Optics: measuring and testing – Shape or surface configuration
Reexamination Certificate
2011-08-02
2011-08-02
Pham, Hoa Q (Department: 2886)
Optics: measuring and testing
Shape or surface configuration
C356S614000, C250S559220, C250S559350, C250S559360
Reexamination Certificate
active
07990547
ABSTRACT:
An apparatus for measuring erosion of an edge of an aerofoil portion of a fan blade includes a laser source to direct light at a position on the edge of the fan blade. A detector detects light reflected from the position on the edge of the fan blade. A computer measures the distance from the laser source to points on the edge of the fan blade to produce a profile of the edge in terms of x and z coordinates. The computer calculates the distances of points on the edge of the fan blade from a centroid of the profile. The computer detects peaks in the distance of points from the centroid of the profile. The computer selects two peaks with the greatest distance therebetween. The computer determines the distance between the two peaks and compares the determined distance and a predetermined distance to determine if there is unacceptable erosion.
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Bauer David
Fee Conall
Robinson Craig
Roche Stephen
Oliff & Berridg,e PLC
Pham Hoa Q
Rolls-Royce plc
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