Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1992-03-31
1994-11-22
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
324242, G01N 2782, G01N 2772
Patent
active
053672585
ABSTRACT:
A detector for detecting joints (5) in a cast iron gas main for instance comprises a sonde (1) having a central transmitting coil (2) and the two receiving coils (3, 4) spaced one on either side of the transmitting coil. At a joint, the gap (6) between the sections of pipe causes differential magnetic coupling between the pipe and the two receiving coils (3, 4). After a pulse of drive current from a control unit is applied to the transmitting coil, comparison by subtraction of voltages induced in the receiving coils and measurement of an appreciable voltage indicates that the sonde (1) is at a joint. In a second embodiment, the sonde (101) is provided with a sealing compound supply pipe (115) and nozzles (120) from which sealing compound can be sprayed into the joint on detection thereof.
REFERENCES:
patent: 2601248 (1952-06-01), Brenholdt
patent: 3361960 (1968-02-01), Renken, Jr.; et al.
patent: 3434046 (1969-03-01), Wilson et al.
patent: 3518533 (1970-06-01), Arnelo
patent: 3786347 (1974-01-01), Mansson
patent: 3942105 (1976-03-01), Bondarenko et al.
patent: 4814702 (1989-03-01), Driggers et al.
Product Engineering, vol. 40, No. 8, Apr. 21, 1969, "Solid-State Modules Simplify the application of LVDTs" p. 160.
British Gas plc
Snow Walter E.
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