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Ultrasonic edge detector

  • US 5,126,946 A
  • Filed: 11/13/1990
  • Issued: 06/30/1992
  • Est. Priority Date: 11/13/1990
  • Status: Expired due to Term
First Claim
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1. A system for creating a control signal having a value indicative of the position of the lateral edge of a moving web, said system comprising:

  • means for creating a succession of ultrasonic pulses from a transmitter, each of said pulses being created at a known transmit time in response to a transmit signal, each of said pulses having a number of oscillations defining a pulse envelope having a pulse start position;

    means for directing each of said pulses toward an ultrasonic receiver along a selected path whereby the position of said lateral edge in said path determines the energy of each of said pulses as each pulse is received by said receiver;

    means for converting each received pulse into an electrical signal having an amplitude determined by the energy of the received pulse;

    means for spacing said receiver from said transmitter a distance causing each of said pulses to be received by said receiver at a given time after said transmit signal for a given ambient temperature;

    means for creating a logic window having a given time-based length and occurring at a set time after said transmit signal, said set time being slightly less than said given time whereby each of said electrical signals occur at an offset time in said logic window at said given ambient temperature; and

    , means for controlling the value of said control signal by the amplitude of said electrical signal.

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