ON-CHIP SPECTRAL FILTERING USING CCD ARRAY FOR IMAGING AND SPECTROSCOPY
First Claim
1. A spectral filter, comprising:
- a photosensitive array having a plurality of photosensitive elements, at least a subsection of photosensitive elements of said array along one direction thereof being configured such that each element of said subsection along said one direction receives light of a different wavelength range of a characteristic spectrum and produces an electrical signal corresponding thereto, said subsection being configured to combine signals of at least two photosensitive elements and to output said combined signal as a measure of the optical energy within a bandwidth of interest of said characteristic spectrum.
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Abstract
A spectral filtering apparatus and method is presented, which enables the functions of hyperspectral imaging to be performed with increased speed, simplicity, and performance that are required for commercial products. The apparatus includes a photosensitive array having a plurality of photosensitive elements such that different subsections of photosensitive elements of the array receive light of a different wavelength range of a characteristic spectrum of a target, and output electronics combines signals of at least two photosensitive elements in a subsection of the array and outputs the combined signal as a measure of the optical energy within a bandwidth of interest of the characteristic spectrum.
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Citations
26 Claims
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1. A spectral filter, comprising:
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a photosensitive array having a plurality of photosensitive elements, at least a subsection of photosensitive elements of said array along one direction thereof being configured such that each element of said subsection along said one direction receives light of a different wavelength range of a characteristic spectrum and produces an electrical signal corresponding thereto, said subsection being configured to combine signals of at least two photosensitive elements and to output said combined signal as a measure of the optical energy within a bandwidth of interest of said characteristic spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for spectral imaging of a target, comprising:
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a photosensitive array having a plurality of photosensitive elements;
an illumination source for excitation of said target;
imaging optics that focuses and spreads light emitted from said target in response to excitation from said illumination source over said photosensitive array, such that different subsections of photosensitive elements of said array receive light of a different wavelength range of a characteristic spectrum of said target; and
output electronics coupled to said photosensitive array and receiving electrical signals from said photosensitive elements, combining signals of at least two photosensitive elements in a subsection and outputting said combined signal as a measure of the optical energy within a bandwidth of interest of said characteristic spectrum. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of performing spectral filtering using a photosensitive array having a plurality of photosensitive elements, comprising the steps of:
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calibrating said array such that each element of said photosensitive array along one direction thereof corresponds to a different wavelength range of a characteristic spectrum projected onto said array;
configuring a read-out process of said array to combine signals of at least two photosensitive elements along said one direction, generated in response to illumination by said characteristic spectrum, as a measure of the optical energy within a bandwidth of interest of said spectrum. - View Dependent Claims (23, 24, 25, 26)
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Specification