Robust Laser Interferometer (RLI) Findings Relative Condition Monitoring and Diagnostics/Prognostics Engineering Management
EPOCH ENGINEERING INC GAITHERSBURG MD
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In recent years, a series of machinery condition andor machinery health measurement projects have employed a Robust Laser Interferometer RLI, a non-contact vibration measurement system introduced for wideband vibration measurements. The specific implementation is described. Wideband 0-262.144 kHz, large dynamic range up to 180 dB demonstrated in acceleration measurement data is presented for differing machinery monitoring measurement projects. A discussion is presented regarding not only the availability of high frequency information, but also regarding its value for diagnostics and prognostics. Examples selected include direct spectrumtime series information, as well as envelope processed information. System advantages are discussed in terms of dynamic effects, environmental effects, and ease of use. Specific examples and measurement history are provided to highlight individual parameters such as bandpass, sensitivitysignal-to-noise, dynamic range, amplitude frequency response, low frequency performance, high frequency performance, and user friendliness in the vibration measurement scenario. Invited paradigm shifts are discussed, including the availability of improved fault inception tracking data and new measurement opportunities. Two implementation design approaches are discussed, point-and-shoot and fiber-optic routing. A summary is presented, including an assessment of growth potential.