Patent ID: 8151647
Filing Date: 2012-04-10
Classification: G01H

Abstract:
1. In a turbine engine including a blade structure comprising a plurality of blades and blade tip target portions associated with the blades, and a casing surrounding the blade structure, a blade vibration monitor for monitoring blade vibration comprising: a light source; an illumination conduit having a transmission end for locating adjacent to an interior portion of the casing for projecting an image of the light source onto the blade structure in the turbine engine, the projected image comprising an axially elongated projected image; a processor for processing reflected light images from a blade tip target portion corresponding to a blade passing event; an imaging conduit comprising a receptor end defined by an array of light receptor channels, the receptor end being located adjacent an interior portion of the casing for receiving reflected light images from the blade tip target portions and having an axial component transverse to a movement path of the blades; and the processor including a sensor array having a plurality of array components for imaging locations of the light receptor channels corresponding to locations along the axially elongated projected image, the processor identifying axial locations on a blade during each blade passing event.