Patent ID: 7746448
Filing Date: 2010-06-29
Classification: G01B

Abstract:
1. A measuring apparatus for contactless detection and recordation of cooling air bores in turbine blades provided with a surface having a renewed thermal barrier coating, the apparatus comprising: a measuring head including and holding a distance measuring device, a camera apparatus, and an illumination device on a common optical axis; wherein the illumination device is configured and arranged to illuminate a point of analysis on said surface of the renewed thermal barrier coating, said point of analysis being simultaneously focused on by the camera apparatus and the distance measuring device; wherein the distance measuring device operates at a first light wavelength, and wherein the camera apparatus and the illumination device operate at a second light wavelength different from said first light wavelength; a mirror and filter device located on the optical axis between the illumination device and the point of analysis, the mirror and filter device having at least one dichroic mirror that separately transmits and reflects said first and second light wavelengths respectively to the distance measuring device and the camera apparatus; and wherein the distance measuring device is configured and arranged to evaluate a distance of said cooling holes, a location of said cooling holes, or both, based on light of said first wavelength, and wherein the camera apparatus is configured and arranged to evaluate an image of said cooling holes based on light of said second wavelength.