Accession Number : ADD003770

Title :   Pulsed Loop Antenna-Conduit Electromagnetic Radiator Test Technique for Electromagnetic Shielding Flaw Detection in Buried Conduits and Shielded Conductors.

Descriptive Note : Patent,


Personal Author(s) : Agee,Forrest J , Jr ; Roberts,Huey A

Report Date : 02 Nov 1976

Pagination or Media Count : 7

Abstract : A buried conduit shielding flaw detector is disclosed which provides a non-destructive method for testing buried pipes, cables and conduits to locate and measure shielding flaws without the necessity of excavation. A sense wire is longitudinally disposed within the pipe and a current amplitude measuring device is connected on one end thereof. A loop antenna external to the buried pipe, is moved along, parallel to the pipe being tested. The antenna is connected to a voltage pulsing means for generating a pulse of electromagnetic radiation which will couple the pipe. When the antenna is moved to within the vicinity of a flaw in the pipe, the electromagnetic radiation from the antenna is coupled through the flaw to the sense wire within the pipe. A current pulse is thereby induced in the sense wire which is, in turn, detected by the current amplitude measuring device. The amplitude of the induced current is characteristic of the size of the flaw detected in the pipe.

Descriptors :   *Detectors, *Nondestructive testing, Conduits, Shielding, Loop antennas, Electromagnetic fields, Faults

Subject Categories : Electrical and Electronic Equipment
      Construction Equipment, Materials & Supplies
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE