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Inside diameter, outside diameter and wall tube gage

  • US 3,930,404 A
  • Filed: 06/21/1973
  • Issued: 01/06/1976
  • Est. Priority Date: 06/21/1973
  • Status: Expired due to Term
First Claim
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1. An ultrasonic system for simultaneously determining the inside and outside diameters and wall thickness of tubular objects, comprising in combination, first means containing a couplant medium capable of transferring ultrasonic energy for use in obtaining date for the measurement of said inside and outside diameters and wall thickness of said tubular objects disposed in said couplant medium in said first means, transducer means fixedly mounted externally of said tubular objects in said first means and immersed in said couplant medium for producing ultrasonic energy upon activation thereof, said transducer means comprising first and second transducers mounted diametrically opposite each other relative to said tubular objects in said first means for obtaining data for use in measuring said inside and outside diameters and wall thickness, electronic circuit means operably connected to said first and second transducers for producing electronic signals corresponding to the energy reflected back to and received by said transducers respectively from the tubular objects and processing said signals to provide output signals representative of the inside diameter, outside diameter and wall thickness of the tubular object being measured, and reference transducer means fixedly mounted externally of said tubular objects in said first means relative to a fixed surface and immersed in said couplant medium, said reference transducer means operably connected to said electronic circuit means for being activated simultaneously with said first andn second transducers for producing a reference signal, and said electronic circuit means processing said reference signal with said electronic signals so as to automatically compensate said system for temperature variations in said couplant medium

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