Particle Detection
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United States of America Patent
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Issued Date -
Feb 21, 2008
app pub date -
May 12, 2005
filing date -
May 12, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for detecting particles in a fluid involves passing any ultrasonic signal through the fluid. A Fast Fourier Transform analysis is performed on the received signal, to determine a characteristic frequency of the fluid where the amplitude is greatest. Both the amplitude of FFT spectrum at the characteristic frequency and the time-domain amplitude are monitored. A drop either in the amplitude of the FFT spectrum at the characteristic frequency or the time-domain amplitude indicates the appearance of particles in the fluid.
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