Multiple band short wave infrared mosaic array filter
View Patent ↗A camera system includes a mosaic optical color filter array, which includes a plurality of repeating unit cells that enforce spectral consistency and spatial uniformity. Each repeating unit cell of the plurality of repeating unit cells satisfies a minimum focal-plane array perimeter criterion and a minimum perimeter to area ratio criterion. The spatial arrangement of bands within the repeating unit cell minimizes inter-band correlation between nearest neighbors. The camera system further includes as short-wave infrared detector optically coupled to the mosaic optical color filter array. Optionally, the mosaic optical color filter array includes at least five spectral bands. The plurality of repeating unit cells includes the at least five spectral bands.
1. A device comprising:
a mosaic optical color filter array comprising a plurality of repeating unit cells that enforce spectral consistency and spatial uniformity, each repeating unit cell of the plurality of repeating unit cells satisfying a minimum focal-plane perimeter criterion and a minimum perimeter-to-area criterion, said minimum perimeter-to-area criterion being satisfied after said minimum focal-plane perimeter criterion; and
a short-wave infrared detector optically coupled to said mosaic optical color filter array,
wherein said mosaic optical color filter array comprises at least five spectral bands, said plurality of repeating unit cells comprising said at least five spectral bands,
wherein each spectral band of the at least five spectral bands comprises a plurality of spatial nearest neighbor and a plurality of spatial next-nearest neighbors, said each spectral band of the at least five spectral bands being located on the mosaic optical color filter array such that said each spectral band has a greater correlation with said plurality of spatial next-nearest neighbors than with said plurality of spatial nearest neighbors.
2. The device according to claim 1 , wherein said each spectral band of the at least five spectral bands is located on the mosaic optical color filter array such that the plurality of spatial nearest neighbors are spectrally nonadjacent.
3. The device according to claim 1 , wherein said at least five spectral bands comprise N spectral bands, said each repeating unit cell of said plurality of repeating unit cells comprising an M×P unit cell where M is a smallest integer at least equal to a square root of N and where P is a smallest integer at least equal to N/M.
4. The device according to claim 1 , wherein said each repeating unit cell of said plurality of repeating unit cells comprises at least one pixel for each spectral band of said at least five spectral bands.
5. The device according to claim 1 , wherein said mosaic optical color filter array is one of affixed to said short-wave infrared detector and located at a distance from said short-wave infrared detector.
6. The device according to claim 1 , wherein said short-wave infrared detector comprises one of a focal-plane array and a linear detector array.
7. The device according to claim 1 , wherein said at least five spectral bands are free from an effect of atmospheric absorption.
8. The device according to claim 1 , wherein said short-wave infrared detector is sensitive to light with wavelengths between 1100 and 1700 nm.
9. A device comprising:
a mosaic optical color filter array comprising a plurality of repeating unit cells that enforce spectral consistency and spatial uniformity, each repeating unit cell of the plurality of repeating unit cells satisfying a minimum focal-plane perimeter criterion and a minimum perimeter-to-area criterion, said minimum focal-plane perimeter-to-area criterion being satisfied after said minimum focal-plane perimeter criterion, said mosaic optical color filter array comprises at least six spectral bands, said plurality of repeating unit cells comprising said at least six spectral bands; and
a visible wavelength detector optically coupled to said mosaic optical color filter array,
wherein each spectral band of the at least six spectral bands comprises a plurality of spatial nearest neighbors and a plurality of spatial next-nearest neighbors, said each spectral band of the at least six spectral bands being located on the mosaic optical color filter array such that said each spectral band has a greater correlation with said plurality of spatial next-nearest neighbors than with said plurality of spatial nearest neighbors.
10. A device comprising:
a mosaic optical color filter array comprising a plurality of repeating unit cells that enforce spectral consistency and spatial uniformity, each repeating unit cell of the plurality of repeating unit cells satisfying a minimum nearest-neighbor inter-band correlation criterion, said mosaic optical color filter array comprises at least six spectral bands, said at least six spectral bands being spectrally distinct, said plurality of repeating unit cells comprising said at least six spectral bands; and
a visible wavelength detector optically coupled to said mosaic optical color filter array,
wherein each spectral band of the at least six spectral bands comprises a plurality of spatial nearest neighbors and a plurality of spatial next-nearest neighbors, said each spectral band of the at least six spectral bands minimizing adjacent spectral bands of the at least six spectral bands being placed as nearest neighbors spatially.