Focal Plane Instruments (FPI) of the IRTS

There were 4 instruments at the focus of the IRTS telesocpe.

FPI side view FPI bottom view

Focal Plane Instruments of the IRTS

NIRS (Near Infrared Spectrometer)

The NIRS is a grating spectrometer with two 12 element InSb linear arrays. The wavelength coverage ranges from1.4 micron to 4.0 micron with a spectral resolution of 0.12 micron. The field of view is 8 arcmin X 8 arcmin. The paper titled "Near-infrared spectrometer on the Infrared Telescope in Space", by Noda, Manabu et al, 1994, describes this instrument in detail [1994ApJ...428..363N].

MIRS(Mid Infrared Spectrometer)

The MIRS is also a grating spectrometer with 32 Si:Bi photoconductors. The wavelength coverage ranges from 4.5 micron to 11.7 micron, with a spectral resolution of 0.23 to 0.36 micron. The field of view is 8 arcmin X 8 arcmin. The paper titled "The Mid-Infrared Spectrometer on the Infrared Telescope in Space (IRTS) mission", by Roellig, Thomas L. et al, 1994, describes this instrument in detail [1994ApJ...428..370R].

FILM (Far-Infrared Line Mapper)

The FILM is a grating spectrometer designed to simultaneously measure [CII] 158 micron line and [OI] 63 micron line intensities and cotinuum emission near the [CII] line with spatial resolution of 13 arcmin X 8 arcmin. The detectors are unstressed and stressed Ge:Ga photoconductors. The paper titled "Far-Infrared Line Mapper (FILM) on the Infrared Telescope in Space", by Shibai, Hiroshi et al, 1994, describes this instrument in detail [1994ApJ...428..377S].

A synopsis of the FILM 155 micron data can be found here; and on the FILM CII data can be found here.

Additional notes on FILM by Steve Lord, an IRSA Scientist, are available here to help users.