Method for measuring oscillation frequency of a fluid jet in a fluidic oscillator
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United States of America Patent
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Aug 19, 2003
Grant Date -
Mar 6, 2003
app pub date -
Aug 20, 2002
filing date -
Sep 1, 2000
priority date (Note) -
Expired
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Abstract
The oscillation frequency of a fluid jet in a fluidic oscillator is measured using a temperature sensor. The resistance of the temperature sensor varies as a function of the oscillation of frequency f.sub.0 of the jet. The method consists in feeding the temperature sensor with an AC voltage of frequency f, and then in determining the frequency components around the frequency 3.times.f in the output signal from the temperature sensor in order to determine the oscillation frequency f.sub.0 of the jet. The frequency components in the signal output by the temperature sensor are determined by measuring the measurement signal across the terminals of the temperature sensor, then by synchronously demodulating the measurement signal at the frequency 3.times.f, and finally by determining the frequency of the demodulated measurement signal, which frequency corresponds to the oscillation frequency f.sub.0 of the jet.
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