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Ultrasonic sensors for on-line monitoring of castings and molding processes at elevated temperatures

  • US 5,951,163 A
  • Filed: 10/16/1996
  • Issued: 09/14/1999
  • Est. Priority Date: 10/16/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for monitoring a mass of molten material in a cavity, comprising:

  • an array of buffer rods, each buffer rod having a proximal end extending into said cavity and a distal end extending outside said cavity;

    an ultrasonic transducer operable in the reflection mode mounted on the distal end of each said buffer rod;

    means for energizing said transducers so that they emit pulses of ultrasonic energy into the molten material through said buffer rods;

    receiving means for receiving return pulses from said transducers;

    axially spaced reflection means in said buffer rods at the proximal end thereof for reflecting pulses emitted by said transducers; and

    a computer for analyzing said return pulses to derive data therefrom pertaining the state of the molten material, said computer being programmed to calculate the velocity of said return pulses reflected from said axially spaced means and derive therefrom the temperature of said buffer rods between said axially spaced means.

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