A SYSTEM AND A METHOD FOR DETECTING MATERIAL PARAMETERS

摘要

A detecting unit (50) is provided, comprising a transmitter (52, 152, 252, 352) arranged to emit electromagnetic radiation having a frequency in the range of 0,1 to 10 THz towards a paper web (12) moving in a printing unit, a receiver (54, 154, 254, 354a, 354b) arranged to receive electromagnetic radiation being transmitted through or reflected by said paper web (12) and to create a signal (S1) representing the received radiation, and a controller (70) having an input channel (72) for receiving the signal (S1), and a calculating unit (74) for determining a measure relating to the properties of the paper web (12) from the signal (S1).