:
The patent combines the spectral measurement capability of spectrophotometers with the imaging capability of multispectral imaging devices. The integrating sphere uniformly illuminates the sample while the camera captures spatial information, merging the advantages of both approaches to achieve accurate spectral reflectance measurement with image recording capability for complex textured surfaces
Solution Approach 2:
The patent introduces an integrating sphere as an intermediary component between the light source and the sample. The integrating sphere provides uniform diffuse illumination that eliminates directional lighting effects, enabling accurate measurement of complex textured surfaces while maintaining spectral measurement precision
2Adaptability or versatility
If existing multispectral color imaging devices are used, then image information can be recorded, but light distribution is not homogeneous and measurement precision is low
Solution Approach 1:
The integrating sphere serves as an intermediary that transforms direct light into uniform diffuse light before it reaches the sample. This eliminates the non-homogeneous light distribution problem in existing multispectral devices, ensuring that all areas of the sample receive equal illumination for accurate color measurement
Solution Approach 2:
The patent uses the integrating sphere to create homogeneous light distribution across the entire sample area. The multiple internal reflections within the sphere ensure that light intensity and spectral composition are uniform, eliminating measurement variations caused by non-homogeneous illumination
3Illumination intensity
If integrating spheres with high reflectivity inner walls are used, then light intensity is improved, but multiple reflections increase and adversely affect measurement accuracy
Solution Approach 1:
The patent optimizes the reflectivity parameter of the integrating sphere inner wall coating. By selecting appropriate reflectivity values and coating materials, the system achieves sufficient light intensity for accurate measurement while controlling the number of multiple reflections to minimize their adverse effects on measurement precision
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 device achieves improved accuracy and stability in color measurement by providing homogeneous illumination and precise data collection, effectively addressing the limitations of traditional methods.
Implementation Method 1
the light is uniformly reflected and diffused by the inner wall coating of the integrating sphere
Implementation Method 2
a light intensity collection device collects light radiated from the light source via reflection
Implementation Method 3
a filter wheel below the camera, and a lens below the filter wheel... one of the filters is configurable to position between the camera and the lens for filtering
Data Source
AI summary
The present invention provides a multispectral color imaging device, an automatic calibration method based on a reference reflective surface, and a method for eliminating background signals. A multispectral color imaging device including a light house module comprising a light source and a light intensity collection device surrounding the light source; an integrating sphere module including an integrating sphere, a light inlet on one side of the integrating sphere, a light outlet on the top of the integrating sphere, a sample holder gateway on the other side of the integrating sphere and a sample holder having access to the interior of the integrating sphere; and a filter wheel module including a camera, a filter wheel below the camera, and a lens below the filter wheel. The device and calibration methods of the present invention together improve the accuracy and stability of the measurement.