Multichannel Color Sensor with Compensation Channels for Spectral Shift
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Solution Overview
Problem
Radiation sensors, such as multi-spectral sensors, are susceptible to spectral shifts due to manufacturing process tolerances, which affect their accuracy in color sensing applications, particularly those requiring precise spectral sensitivity profiles like CIE XYZ color matching functions.
Innovation Solution
An integrated radiation sensor with a combination of color matching channels and compensation channels, each with specific spectral sensitivity profiles, is designed to compensate for manufacturing variations. The compensation channels have spectral sensitivity profiles that correspond to the mean of upper and lower deviation spectra, optimized to adhere to a Gaussian or Cosine shape, ensuring accurate color matching and spectral reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interference filters are used to define spectral sensitivity profiles, then color sensing accuracy is improved, but susceptibility to manufacturing tolerances increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-configuring compensation channels with specific spectral sensitivity profiles that counteract expected manufacturing tolerances. The compensation channels are designed in advance to offset potential deviations, so when manufacturing variations occur, the sensor automatically compensates without requiring post-manufacturing adjustment. This is achieved by configuring the compensation channels to have spectral sensitivity profiles that are deliberately offset from the nominal profiles, creating a built-in correction mechanism.
2Measurement precision
If multiple interference layers are deposited to enhance spectral filtering, then spectral sensitivity definition is improved, but manufacturing complexity increases
Solution Approach 1:
The patent introduces compensation channels as intermediary elements that mediate between the nominal spectral sensitivity profiles and the actual measured profiles. These compensation channels act as corrective intermediaries that capture the deviations caused by manufacturing tolerances and provide the necessary correction. The compensation channels are configured with spectral sensitivity profiles that correspond to the mean of upper and lower deviation spectra, effectively bridging the gap between ideal and actual sensor performance.
3Measurement precision
If spectral filters are optimized for specific color matching functions, then color sensing performance is improved, but adaptability to manufacturing variations deteriorates
Solution Approach 1:
The patent implements dynamics by creating a adaptive sensing system where the compensation channels dynamically adjust to manufacturing variations. The system maintains fixed nominal profiles for color matching functions while the compensation channels provide variable correction based on actual manufacturing deviations. This dynamic approach allows the sensor to adapt to different manufacturing tolerances while maintaining accurate color matching performance.
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 integrated radiation sensor effectively compensates for manufacturing process-related spectral deviations, achieving high accuracy in color matching and enabling detailed spectral reconstruction across the visible, ultraviolet, and infrared ranges, including precise detection of fluorescent light sources.
Implementation Method 1
spectral filters for the implementation of application-specific spectral sensitivity functions
Implementation Method 2
interference filters formed from multiple thin layers of dielectric material having different refractive indices
Data Source
AI summary
An integrated radiation sensor for color matching functions comprises a plurality of color matching channels, each color matching channel comprising a radiation sensing element and an associated optical filter defining a spectral sensitivity profile corresponding to a color matching function. The sensors comprise a plurality of compensation channels, each compensation channel comprising a radiation sensing element and an associated optical filter defining a spectral sensitivity profile for use in compensating a color sensed by the color matching channels. The spectral sensitivity profile of each compensation channel substantially corresponds to a mean of an upper deviation spectra and a lower deviation spectra, wherein the upper deviation spectra corresponds to a spectral sensitivity profile of a typical color matching channel increased by a fixed deviation in wavelength and the lower deviation spectra corresponds to the spectral sensitivity profile of the typical color matching channel decreased by the fixed deviation in wavelength.