Measuring and testing – Liquid level or depth gauge
Patent
1978-05-19
1980-01-08
Goldberg, Gerald
Measuring and testing
Liquid level or depth gauge
G01F 2328
Patent
active
041821777
ABSTRACT:
An assembly and method for determining the level of sound absorbing solids in a fluid-filled vessel. A number of sound receivers are mounted at spaced vertical positions to the exterior of the vessel along a generally vertical line, and a sound generator is mounted atop the vessel approximately 180.degree. around the circumference of the vessel from the receivers. The sound waves are intermittently or cyclically generated by the sound generator, they are received by the receivers, and evaluated. For those receivers mounted below the level of the solids, the energy received will be low, while for those mounted above the solids level in the fluid phase of the vessel, the energy received will be high. For cellulosic chips, the receivers are tuned to respond primarily to sound at a frequency of about 3200 Hz. Alternatively, a number of sound generators are mounted at spaced vertical positions along the vessel, and a single receiver is mounted in operative association with the vessel fluid phase, the generators being selectively actuated for given time periods, and the receiver output being displayed relative to each generator actuation.
REFERENCES:
patent: Re29435 (1977-10-01), Bergdahl et al.
patent: 2668365 (1954-02-01), Hogin
patent: 3079596 (1963-02-01), Atkinson
patent: 3920155 (1975-11-01), Whited
Goldberg Gerald
Kamyr Incorporated
Roskos Joseph W.
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