Coriolis mass flowmeter with optical position sensors
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United States of America Patent
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Nov 17, 2009
Grant Date -
May 22, 2008
app pub date -
Nov 15, 2007
filing date -
Nov 16, 2006
priority date (Note) -
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Abstract
Coriolis mass flowmeter comprising a flow tube, at least one tube position sensor provided with a light source and with a light detector for receiving light from the light source, and drive means for causing the tube to move about an axis, the above being arranged such that the tube or a projection fastened to the tube, for example a vane, moves through a light path between the light source and the light detector, wherein a first screen with a first light-transmitting opening is placed at the side of the light source and a second screen with a second light-transmitting opening is placed at the side of the light detector, wherein the first and the second opening are identical and are correspondingly oriented, and wherein the openings are mutually parallel and aligned so as to form a prismatic light beam on the detector.
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