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  SPECIAL SYSTEMS >> DOUBLE SHEET DETECTION
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Double sheet detection system

The Principle is that an ultra high frequency ultrasonic transmitter fires a sonic beam at the underside of the sheet. The beam causes the sheet to vibrate, which in turn generates a very small sound wave on the other side of the sheet.
This is then evaluated by the ultrasonic receiver. If there are two sheets (a double feed), the signal is weakened to such an extent that it instantly detects it.

Ultrasonic sensors have set new standards in automation

Ultrasonic sensors emit short, high-frequency sound pulses at regular intervals. These propagate in the air at the velocity of sound. If they strike an object, then they are reflected back as echo signals to the sensor, which itself computes the distance to the target based on the time-span between emitting the signal and receiving the echo. As the distance to an object is determined by measuring the time of flight and not by the intensity of the sound, ultrasonic sensors are excellent in double detection applications.
Specifications.

Model name

Dbk-4/CD/o/M18 E+S
Transmitter-receiver spacing 40mm 3mm
Transmitter-receiver blind zone 7mm in front of both transmitter and receiver
Permissible angular deviation 45 from the perpendicular to the sheet

Working range

Papers with grammages of 20-1200 g/m

Residual ripple

10%

Response time, Trigger mode

4.5 ms
Response time, Free run mode 24.5 ms
Tripping delay, Trigger mode 40 ms or state frozen until next enable
Tripping delay, Free run mode 160 ms
Housing Nickel-plated brass sleeve
Operating temperature +5C to +60C
Weight 270g