Comparison of Eddy Current Probes to Generation 4 LineProbes

摘要

The Generation 4 Non-Contact Stress Measurement System (Gen 4 NSMS) uses either optical orelectrical probes and high-speed electronics to acquire blade deflection data that can be related to stress.Multiple data sets have been acquired simultaneously on an engine using Gen 4 optical line probes andactive eddy current probes, both of which require a direct view of the blades, and through-the-casepassive eddy current probes with no direct view of the blades. Comparisons of amplitudes andfrequencies determined from data using the different probe types are presented in this paper.