Projects
Projects
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4-D
MW/LW IR Hyperspectral Sensor Sponsor / Contract: US Air Force Project Term: October 2002 – October 2004 Problem: Present capabilities in the missile plume data collection are limited to imaging sensors (producing spatial image), or spectrometers (that produce a mean signature over an entire field of view with no spatial resolution). Even imaging spectrometer (or hyperspectral sensors) that have the potential to produce a data cube containing spatial/spectral information suffer from the fact that the cube acquisition process takes longer time than the temporal scale during which targets and plume change. Solution: 4D-IS concept with its ability to capture a full image cube at a single exposure or snap shot offers a new and enhanced capability over present sensors. Approach: Develop a dual band (mid-wave / long-wave) infrared
imaging spectrometer, capable of capturing simultaneously the 2-D spatial and
spectral contents of the scene in each snap shot (referred to as the 4
dimensional imaging spectrometer or 4D-IS).
The sensor is based on forming an image of the target onto input side of
a two-dimensional array of IR transmitting fiber optics.
The fibers are then rearranged into a linear array at the exit side of
the fiber bundle. This side then
serves as an entrance slit to an imaging spectrograph.
The data captured at the spectrograph focal plane must be reformatted to
produce multiple images of the target, each at one spectral band, hence
generation an “image cube” in a single snapshot. Payoff: Sensor capable of capturing hyperspectral images with good spatial,
temporal and spectral resolution.
OKSI’s 4-D Imaging Spectrometers utilize a 2-D to 1-D fiber optic reformatters allowing hyperspectral data to be generated from an entire scene with good temporal resolution |
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