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Process control equipment for adverse environments

  • US 4,831,565 A
  • Filed: 04/22/1987
  • Issued: 05/16/1989
  • Est. Priority Date: 10/03/1986
  • Status: Expired due to Term
First Claim
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1. A method for adjusting a transducer in an acoustic ranging system comprising said transducer, means to cause said transducer to transmit pulses of sonic energy, and means to detect and analyze energy received from the transducer to detect an echo from a surface whose range is to be determined by the system;

  • the method including reiteratively transmitting a pulse, detecting and analyzing the ref lected energy to determine whether an anomaly in the variation of reflected energy with time represents a wanted echo, measuring a parameter indicative of the degree of assurance that the wanted echo has been correctly identified, and adjusting the transducer prior to the transmission of a further pulse, the effect of successive adjustments of the transducer on said parameter being noted so as to find an adjustment such as to maximize said parameter.

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