ABSTRACT
Recent years have seen significant advances in the instrumentation available for the monitoring and diagnosis of problems in rotating machinery. Over 50 years ago, the development of the non-contacting eddy current transducer was indeed a major step for the industry, and these are now a crucial component of many systems. More recent developments have been the refinements of wideband AE sensors which are enabling practitioners to progress some way beyond the basic process of counting events, the basis of early AE investigations. Other important developments have the enhancement of telemetry systems with significantly enhanced bandwidth capabilities.
