Device for measuring the density of liquid and gas

专利名称：Device for measuring the density of liquid

and gaseous substances and method foroperating the device

发明人：Alfred Wenger申请号：US05/782703申请日：19770330公开号：US04114423A公开日：19780919

摘要：The device comprises a thin vibratable plate to be introduced into thesubstances whose density is to be measured, and the plate is held by a holder at aholding point and is vibrated by at least one vibration exciter in operative engagementwith the plate. The vibrations of the plate are detected by at least one vibration detectoroperatively associated with the plate at a point spaced from the point or points at whichvibrations are imparted to the plate. An electronic unit is connected to the vibrationexciters and the vibration detector and forms therewith an oscillator having an input fromthe vibration detector and an output supplied to the vibration exciters. The vibrationexciters are so positioned with respect to the plate, and so energized by the electronicunit, that the plate vibrates in a manner such that two nodal lines intersect in the range ofeach holding point at which the plate is supported by a holder. While the plate may havevarious configurations, it is preferably circular and is so energized that the nodal linesextend diametrically of the plate and intersect at its center, with the center forming theholding point at which the holder supports the plate. The electronic unit includes a metermeasuring the periods of the vibration.

申请人：INSTITUT DR. ING. REINHARD STRAUMANN AG

代理机构：McGlew and Tuttle

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