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spectrograph comparison table
Subject has acronym has definition
diffraction grating spectrograph  
Fourier Transform SpectrometerFTS 
imaging spectrometer Class of instruments which preserve the image field while also determining the spectrum. Integral Field Unit (IFU). Usually implies some kind of image slicing either with facets or fiber optics.
NICMOS Near Infrared Camera for Multi-Object Spectrography.
spectroheliograph Device with which spectra of the various regions of the Sun are obtained and photographed.
UVES Ultraviolet Echelle Spectrograph.

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