-
American Institute of Physics Conference Series; 06/2012
-
[show abstract]
[hide abstract]
ABSTRACT: Contiguous spectral measurements in the image domain made by the NASA Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) have been used to advance a range of Terrestrial Ecology science investigation over the past two decades. Currently there are hundreds of relevant refereed journal articles. The calibrated, high signal-to-noise ratio measurements of AVIRIS are used to investigate terrestrial ecology topics related to: (1) Pattern and Spatial Distribution of Ecosystems and their Components, (2) Ecosystem Function, Physiology and Seasonal Activity, (3) Biogeochemical Cycles, (3) Changes in Disturbance Activity, and (4) Ecosystems and Human Health.
Aerospace Conference, 2011 IEEE; 04/2011
-
[show abstract]
[hide abstract]
ABSTRACT: The Jet Propulsion Laboratory has developed the Hyperspectral Thermal Emission Spectrometer (HyTES).<sup>12</sup> It is an airborne pushbroom imaging spectrometer based on the Dyson optical configuration. First low altitude test flights are scheduled for later this year. HyTES uses a compact 7.5-12□m hyperspectral grating spectrometer in combination with a Quantum Well Infrared Photodetector (QWIP) and grating based spectrometer. The Dyson design allows for a very compact and optically fast system (F/1.6). Cooling requirements are minimized due to the single monolithic prism-like grating design. The configuration has the potential to be the optimal science-grade imaging spectroscopy solution for high altitude, lighter-than-air (HAA, LTA) vehicles and unmanned aerial vehicles (UAV) due to its small form factor and relatively low power requirements. The QWIP sensor allows for optimum spatial and spectral uniformity and provides adequate responsivity which allows for near 100mK noise equivalent temperature difference (NEDT) operation across the LWIR passband. The QWIP's repeatability and uniformity will be helpful for data integrity since currently an onboard calibrator is not planned. A calibration will be done before and after eight hour flights to gage any inconsistencies. This has been demonstrated with lab testing. Further test results show adequate NEDT, linearity as well as applicable earth science emissivity target results (Silicates, water) measured in direct sunlight.
Aerospace Conference, 2011 IEEE; 04/2011
