On-the-fly dimensional imaging inspection

摘要

A method and system are provided for inspecting a plurality of target features arrayed in spaced arrangement on a surface of a target object, such as but not limited to inspection of the location of cooling air holes in the surface of a turbine blade or vane.

主权项

1. A method for inspecting a plurality of target features arrayed in spaced arrangement on a surface of a target object, comprising the steps of:
providing a fixture for holding the target object; providing a high speed camera; performing a first measurement pass,
wherein the first measurement pass comprises the steps of:
selectively positioning at least one of the holding fixture and the high speed camera relative to the other in an intermittent motion along a three-dimensional path over a plurality of selected target features with stationary pause;each time the high speed camera orientates in a stationary pause relationship to one of the selected target features, capturing a first image and determining a first location of the selected target feature during a first exposure duration using the high speed camera, the high speed camera enabling inspecting of the plurality of selected target features, intermittent stationary pause of the selected target feature relative to the high speed camera over a first duration of a first frame capture resulting in a true position tolerance of the selected target feature; and performing a second measurement pass,
wherein the second measurement pass comprises the steps of:
selectively positioning at least one of the holding fixture and the high speed camera relative to the other in continuous relative motion along the three-dimensional path over the plurality of selected target features without pause;each time the high speed camera orientates to one of the selected target features, capturing a second image and determining a second location of the selected target feature during a second exposure duration using the high speed camera while in relative motion, the high speed camera enabling inspecting of the plurality of selected target features without pause, movement of the selected target feature relative to the high speed camera over a second duration of a second frame capture being less than a predetermined fraction of the true position tolerance of the selected target feature.