Via the understanding of light propagation in the scattering medium to calibration-free spectroscopy

In standard UV/VIS/NIR spectroscopy, one is faced with the problem that the light reflected from the medium under investigation is simultaneously influenced by - essentially - two physical effects, light scattering and absorption. Complex calibration procedures are therefore necessary to quantify the constituents. In recent years, methods have been developed at the ILM which, based on solutions of the radiative transfer equation, allow calibration-free VIS/NIR spectroscopy for the quantification of the constituents in turbid media. Recently, these methods have been translated into sensor technology suitable for industrial use, see figure.

VIS NIR spectroscopy
VIS NIR spectroscopy


  • Quantitative spectroscopy for scattering media
  • Avoidance of time-consuming calibration measurements
  • Change in the microstructure of the medium is methodically recorded
  • Industrial prototype available

Our offer:

  • Order measurements of your samples:
    • Analysis of your problem for applicability of the method
  • Determination of the measuring range for the respective component
  • Measurement of your starting materials
  • Method development:
    • Development of the measurement methodology for your problem
    • Industrial prototype available
    • Analysis of the expected accuracy of the determination of the individual parameters
  • Manufacture of sensor technology in small series

Areas of application:

  • Material analysis
  • Biophotonics
  • Content determination of ingredients
  • Quality assurance
  • Food analysis
  • Pharmacy and cosmetics
  • Prototype especially suitable for liquid or pasty products



Dr. Florian Foschum

Group Leader Calibration-Free Sensors

Tel: +49 (0)731 / 1429 779
Prof. Dr. Alwin Kienle

Prof. Dr. Alwin Kienle

Director Materials Optics & Imaging

Tel: +49 (0)731 / 1429 224

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