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

<https://gcmd.earthdata.nasa.gov/kms/concept/8143e95e-a438-4a2a-82b2-6d7ae079fba7>
  skos:prefLabel "Photon/Optical Detectors"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/4feec751-591b-4735-a8ca-e49a15dda0c4> .

<https://gcmd.earthdata.nasa.gov/kms/concept/4feec751-591b-4735-a8ca-e49a15dda0c4>
  ns0:altLabel [ ] ;
  skos:definition """USIM, or Underwater Spectral Irradiance Meter, is used in the study of the photosynthetic rate of phyto-plankton and to measure the quantity of radiant light energy available for photosynthesis, specifically direct measurements of the subsurface radiation. This instrument was designed to measure the total amount of
light falling at a fixed point in the sea over a period of time.

References:

Draper, L., 1961, Self-contained integrating irradiance meter for use underwater.  Journal of Scientific Instruments. 38, 474-476. 


Group: Instrument_Details
   Entry_ID: USIM
   Group: Instrument_Identification
      Instrument_Category: In Situ/Laboratory Instruments
      Instrument_Class: Photon/Optical Detectors
      Short_Name: USIM
      Long_Name: Underwater Spectral Irradiance Meter
   End_Group
   Online_Resource: http://www.iop.org/EJ/article/0950-7671/38/12/307/siv38i12p474.pdf?request-id=be9c3e08-86e5-4f2f-8751-e2d9cfe3831e
   Creation_Date: 2008-07-18
End_Group"""@en ;
  skos:prefLabel "USIM"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/8143e95e-a438-4a2a-82b2-6d7ae079fba7> ;
  a skos:Concept .