Wavelength-Selective Optical Filter with Spatially-Variant Downconverters
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Solution Overview
Problem
Current optical filters lack the capability to efficiently analyze and filter light across multiple spatially-variant areas for precise spectral data collection, which is essential for applications like multispectral 'liveness' detection and healthcare diagnostics.
Innovation Solution
The optical system incorporates a wavelength-selective optical filter with spatially-variant areas, including downconverters, that are in optical communication with photosensitive pixels, allowing for remote operation and flexible design to gather detailed optical data by varying the transmission spectra across different regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional optical filter is used, then the structure is simple, but the capability to analyze and filter light across multiple spatially-variant areas is lacking
Solution Approach 1:
The optical filter is divided into multiple spatially-variant areas, each with distinct transmission spectra characteristics. This segmentation allows different regions to filter and transmit specific wavelength ranges independently, enabling multi-spectral analysis capabilities while maintaining a single integrated filter structure
Solution Approach 2:
Different regions of the optical filter are assigned different optical properties and transmission spectra tailored to specific detection needs. Each spatially-variant area has customized optical characteristics optimized for particular wavelength ranges, allowing precise spectral data collection for different applications within the same device
2Adaptability or versatility
If the optical filter is disposed remotely from the optical sensor, then design flexibility is improved, but optical communication efficiency may be affected
Solution Approach 1:
The system transitions from requiring direct contact between filter and sensor to allowing remote positioning through optical communication paths. By utilizing optical pathways and potentially waveguide structures, the filter can be positioned at a distance while maintaining effective optical coupling, enabling flexible system design without sacrificing communication efficiency
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 configuration enables the system to effectively analyze and filter light across multiple areas, enhancing spectral data collection and providing valuable data for applications such as multispectral 'liveness' detection and healthcare diagnostics.
Implementation Method 1
A first plurality of spatially-variant areas can be disposed in the optical filter, at least one area of the first plurality of spatially-variant areas can include a downconverter
Data Source
AI summary
An optical system (150) is disclosed and includes an optical sensor (154), a plurality of photosensitive pixels (178) disposed on the optical sensor, a wavelength-selective optical filter (158) in optical communication with the photosensitive pixels, the wavelength-selective optical filter being disposed remotely from the optical sensor, and a plurality of spatially-variant areas (220, 224, 228, 232) disposed in the optical filter, at least one area of the plurality of spatially-variant areas including a downconverter (400, 500).