Hyperspectral imaging systems
First Claim
Patent Images
1. A hyperspectral imaging system, comprising:
- a focal plane array;
a grating-free spectrometer, having one or both of a lenslet array and an aperture array, for first dividing a field of view into multiple channels and for then reimaging each of the multiple channels as a spectral signature onto the focal plane array;
first optics, to collimate electromagnetic energy of the multiple channels;
a prism, to disperse the electromagnetic energy of the multiple channels into the spectral signatures;
second optics to image the spectral signatures onto the focal plane array; and
a processor connected with the focal plane array for forming a hyperspectral data cube from the spectral signatures, wherein objects may be identified from the hyperspectral data cube.
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Abstract
Hyperspectral imaging systems that may be used for imaging objects in three-dimensions with no moving parts are disclosed. A lenslet array and/or a pinhole array may be used to reimage and divide the field of view into multiple channels. The multiple channels are dispersed into multiple spectral signatures and observed on a two-dimensional focal plane array in real time. The entire hyperspectral datacube is collected simultaneously.
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Citations
25 Claims
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1. A hyperspectral imaging system, comprising:
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a focal plane array; a grating-free spectrometer, having one or both of a lenslet array and an aperture array, for first dividing a field of view into multiple channels and for then reimaging each of the multiple channels as a spectral signature onto the focal plane array; first optics, to collimate electromagnetic energy of the multiple channels; a prism, to disperse the electromagnetic energy of the multiple channels into the spectral signatures; second optics to image the spectral signatures onto the focal plane array; and a processor connected with the focal plane array for forming a hyperspectral data cube from the spectral signatures, wherein objects may be identified from the hyperspectral data cube. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A hyperspectral imaging system, comprising:
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imaging optics for forming an image of an object; an image slicer for partitioning a field of view of the imaging optics; and
, for each partitioned part of the field of view;a focal plane array; a spectrometer for first dividing its field of view into multiple channels and for then reimaging each of the multiple channels as a spectral signature onto the focal plane array, the spectrometer including one or both of an array of apertures and an array of lenslets and further comprising; first optics, to collimate electromagnetic energy of the multiple channels; a prism, to disperse the electromagnetic energy of the multiple channels into the spectral signatures; and second optics to image the spectral signatures onto the focal plane array; and a processor connected with the focal plane array for forming a hyperspectral data cube from the spectral signatures, wherein objects may be identified from the hyperspectral data cube. - View Dependent Claims (17, 18, 19, 20)
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21. A multiwavelength imager, comprising:
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imaging optics for forming an image of an object; a focal plane array; at least one micromachined optical element (MMO) located at or near to an image plane of the imaging optics, for providing a spectral signature for use with the focal plane array, the at least one MMO including (a) a lenslet array and (b) Fresnel optics, to image an entrance pupil of the imaging optics and to divide it into wavelengths; an assembly wheel for positioning multiple MMOs within the imager wherein selection of any one MMO provides differing spectral signatures from any other MMO of the assembly wheel; and a processor connected with the focal plane array for forming a hyperspectral data cube from the spectral signatures, wherein objects may be identified from the hyperspectral data cube. - View Dependent Claims (22, 23)
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24. A hyperspectral imaging system, comprising:
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imaging optics for forming an image of an object; a focal plane array; a spectrometer having an array of apertures that first divide a field of view of the imaging optics into multiple channels and dispersive optics for then reimaging each of the multiple channels as a spectral signature onto the focal plane array, the spectrometer further comprising; first optics, to collimate electromagnetic energy of the multiple channels; a prism, to disperse the electromagnetic energy of the multiple channels into the spectral signatures; and second optics to image the spectral signatures onto the focal plane array; and a processor connected with the focal plane array for forming a hyperspectral data cube from the spectral signatures, wherein objects may be identified from the hyperspectral data cube.
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25. A hyperspectral imaging system, comprising:
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a lenslet array; a focal plane array; an aperture array between the detector array and the lenslet array, the aperture array having a different pitch than the lenslet array, the lenslet array moveable to define where an object is viewed by the imaging system, wherein each lenslet of the lenslet array is aligned with a corresponding aperture of the aperture array; a grating-free spectrometer for reimaging multiple channels from the lenslet array as multiple spectral signatures onto the detector array; first optics, to collimate electromagnetic energy of the multiple channels; a prism, to disperse the electromagnetic energy of the multiple channels into the spectral signatures; second optics to image the spectral signatures onto the focal plane array; and a processor connected with the focal plane array for forming a hyperspectral data cube from the spectral signatures, wherein objects may be identified from the hyperspectral data cube.
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Specification