Structured Coded Aperture Fiber Bundles
First Claim
1. A method of spatially filtering light radiating from a sample, the method comprising:
- collecting light radiating from the sample with an input end of a fiber bundle comprising a plurality of optical fibers; and
spatially filtering the collected light by outputting the collected light from an output end of the fiber bundle, wherein the plurality of fibers at the output end are arranged according to a two-dimensional pattern corresponding to a pre-determined coded aperture function.
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Abstract
A spatial filter for an optical system, such as an optical spectrometer, collects and spatially filters light using a fiber bundle having a plurality of fibers disposed therein. At an input end of the fiber bundle, the fibers are typically packed tightly together to optimize the collection efficiency. At an output end, the fibers are spread out from the fiber bundle and arranged within a two-dimensional output area according to a two-dimensional pattern corresponding to a coded aperture function. As a result, the two-dimensional pattern of the output end spatially filters the light collected by the input end. Corresponding methods are also described.
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Citations
48 Claims
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1. A method of spatially filtering light radiating from a sample, the method comprising:
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collecting light radiating from the sample with an input end of a fiber bundle comprising a plurality of optical fibers; and spatially filtering the collected light by outputting the collected light from an output end of the fiber bundle, wherein the plurality of fibers at the output end are arranged according to a two-dimensional pattern corresponding to a pre-determined coded aperture function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of manufacturing a spatial filter comprising:
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positioning a plurality of optical fibers at a first end of a fiber bundle according to a two-dimensional pattern occupying a first area and corresponding to a pre-determined coded aperture function; affixing the plurality of optical fibers in the two-dimensional pattern; and packing a plurality of fibers at a second end of the fiber bundle, opposite the first end, into a second area smaller than the first area. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An optical spatial filter comprising:
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a fiber bundle comprising a plurality of optical fibers; wherein said plurality of optical fibers are positioned at an output end of the fiber bundle according to a two-dimensional pattern occupying a first area and corresponding to a pre-determined coded aperture function; and wherein said plurality of optical fibers at an input end of the fiber bundle, opposite said output end, are packed into a second area smaller than the first area. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. An optical spectrometer comprising:
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a collection filter system configured to collect incident light radiating from a sample and spatially filter the collected light according to a pre-determined coded aperture function, the collection filter system comprising; a fiber bundle comprising a plurality of optical fibers; wherein said plurality of optical fibers are positioned at an output end of the fiber bundle according to a two-dimensional pattern occupying a first area and corresponding to the pre-determined coded aperture function; and wherein said plurality of optical fibers at an input end of the fiber bundle, opposite said output end, are packed into a second area smaller than the first area; a two-dimensional detector array; and a dispersion system disposed between the collection filter system and the detector array, said dispersion system configured to shift images of the two-dimensional pattern in a wavelength dependent fashion onto the detector array. - View Dependent Claims (35, 36, 37, 38, 39, 40)
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41. A method of processing light comprising:
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collecting light radiating from a sample with an input end of a fiber bundle comprising a plurality of optical fibers; spatially filtering the collected light by outputting the collected light from an output end of the fiber bundle, wherein the plurality of fibers at the output end are arranged according to a two-dimensional pattern corresponding to a pre-determined coded aperture function; dispersing the filtered light to shift images of the two-dimensional pattern in a wavelength dependent fashion onto a two-dimensional detector array; and processing one or more output signals corresponding to one or more detected images to identify one or more spectral characteristics of the light. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48)
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Specification