By
Don Davies on June 4th, 2008
Shaft displacement is an important vibration measurement for rotating machines. Shaft displacement is usually monitored by non-contact shaft displacement probes such as eddy-current probes. These probes produce a voltage proportional to the distance of the shaft surface relative to the tip of the probe. For maximum benefit, ideally two shaft displacement probes will be fitted [...]
By
Dr Colin Mercer on August 9th, 2005
The following article was written in response to a question from a visitor to the website. The gentleman in question had been reading some of the Prosig [...]
By
Dr Colin Mercer on February 3rd, 2002
The most common form of digitising data is to use a regular time based method. That is data is sampled at a constant rate specified as a number of samples/second. The Nyquist frequency, fN, is defined such that fN = SampleRate/2. As discussed elsewhere Shannons Sampling [...]
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