A simple fibre-optic autocorrelation tachometer
K. T. V. Grattan, J Jiwei, Andrew W. Palmer, Beverley T. Meggitt · Journal of Physics E Scientific Instruments · 1989
The principle of a simple and inexpensive optical-fibre-based correlation technique is demonstrated for the monitoring of the slow rotation of a shaft of an electric motor. The use and possible extension of the techniques employed are discussed.