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• This demonstration illustrates the “Corner Reflection” approach to tank level measurement via ultrasound.
• The displays that follow contain plots derived from data collected while emptying a tank of water.
• Two ultrasound sensors were used to generate the liquid level data.
• Both sensors were mounted to the lower outside of the tank, one at a 60° angle from the horizontal, the other at a 45° angle.
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The upper section of each display portrays data from the 60° sensor
The lower section of each display portrays data from the 45° sensor
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The plots on the left-hand portion of each display portray the tank with:
• The fill level shaded in blue,
• The sound zone from the 60° sensor shaded in green, and
• The sound zone from the 45° sensor shaded in red.
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The plots in the upper right-hand portion of each display show signal data from the 60° sensor.
The plots in the lower right-hand portion of each display show signal data from the 45° sensor.
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Actual ultrasound signals with the intersections of the sound zones and the wall of the tank highlighted. These zones are where strong “corner shots” will occur.
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The correspondence between the colored shaded regions and the sections of the tank wall intersected by the sound zones.
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Enlarged views of signals as they pass through sound zones (highlighted) on tank wall.
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Note the strong “corner shot” signal that occurs when the fill level passes through the second sound zone along the tank wall.
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The enlarged views of the signal emphasize the dramatic pulse from the “corner shot”.
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Sequence of displaysas tank empties from 24” to 2.5”.
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Contact:
Walter C. Weimer, Manager
Process and Measurement Technology
Battelle, Pacific Northwest Division
(509) 375-6922
Technical Contacts:
Richard Pappas [email protected]
(509) 375-4546
Scott Cooley [email protected]
(509) 375-3604
Don Daly [email protected]
(509) 375-4365