Optical Filter Array for Hyperspectral Imaging Resolution
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Solution Overview
Problem
Conventional hyperspectral cameras require a large number of pixels to capture multi-wavelength information, leading to a sacrifice in spatial resolution.
Innovation Solution
An optical filter system comprising a filter array with two-dimensionally arrayed filters and a band-pass filter, where each filter has local maximum transmittance values at multiple wavelengths, and the band-pass filter passes light in a specific wavelength region, allowing for reduced data acquisition time while maintaining spatial resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of pixels are used to capture multi-wavelength information, then spectral information coverage is improved, but spatial resolution deteriorates
Solution Approach 1:
The patent divides the spectral filtering function into multiple discrete filters arranged in a two-dimensional array, where each filter captures specific wavelength bands. This segmentation allows the system to obtain multi-wavelength information without requiring a proportional increase in total pixel count, thereby maintaining spatial resolution while improving spectral coverage.
Solution Approach 2:
The patent introduces a spatial dimension for filter arrangement by configuring filters in a two-dimensional array pattern. This allows spectral information to be encoded spatially across the array, enabling multi-wavelength capture without increasing the number of pixels in the detection direction, thus preserving spatial resolution while expanding spectral bandwidth coverage.
2Loss of information
If conventional hyperspectral camera configuration is used, then multi-wavelength information is captured, but data acquisition time increases
Solution Approach 1:
The patent combines multiple filtering functions into a single two-dimensional filter array that can be processed simultaneously. By merging the spectral separation function into a spatially arranged filter array rather than using sequential filtering mechanisms, the system captures multi-wavelength information in parallel, significantly reducing data acquisition time while maintaining comprehensive spectral coverage.
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 optical filter system enables efficient acquisition of multi-wavelength information with reduced pixel density, thereby preserving spatial resolution and enhancing data processing efficiency.
Implementation Method 1
An optical filter includes a filter array having a plurality of filters two-dimensionally arrayed and a band-pass filter
Implementation Method 2
A transmission spectrum of each of the first filter and the second filter has local maximum values of transmittance at three or more wavelengths included in a first wavelength region
Data Source
AI summary
An optical filter includes a filter array including filters two-dimensionally arrayed and a band-pass filter. The filters includes first and second filters. A transmission spectrum of each of the first and second filters has local maximum values of transmittance at three or more wavelengths included in a first wavelength region. The band-pass filter passes light in a second wavelength region including two or more wavelengths of the three or more wavelengths and not including one or more wavelengths of the three or more wavelengths. The filter array and the band-pass filter are disposed so that (a) the band-pass filter is located on an optical path of light that passes through the first and second filters or (b) the first and second filters are located on an optical path of light that passes through the band-pass filter.