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Quantitative Hyperspectral Imager

The SEPIA Quantitative Hyperspectral Imager is a novel scientific instrument dedicated to the objective analysis and condition monitoring of historic documents.

All major libraries and archives in the world are confronted with the challenging task of monitoring the condition of their valuable documents in a quantitative and efficient way. An objective risk assessment is of particular importance for documents displayed in exhibitions, where the environment can accelerate degradation processes in the materials.

The Nationaal Archief (National Archives of the Netherlands) have commissioned the SEPIA as a dedicated instrument for performing reproducible optical measurements of the condition of documents as the basis for an objective risk assessment.

The working principle and construction of the SEPIA Quantitative Hyperspectral Imager ensure that during data recording the stress for the analyzed document is kept to the absolute minimum.

Quantitative Hyperspectral Imager

  • Non-destructive spectral analysis
  • High spatial resolution of 4 million pixels
  • Calibrated reflectance and luminescence images
  • Accurate spectral reflectance curve for each pixel
  • Wavelength range 365 to 1160 nm (near-UV, VIS, NIR)

Advanced software for data management and multi-band image processing.


  • Calibrated reflectance spectral image
  • Calibrated fluorescence/luminescence spectral images
  • Spectral range 365 to 1160 nm
  • Reflectance bands 73
  • Luminescence bands   112 (extended mode: 390)
  • Spectral resolution FWHM 10 – 16 nm
  • Camera resolution 2048 x 2048 pixels (4 MP)
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