Velocity measuring system
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United States of America Patent
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Aug 12, 2014
Grant Date -
Aug 22, 2013
app pub date -
Dec 18, 2012
filing date -
May 21, 2010
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Abstract
A laser Doppler velocimeter uses self-mixing amplification of backreflections from scatterers below the surface of a flow. A time domain signal is divided into segments that are roughly equal to a transit time of particles through a focus of a laser beam. The segments are connected to a frequency domain through the use of an FFT algorithm to produce frequency domain data segments. Signal-to-noise ratio is enhanced through signal processing techniques using the segments to produce a final enhanced signal spectrum.
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