Article ID Journal Published Year Pages File Type
1784559 Infrared Physics & Technology 2013 6 Pages PDF
Abstract

Is a quantum well infrared photodetector (QWIP) suitable for hyperspectral applications? Yes, provided its spectral response is broad enough, the signal-to-noise ratio in narrow spectral slices across the entire response band is high enough, and the operating temperature is reasonable. We present the performance of a 640 × 512 QWIP focal plane array (FPA) with nearly uniform spectral response from 8 to 12 μm that achieves temporal noise equivalent temperature difference (NETD) lower than 200 mK in 20 nm wide spectral slices across the entire 8–12 μm band with the FPA operating at a temperature of 50 K or colder. A hyperspectral camera would feature a grating or prism to disperse 8–12 μm light across such a FPA or a hyperspectral filter on top of the FPA. Operating in pushbroom mode on an earth-observing satellite, the camera can be used for spectral mapping of vegetation, crops and forests, for pollution monitoring, and for studies in atmospheric chemistry.

Related Topics
Physical Sciences and Engineering Physics and Astronomy Atomic and Molecular Physics, and Optics
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