Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1980-09-25
1983-06-21
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
226 49, 2541344, 324226, G01R 3312, G01N 2790, B65H 4900
Patent
active
043896111
ABSTRACT:
An apparatus for sending a sensor, such as an eddy current sensor, into a condenser, heat exchanger or steam generator tube. The apparatus first sends the sensor, which is attached to a cable, into the tube by means of a pressurized fluid which pushes the sensor along tube interior. At the extreme of the sensor's travel into the tube, a first ferrule attached to the rear of the cable blocks a first hydraulic passage in the apparatus. By virtue of slidable control pistons in the apparatus, this blocking cuts off the pushing pressure behind the sensor and then causes wheels to frictionally engage the cable to pull the sensor back to its starting position. At this time, another ferrule, carried near the sensor end of the cable, blocks a second hydraulic passage to thereby disengage the wheels from the cable. The cycle of (1) sensor pushed into the tube (2) sensor withdrawn from the tube, is now complete.
REFERENCES:
patent: 3277420 (1966-10-01), Council
patent: 3495546 (1970-02-01), Brown et al.
patent: 4087748 (1978-05-01), Pigeon et al.
Pigeon Michel
Saglio Robert
Vienot Claude
Commissariate a l'Energie Atomique
Greer, Jr. Thomas J.
Strecker Gerard R.
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