@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/badb0356-46e0-47b8-9697-0e068358c91e>
  ns0:altLabel [ ] ;
  skos:definition """A Far Infrared Sensor for Cirrus (FIRSC) is a a Fourier
transform spectrometer (FTS) configured as a Martin-Puplett
polarizing interferometer. In a Martin-Puplett configuration,
dihedral (roof-top) mirrors replace the usual flat mirrors of a
Michelson interferometer and a linear polarizing grid is the
beamsplitter. The instrument can operate in intensity or
polarization measuring mode. The Martin-Puplett configuration
provides two separate input and output ports defined by
reflection/transmission from input and output polarizer
elements. The measured spectrum is the difference of two input
ports consisting of the nadir scene and a controlled temperature
blackbody source. The two output ports provide the two spectral
channels.

Additional information available at
"http://nit.colorado.edu/~evans/mwcirrus/FIRSC/"

[Summary provided by the University of Colorado]"""@en ;
  skos:prefLabel "FIRSC"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/055a79c7-61db-4250-abad-f1e09909f14c> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/055a79c7-61db-4250-abad-f1e09909f14c>
  skos:prefLabel "Spectrometers"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/badb0356-46e0-47b8-9697-0e068358c91e> .