PRIMA offers two versatile science instruments: The Far-Infrared Enhanced Survey Spectrometer (FIRESS), and the PRIMA Imager (PRIMAger). The PRIMA ETC calculates the exposure time required to reach a given line flux, continuum flux density, or survey depth for the science observing modes of PRIMA.
FIRESS offers full-band (24-235 micron) spectroscopy in two settings for three different observing modes. The ETC returns the time needed to complete one setting: Twice the time is needed to measure the spectrum across the full wavelength range. The low-resolution modes offers R~80-130 spectroscopy using either a point-source chop or a scan-map pattern over an area. The high-resolution mode is only offered for point sources and returns a R~2,000-20,000 spectrum, depending on wavelength.
PRIMAger offers simultaneous R~10 hyperspectral image mapping from 24-84 micron and 4-band polarimetric imaging at 80-261 micron (end-to-end of bandpasses). The hyperspectral mode is implemented using a linearly variable filter. The hyperspectral map and polarimetric image is obtained simultaneously, but of a different section of the sky. When mapping a sufficiently large area on the sky the full wavelength range will be covered concurrently.
