Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-01-08
1976-06-29
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
346 33P, 346 33F, G01R 3312
Patent
active
039671941
ABSTRACT:
A magnetic flux leakage method and apparatus for inspecting magnetizable test objects such as pipelines are disclosed. Magnetic diodes are connected to give temperature-independent readings of flux leakage and are spaced apart according to the size of the flaws sought to be detected. Groups of diodes are overlapped to provide complete coverage of the area sought to be inspected. Certain of the largest signals received at any one time from the groups of diodes are transmitted to recording means to reduce the number of signals recorded. Diode signals are subtracted from each other to determine relative differences in detected fluxes. For inspecting pipelines, the diodes and magnets are mounted on the apparatus by mounting assemblies which pivot about three axes and the diodes and magnets are urged yieldingly toward the pipeline wall by members formed of open cell foam polyurethane. To aid in locating the flaws along the pipeline, signals from magnetic markers placed along the pipeline are detected and recorded with signals from flaws. This abstract is not to be construed in any way to define or limit the invention set forth below.
REFERENCES:
patent: 3060315 (1962-10-01), Scherbatskoy
patent: 3116452 (1963-12-01), Schmidt
patent: 3162505 (1964-12-01), Hall
patent: 3413653 (1968-11-01), Wood
Beaver Ruby C.
Clasen Theodor
Henning Wolfgang
Johnson Emil S.
Corcoran Robert J.
Vetco Offshore Industries
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