G - Physics – 01 – F
Patent
G - Physics
01
F
349/38
G01F 23/28 (2006.01) G01F 23/296 (2006.01)
Patent
CA 1140249
ABSTRACT OF THE DISCLOSURE Apparatus is provided for determining the level of material in a container. The apparatus comprises a vibrator structure having first and second vibrator elements arranged in coaxial and at least partial concentric, spaced relationship. Such vibrator elements are adapted to rotationally vibrate in opposite directions, with the same resonance frequency, the first element extending into the container to contact material located therein. Means are provided for generating an electrical signal representative of the amplitude of vibration of said first element. Since the amplitude of vibration is dependent upon the degree to which the vibrating element is attenuated by contact with the material in the container, the electrical signal is representative of the filling level of such material and may therefore be utilized to provide an indication and/or control of such level. The invention is an improvement over known devices in that less power is required to excite vibrations in the system than in single-element devices, but the problems of bulky design and potential inaccuracies in conventional dual-element devices are also avoided.
358653
Borden Ladner Gervais Llp
Hermann Eberhard F.
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