Patent ID: 7305118
Filing Date: 2007-12-04
Classification: F01D,G01B

Abstract:
1. A device for measuring a throat area in a vane ring for gas turbine engines, the vane ring having an annular array of vanes defining a plurality of individual throats between adjacent leading and following vanes of the array, the device comprising: at least one primary lighting source adapted to radiate light onto a vane ring in a manner to provide an area of reflectance surrounding an area of primary shadow, the area of primary shadow substantially corresponding to an area of a selected throat to be measured, the at least one primary lighting source being positioned sufficiently close to the vane ring such that the at least one lighting source provides the area of reflectance substantially without secondary shadow, said secondary shadow being caused by interruption of light from the at least one primary source by a portion of the vane ring; a detector positioned for capturing data regarding said area of reflectance and said area of primary shadow; and a processor for analyzing the data to determine dimensional data regarding the area of the selected throat.