Birefringent Fourier-transform imaging spectrometer

Birefringent Fourier-transform imaging spectrometer.

Fourier-transform imaging spectrometers offer important advantages over other spectral imaging modalities, such as, a wider free spectral range, higher spectral resolutions and, in low-photon-flux conditions, higher signal-to-noise ratios can be achieved. Unfortunately, for application in harsh environments, deployment of Fourier-transform instruments based on traditional moving-mirror interfer...

Calibration of the Geostationary Imaging Fourier Transform Spectrometer (GIFTS)

The NASA New Millennium Program’s Geostationary Imaging Fourier Transform Spectrometer (GIFTS) requires highly accurate radiometric and spectral calibration in order to carry out its mission to provide water vapor, wind, temperature, and trace gas profiling from geostationary orbit. A calibration concept has been developed for the GIFTS Phase A instrument design. The in-flight calibration is pe...

Fourier Transform Based Hyperspectral Imaging

A hyperspectral imaging system (HSIS) is a combination of an imaging device and a spectrometer. The result is a 2D image combined with the third dimension containing the spectral composition of each pixel of the image. Spectrometers normally implemented in hyperspectral imaging systems are made by integrating a dispersive means (a prism or a grating) in an optical system, with the drawback of h...

Imaging Fourier-transform spectrometer measurements of a turbulent nonpremixed jet flame.

This work presents recent measurements of a CH4/H2/N2 turbulent nonpremixed jet flame using an imaging Fourier-transform spectrometer (IFTS). Spatially resolved (128×192 pixels, 0.72  mm/pixel) mean radiance spectra were collected between 1800  cm(-1)≤ν˜≤4500  cm(-1) (2.22  μm≤λ≤5.55  μm) at moderate spectral resolution (δν=16  cm(-1), δλ=20  nm) spanning the visible flame. Higher spectral-reso...

Processing data from the SPIRE imaging Fourier transform spectrometer SPIRE - BSS - NOT - 002664 Blue Sky Spectroscopy