DUAL-BAND DIVIDED-APERTURE INFRA-RED SPECTRAL IMAGING SYSTEM
First Claim
1. An infrared (IR) imaging system for imaging a scene, the imaging system comprising:
- an optical system comprising an optical focal plane array (FPA) unit including a plurality of spatially and spectrally different optical channels to transfer IR radiation from the scene towards the optical FPA unit, each optical channel positioned to transfer a portion of the IR radiation incident on the optical system from the scene towards the optical FPA unit,wherein at least one of the plurality of optical channels is in the mid-wavelength infrared spectral range and at least another one of the plurality of optical channels is in the long-wavelength infrared spectral range,wherein the imaging system is configured to acquire a first video image of the scene in the mid-wavelength infrared spectral range and a second video image of the scene in the long-wavelength infrared spectral range.
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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. One of the at least two detector arrays comprises a cooled mid-wavelength infra-red FPA. 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.
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Citations
37 Claims
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1. An infrared (IR) imaging system for imaging a scene, the imaging system comprising:
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an optical system comprising an optical focal plane array (FPA) unit including a plurality of spatially and spectrally different optical channels to transfer IR radiation from the scene towards the optical FPA unit, each optical channel positioned to transfer a portion of the IR radiation incident on the optical system from the scene towards the optical FPA unit, wherein at least one of the plurality of optical channels is in the mid-wavelength infrared spectral range and at least another one of the plurality of optical channels is in the long-wavelength infrared spectral range, wherein the imaging system is configured to acquire a first video image of the scene in the mid-wavelength infrared spectral range and a second video image of the scene in the long-wavelength infrared spectral range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20-35. -35. (canceled)
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36. A method of detecting one or more chemical species in a scene, the method comprising:
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obtaining a first video image data of the scene in mid-wavelength infrared spectral range using a mid-wavelength infra-red FPA; obtaining a second video image data of the scene in long-wavelength infrared spectral range using a long-wavelength infra-red FPA; obtaining one or more spectra from the first and the second video image data; and comparing the obtained one or more spectra with one or more reference spectra stored in a database to detect one or more chemical species in the scene.
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37-42. -42. (canceled)
Specification