Divided-aperture infra-red spectral imaging system
First Claim
1. An infrared (IR) imaging system, the imaging system comprising:
- an optical system including an optical focal plane array (FPA) unit, the optical system comprising components associated with at least two optical channels spatially and spectrally different from one another, each of the at least two optical channels positioned to transfer IR radiation from an object incident on the optical system towards the optical FPA unit, the optical FPA unit comprising at least two detectors disposed at a distance from two corresponding focusing lenses; and
a data-processing unit configured to obtain a spectral difference image by comparing images obtained by the at least two detectors, said infrared imaging system configured to identify a target species based on said spectral difference image.
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Abstract
Various embodiments disclosed herein describe a divided-aperture infrared spectral imaging (DAISI) system that is adapted to acquire multiple IR images of a scene with a single-shot (also referred to as a snapshot). The plurality of acquired images having different wavelength compositions that are obtained generally simultaneously. The system includes at least two optical channels that are spatially and spectrally different from one another. Each of the at least two optical channels are configured to transfer IR radiation incident on the optical system towards an optical FPA unit comprising at least two detector arrays disposed in the focal plane of two corresponding focusing lenses. The system further comprises at least one temperature reference source or surface that is used to dynamically calibrate the two detector arrays and compensate for a temperature difference between the two detector arrays.
163 Citations
16 Claims
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1. An infrared (IR) imaging system, the imaging system comprising:
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an optical system including an optical focal plane array (FPA) unit, the optical system comprising components associated with at least two optical channels spatially and spectrally different from one another, each of the at least two optical channels positioned to transfer IR radiation from an object incident on the optical system towards the optical FPA unit, the optical FPA unit comprising at least two detectors disposed at a distance from two corresponding focusing lenses; and a data-processing unit configured to obtain a spectral difference image by comparing images obtained by the at least two detectors, said infrared imaging system configured to identify a target species based on said spectral difference image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification