Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2005-08-09
2005-08-09
LeDynh, Bot (Department: 2862)
Electricity: measuring and testing
Magnetic
Displacement
Reexamination Certificate
active
06927567
ABSTRACT:
A passive blade detection sensor exploits the electrically conductive trait of typical turbo machinery components such as fan, compressor and turbine blades. A permanent magnet is placed strategically adjacent to a wire coil to generate a single pulse/antipulse signal when a blade passes in front of the sensor. The electrically conductive blade allows eddy currents to flow briefly as it passes through the magnetic field, the local reluctance is momentarily increased, and the magnetic field is momentarily changed. The coil is sensitive only to the portion of change through its cross section, so that a simple voltage pulse, useful for precise timing of blade passage, is produced. Since the device is only sensitive to fast changes in local conductivity, blades can be detected through non-ferrous barriers such as typical engine case walls.
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Tappert et al., Monitoring blade passage in turbomachinery through the engine case (no holes), Aerospace Conference Proceedings, 2002 IEEE, vol. 6, Iss., 2002, pp. 6-3125-6-3129.
Roeseler Cory
von Flotow Andreas H.
Bell Boyd & Lloyd LLC
Hood Technology Corporation
LeDynh Bot
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