Flow meter using digital signals
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United States of America Patent
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May 22, 2007
Grant Date -
Jun 1, 2006
app pub date -
Aug 5, 2005
filing date -
Nov 29, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A flow meter outputs an electric signal of a position a float within a taper-shaped tube precisely. A taper-shaped tube is made of an approximately transparent material, is mounted approximately vertically, and circulates a fluid such as water or the like, and a float is arranged within the taper-shaped tube so as to displace in a vertical direction in correspondence to a flow rate of the fluid. An LED irradiates a light ray to the taper-shaped tube and the float, makes the light ray to transmit through the taper-shaped tube, and generates a transmitted light ray. The image sensor outputs a digital image of the float within the taper-shaped tube, and a control portion 11 executes an input process of the digital signal detects the position of the float, and outputs an electric signal showing a flow rate of the fluid.
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