Real-time spectrum analysis is used for analyzing and attempting to predict mechanical faults and failures in rotating machinery; to analyze vibratory motions of components, systems and structures; for the analysis of the noise constituents in these systems, and for many other purposes. Real-time spectrum analyzer (RTA) development has a 40-year history that involves overcoming numerous technical barriers, challenging measurement techniques and physical obstacles. In 2003 the skilled practitioner has the capability to write software embedded in a computer, purchase building blocks for development of an RTA, or purchase turn-key systems some of which weigh less than 3 pounds. Software development allows for constant monitoring of critical elements without an engineer being on the scene. This paper travels down memory lane from the earliest days in the development of these instruments at the Applied Research Laboratories at Columbia University to the latest product offerings.
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