Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-09-17
1976-11-02
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 67, G01R 3108
Patent
active
039900037
ABSTRACT:
A buried conduit shielding flaw detector is disclosed which provides a noestructive 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. When the current amplitude measuring device is an oscilloscope, the display of the induced current pulse has a signature which is characteristic of the type of flaw detected in the pipe. A second current amplitude measuring device may be coupled to the pipe itself so that the ratio of the magnitude of the current pulse induced in the sense wire, to a second current pulse induced in the pipe, can be determined independently of the distance separating the loop antenna from the pipe.
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Agee, Jr. Forrest J.
Roberts Huey A.
Edelberg Nathan
Elbaum Saul
Gibson Robert P.
Strecker Gerard R.
The United States of America as represented by the Secretary of
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