Variable area flow rate meter using optical sensing of float position in the duct
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United States of America Patent
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Mar 20, 2007
Grant Date -
Dec 1, 2005
app pub date -
May 10, 2005
filing date -
May 10, 2004
priority date (Note) -
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Abstract
A flowmeter has a variable area, vertically-oriented duct through which flows fluid whose flow rate is to be determined. A float in the duct assumes a position in the duct that depends on the flow rate of fluid in the duct. A window is located at an end of the duct in alignment with a longitudinal axis of the duct. A transducer unit projects a light beam through the window and along the axis toward the float. The transducer includes a light sensor that detects light returned by the float by reflection or some other mechanism to the transducer unit. The intensity or other characteristic of the returned light indicates the position of the float in the duct, from which the fluid flow rate may be determined.
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