Microsonic LCA-2 - Manual (Page 32)

Page 32 of 51 Parameter change in the double sheet control
P ARAMETER CHANGE IN THE DOUBLE SHEET CONTROL
The function of the double sheet detection is to detect two or more sheets lying one on top of the other or
to detect other laminary materials. The sensor system consists of a transmitter and a receiver complete
with integrated evaluation electronics.
A high-frequency ultrasonic transmitter beams from the underside against the sheet material. The emitted
ultrasonic pulse excites the sheet material into vibrations. The effect of these vibrations is for a very small
sonic wave on the other side of the sheet to spread. This wave is received by the ultrasonic receiver
located there. In the case of sheet one on top of the other (double sheet), the receiver detects the
difference in signal and sets its outputs accordingly.