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Apparatus for detecting objects

  • US 6,314,054 B1
  • Filed: 05/05/2000
  • Issued: 11/06/2001
  • Est. Priority Date: 05/07/1999
  • Status: Expired due to Term
First Claim
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1. An apparatus for detecting objects each of which is composed of a label applied to carrier, the apparatus comprising:

  • a transmitter for emitting ultrasonic waves;

    a receiver for receiving ultrasonic waves spaced apart from the transmitter so that the objects can be passed between the transmitter and the receiver, the receiver producing an output signal representing an attenuation of ultrasonic waves when one of the objects is between the transmitter and receiver;

    means for comparing the receiver output signal with a threshold value in order to detect the label; and

    balancing means for automatically determining the threshold value as a function of the receiver output signal registered during a balancing procedure when a segment including at least one of the carrier material and the label is located between the transmitter and the receiver.

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