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Development of an imaging system for the detection of alumina on turbine blades

Research output: Contribution to journalArticle

Original languageEnglish
JournalMeasurement Science and Technology
Volume25
Issue number3
DOIs
DatePublished - 5 Feb 2014

Abstract

An imaging system capable of detecting alumina on turbine blades by acquiring LED-induced fluorescence images has been developed. Acquiring fluorescence images at adjacent spectral bands allows the system to distinguish alumina from fluorescent surface contaminants. Repair and overhaul processes require that alumina is entirely removed from the blades by grit blasting and chemical stripping. The capability of the system to detect alumina has been investigated with two series of turbine blades provided by Rolls-Royce plc. The results illustrate that the system provides a superior inspection method to visual assessment when ascertaining whether alumina is present on turbine blades during repair and overhaul processes.

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