Product Description (Details)
GM32 · Technical information · 8011923 · V1.4 · © SICK AG 11
Subject to change without notice
2.2 Signal evaluation
The optimized algorithms of the GM32 evaluation electronics process the measurement
signal of the receiver element together with the associated parameters according to the
DOAS (Differential Optical Absorption Spectroscopy) method.
Fig. 2 Absorption spectra from sample gases (schematic)
The method is based on the physical capability of gas molecules to absorb light energy in
the typical wavelength ranges for the respective types of gas. Spectral dissection in the
receiver element captures the absorption of gas molecules at characteristic points of the
spectrum in the IR wavelength range 200 to 400 nm. Corresponding sections within this
range are evaluated depending on the device type. The optimized algorithms used here
ensure concentrations of gas components searched for are determined without cross-
sensitivity to other gases. To do this, the respective evaluation IR range for the components
to be measured is defined so that no “foreign gases” disturb the spectrum structure.
To Next Page
Loading...
Need help?
General
