Fixing a geographical reference of a vehicle traveling through a

Details Fixing a geographical reference of a vehicle traveling through a Fixing a geographical reference of a vehicle traveling through a

1985-01-29

1989-08-15

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

324227, 324226, 324220, G01V 308, G01N 2772

Patent

active

048578517

ABSTRACT:
In a pipeline through which a vehicle such as a pig is travelling, a magnetically activated detector detects the presence of the approaching pig and sends a signal to switch on a transmitter unit which supplies an alternating current to an AC coil. This generates a magnetic field for a preselected period, the flux signal being then sensed by a pair of crossed coil sensors on board the pig after which the signal is processed in a unit on-board the pig. A reference pulse is then output for recording on a tape recorder also on-board the pig. This technique enables a geographical reference of the vehicle to be fixed.

REFERENCES:
patent: 2092951 (1947-09-01), Blake
patent: 2379447 (1945-07-01), Lindsey
patent: 3693075 (1972-09-01), Forster
patent: 3754275 (1975-08-01), Carter et al.
patent: 3878453 (1975-04-01), Potter et al.
patent: 3991361 (1976-11-01), Mattern et al.

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