(imaging spectrometer using CT algorithm to sort out overlapping orders)
A CTIS, for computed tomographyimaging spectrometer
(or imaging spectrograph) is an imaging spectrometer which
records the spectrum without use of a slit, with the spectral
and spatial data blurred together, and multiple orders that
are overlapping. A data cube including a spectral energy distribution for
each pixel is produced by post processing using computed tomography
methods. This type of spectrometer is of interest for observing
the solarcorona, where photons are plentiful and the
challenge is capturing the data quickly and repeatedly in order to
follow the constant changes of solar events.