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SR-6500 Ultra High Resolution Spectroradiometer


The SR-6500 NIR spectroradiometer covers the UV/VIS/NIR range from 350-2500 nanometers. It features ultra-high resolution and very stable performance with three high density thermoelectrically cooled photodiode arrays. The SR-6500 is also calibrated to NIST-traceable radiometric calibration standards.

Resolution at FWHM for the SR6500 is:

  • 1.5nm @ 700nm
  • 3.0nm @ 1500nm
  • 3.8nm @ 2100nm

Resolution is achieved using three high density solid state thermoelectrically cooled photodiode arrays:


  • 1024 element TE-cooled silicon photodiode array detector (VIS-NIR)
  • 512 element TE-cooled InGaAs photodiode array detector (SWIR 1)
  • 512 element TE-cooled extended InGaAs photodiode array detector (SWIR 2)

The SR-6500 features the following Noise Equivalence Radiance (NER) performance with a 1.5 meter fiber optic:

  • 0.8×10-9 W/cm2/nm/sr @ 400nm
  • 0.3×10-9 W/cm2/nm/sr @ 1500nm
  • 5.8×10-9 W/cm2/nm/sr @ 2100nm

NER is a measure of instrument sensitivity. Other features of the SR-6500 include:

  • All fixed optics – no moving parts for rugged reliability
  • Auto-exposure, auto dark current shutter
  • DARWin SP Data Acquisition software saves all scans as ASCII files for use with

Specification of SR-6500  Spectroradiometer


Applications of SR-6500 Spectroradiometer

Mineral identification and analysis where resolution can help to distinguish
between minerals with very similar spectra or to unmix and identify minerals in trace amounts.
Soil studies for the identification of different soil characteristics, clay types,
presence or absence of nutrients and moisture.
Vegetation studies for plant stress/health, over-fertilization, species
identification and more.
Lab applications such as materials identification, etc.
Solar radiance and irradiance research.
Microbial diversity research