Liquid presence sensor
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United States of America Patent
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Issued Date -
Nov 10, 2005
app pub date -
Apr 27, 2005
filing date -
Apr 30, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In an embodiment of the invention, a system for detecting a presence of a liquid in an ultrasonic frequency device is formed of a first electrode coupled to a voltage source and extending into a fluid reservoir of the ultrasonic device, a second electrode separated from the first electrode by a fluid gap, coupled to a common circuit point, and extending into the fluid reservoir, a first resistor in series with the voltage source and the first electrode, a voltage sensor coupled to a junction between the first resistor and the first electrode for sensing a voltage at the junction, and an apparatus for comparing the sensed voltage to a threshold voltage to determine a presence of a fluid within the fluid reservoir.
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