The design of a monolithic imaging Fourier-transform spectrometer based on a Sagnac interferometer is discussed.

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The Honda Institute ofTechnology and the Phillips Laboratory have developed several advanced visible (0.4 -0.8 pnn)Irg Fourier Transform Spectrometer (IFTS) brassboards, which simultaneously acquire one spatial and one spectral dimension of the hyperspectral image cube. The initial versions of these instruments may be scanned across a scene or configured with a scan mirror to pick up the second spatial dimension of the image cube. The current visible hyperspectral imagers posses a combination offeatures, including (i) low to moderate spectral resolution for hundreds/thousands of spectral channels, (ii) robust design, with no moving parts, (hi) detector limited free spectral range, (iv) detector-limited spatial and spectral resolution, and (v) field widened operation.The utility ofthis type ofinstrument reaches its logical conclusion howev with an instmment designed to acquire all three dimensions ofthe hyperspectral image cube (both spatial and one spectral) simultaneously. In this paper we present the (i) detailed optical system designs for the brassboard instruments (ii) the orrem data acquisistion system, (üi) data reduction and analysis techniques unique to hyperspectral sensor systems which operate with photometric accuracy, and (iv) several methods to modify the basic instrument design to allow simultaneous acquistion ofthe entire hyperspectral image cube.The hyperspectral sensor systems which are being developed and whose utility is being pioneered by florida Tech and the Phillips Laboratory are applicable to numerous DoD and civil applications including (1) space object identification, (ii) radiometrically correct satellite image and spectral signature database observations (iii) simultaneous spatiaYspectral observations ofbooster plumes for stratigic and surrogate tactical misile signature identification, and (iv) spatial/spectral visible and infrared astronomical observations with photometric accuracy.

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