Sash position sensor using image analysis
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United States of America Patent
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Jun 14, 2016
Grant Date -
Apr 3, 2014
app pub date -
Sep 28, 2012
filing date -
Sep 28, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
Systems and methods for determining the area of a sash opening in a fume hood formed by at least one movable sash panel. Fume hoods have sash panels mounted over a hood opening to an enclosure structure of the fume hood. The sash panels are moved to open or close the fume hood at the sash opening for access to a work surface. A camera is mounted in a fume hood enclosure space to capture an image of the sash opening. An area determining function is configured to receive a digital representation of the image. The image is analyzed by detecting edges in the image. The image edges corresponding to edges of the sash opening are identified. The area of the sash opening is determined by applying a scaling value to the area formed by the image edges corresponding to the area of the sash opening.
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