Reduce Calibration Efforts

Current calibration methods (like partial least squares, PLS) are limited when

• significant molecular interactions or
• chemical reactions
  

occur. Use indirect hard modeling (IHM) for calibration and benefit from

• a fully automated procedure to obtain calibration models,
• smaller number of calibration samples required, and a
• significant reduction in time and cost to get your spectrometer running.
  

Calibrate in Complex Situations

Good extrapolability of models obtained by IHM permits to tackle situations where other methods fail. You can

• perform calibration in regions with no or slow reaction, and still
• use these calibration models in reactive regions with good accuracy.
  

Simplify Calibration Transfer

Classical methods require additional samples when hardware or operating conditions (e.g. temperature) change. The extrapolability of IHM calibration models  reduces this additional effort.

Technical Facts about IHM

• Superposition of physical models of pure component spectra
• Two-step calibration approach
• Account for non-linear effects like spectral shifts, baseline or peak changes
  

Peaxact Software

Our software Peaxact is based on IHM and software algorithms developed at Lehrstuhl für Prozesstechnik (Process Systems Engineering), RWTH Aachen University. It is now a state-of the art standalone application that is readily usable by practitioners. Peaxact assists you in

• automatic generation of spectral models,
• estimation of calibration constants, and
• prediction of concentrations

IHM and the software are independent of your spectrometer hardware. We have worked with spectra from e.g. Advance, BioRad/Digilab, Bomem, Bruker, and Orbital.

Further applications

There is potential in applying IHM beyond Mid-IR, NIR or Raman spectroscopy:

• NMR or UV/Vis
• (multidimensional) GC elution profiles
• Curve resolution
  

Related research

IHM is constantly improved. Find more information on recent research and publications at Lehrstuhl für Prozesstechnik (Process Systems Engineering), RWTH Aachen University.

Contact us to discuss your ideas.