×

METHOD AND APPARATUS UTILIZING A TRANSMITTER AND RECEIVER FOR DETECTING THE PRESENCE OF A METALLIC OBJECT WITHIN A PIPE

  • US 3,597,680 A
  • Filed: 12/19/1968
  • Issued: 08/03/1971
  • Est. Priority Date: 12/19/1968
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of detecting the presence of a metallic object located within a pipe comprising through a source of electromagnetic energy disposed within the pipe, producing an electromagnetic wave in a magnetic field, about 80 percent of whose stored energy is within the outer boundaries of the pipe, and whose frequency is influenced appreciably by the proximity of the source to a metallic object inside the pipe, and nonappreciably by the proximity of the source to such an object outside the pipe, transmitting the wave, through radiating the same, to a region outside the pipe, and from a position outside the pipe, observing any changes in the frequency of the wave transmitted to said region with changes in the location of the source an an indication of the presence of the metallic object.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×