Imaging rotating turbine blades in a gas turbine engine
AssigneeSiemens Power Generation, Inc.
InventorMichael Twerdochlib
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Abstract
A system (10) for imaging a rotating turbine blade (20) includes an image projector (12) receiving a moving image of the rotating blade and projecting a movement-compensated image. The system also includes an image receptor (14) for receiving the movement-compensated image. A sensor (16) is provided for generating information (28) indicative of a velocity of the rotating turbine blade and a processor (18) generates a drive signal (30) responsive to the information for controlling a position of the image projector. The image projector is controlled to receive the moving image at a desired angular position and to project the movement-compensated image to the image receptor so that the movement-compensated image appears stationary relative to the image receptor.
Claims14
A system for imaging a thermal barrier coating of a rotating turbine blade comprising:
- an image projector receiving a moving infrared image corresponding to infrared radiation emitted by a thermal barrier coating of a rotating turbine blade and projecting a movement-compensated image;
- an infrared image receptor operable for receiving the movement-compensated image without a need for an illumination source;
- a sensor generating information indicative of a velocity of the rotating turbine blade;
- and
- a processor generating a drive signal responsive to the information for controlling a position of the image projector to receive the moving infrared image at a desired angular position and to project the movement-compensated image so that the movement-compensated image appears stationary relative to the infrared image receptor.
A method of imaging a thermal barrier coating of a rotating turbine blade of a turbine rotor comprising:
- receiving infrared radiation emitted by a first blade of a row of rotating blades of a turbine rotor using a movable image projector without using an illumination source;
- sensing a velocity of rotation of the rotating blades;
- using the velocity to adjust a phase of movement of the movable image projector relative to the first blade to synchronize a projected image of the first blade relative to an image receptor;
- using the velocity to adjust a phase of movement of the movable image projector to bring a second blade into a field of view of the image projector;
- and
- using the velocity to adjust the phase of movement of the image projector to make a projected image of the second blade appear stationary relative to the image receptor.
Dependencies are inferred from the claim text.