Using a fixed-frequency of oscillation in an FTS system to...

Details Using a fixed-frequency of oscillation in an FTS system to... Using a fixed-frequency of oscillation in an FTS system to...

2007-08-21

2007-08-21

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

By light interference

Spectroscopy

Reexamination Certificate

active

10959941

ABSTRACT:
A method for measuring scene inhomogeneity includes directing radiance of a scene into an interferometer; and oscillating a field-of-view (FOV) of the interferometer, while directing the radiance of the scene into the interferometer. A Fourier transform of signals emerging from the interferometer is obtained with magnitude values of the Fourier transform as a function of wavelength. The magnitude values are separated into (1) component values occurring within a predetermined wavelength band of the interferometer and (2) a component value occurring outside the predetermined wavelength band. The component value occurring outside the predetermined wavelength band is used to measure scene inhomogeneity.

REFERENCES:
patent: 5621526 (1997-04-01), Kuze
patent: 6297504 (2001-10-01), Andreou
Choongyeun Cho et al., “Stochastic Cloud Clearing of Hyperspectral Radiances Observed by the Atomspheric Infrared Sounder (AIRS) on the Aqua Satellite”, Massachusetts Institute of Technology, Research Laboratory Electronics (2004).
James B. Abshire et al., “Laser Sounder Approach Measuring Atomospheric CO2 from Orbit”, NASA Goddard Space Flight Center, pp. 1-6 (2003).

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