The achievable measurement uncertainty is considerably influenced by the refractive index of the air and, possibly, by the body temperature of the product to be measured.
The refractive index is calculated with the aid of the Edlen formula from air temperature, air pressure and air humidity.
For determination of the environmental parameters, the following sensors are used:
www.ptb.deWesentlichen Einfluss auf die erreichbare Messunsicherheit haben der Brechungsindex der Luft und ggf. die Körpertemperatur des Messguts.
Die Brechungsindex wird mit Hilfe der Edlen-Formel aus Lufttemperatur, -druck und -feuchte berechnet.
Zur Bestimmung der Umweltparameter werden folgende Sensoren eingesetzt:
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