Instruments summary | NIRS | MIRS | FILM | FIRP

Far-Infrared Line Mapper (FILM)

The Far-Infrared Line Mapper (FILM) is a grating spectrometer designed to simultaneously measure (C II) 158 microns and (O I) 63 microns line intensities and continuum emission near the (C II) line with spatial resolution of 8 arcmin. Very high sensitivity and accuracy are achieved by using stressed and unstressed Ge: Ga detectors at 1.8 K with a helium cooled telescope and by using a spectral scanner to distinguish the line emission from the continuum emission. Line intensities of the (C II) and the (O I) will be mapped over 10% of the sky with much higher sensitivity than the previous survey measurements.


Size250 x 150 x 130 mm
Weight1950 g
Gratinga varied line-space cylindrically concave grating
Beam size (FWHM)8' (dispersion direction) x 13'
Area to be observed10-20% of the sky
Photograph of the FILM
Photograph of the FILM
Band Center (cm-1)64.463.462.4158.4
Resolving Power130409130405
Detectorsstressed Ge:Gastressed Ge:Gastressed Ge:GaGe:Ga
Optical through-put0.340.300.340.15
S (detector) (A/W) 0.51
System NEP (10-16 W/Hz1/2)1.80.601.712


For more details, refer to the following documents.

FILM Explanatory Supplement [PDF]

"Flight performance of the Far-Infrared Line Mapper (FILM)"
H. Shibai, T. Nakagawa, H. Okuda, S. Makiuti, H. Matsuhara, K. Okumura, N. Hiromoto, Y. Doi, and T. Tohya
1996, in SPIE Proc.2817, Infrared Spaceborne Remote Sensing IV ed. M. S. Scholl and B. F. Andresen, p.267-275 [ SPIE ] [ ADS ]
"Far-Infrared Line Mapper (FILM) on the Infrared Telescope in Space"
Hiroshi Shibai, Masao Yui, Hideo Matsuhara, Norihisa Hiromoto, Takao Nakagawa, and Haruyuki Okuda
1994, The Astrophysical Journal, vol.428, p.377-383 [ ADS ]

Last Modified: 20 July 2023