Level detector for solids

Details Level detector for solids Level detector for solids

1997-04-08

1998-05-05

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

By combining or comparing signals

367908, G01S 1508

Patent

active

057485623

ABSTRACT:
A vibrating probe for detecting a threshold level of solids within a vessel consists of an ultrasonic acoustic transducer assembly having a resonant frequency, the assembly being supported within the vessel and including a coupling member to couple the transducer acoustically to the solids at the threshold level, a transmitter for generating repeated bursts of high-frequency electrical energy and applying them to the transducer, the bursts being of sufficient amplitude to render the assembly self cleaning of adherent solids, a circuit for measuring the amplitude of ringing of the transducer after cessation of each burst, and a circuit for comparing the amplitude of such ringing at a predetermined interval after a burst with predetermined threshold level. Both the predetermined interval and the threshold level may be selectable.

REFERENCES:
patent: 4325255 (1982-04-01), Howard et al.
patent: 4540981 (1985-09-01), Lapetina
patent: 4821215 (1989-04-01), Woodward
patent: 4831565 (1989-05-01), Woodward

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