Bubble detector
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United States of America Patent
Stats
-
Jan 26, 1982
Grant Date -
N/A
app pub date -
Dec 13, 1979
filing date -
Dec 13, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a flow metering apparatus a bubble detector for detecting bubble formation in tubing subject to deformation from internal fluid pressure includes a light source and a light detector. The light detector is positioned on the opposite side of the tubing from the light source such that the light transmitted through the tubing to the detector is dependent on the presence of fluid in the tubing and on the shape of the lumen of the tubing. A control circuit responsive to the output of the detector interrupts operation of the metering apparatus when the light transmitted through the tubing falls below a predetermined minimum level. False interruptions resulting from deformation of the tubing by pressure changes in the fluid are prevented by forming members which engage the wall of the tubing adjacent the light source and light detector.
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