Device for monitoring a predetermined level of a liquid in a con

Details Device for monitoring a predetermined level of a liquid in a con Device for monitoring a predetermined level of a liquid in a con

1996-10-16

1998-03-24

Cummings, Scott

Measuring and testing

Liquid level or depth gauge

340618, 367163, 367165, 367908, G01F 2328, G01J 172

Patent

active

057300259

ABSTRACT:
For monitoring a predetermined level of a liquid in a container an ultrasonic transducer is fitted on the outer surface of the container wall at a measurement point situated at the height of the level to be monitored. The ultrasonic transducer contains a piezoelectric element which generates, when excited by an alternating voltage pulse having a given transmission frequency, an ultrasonic transmission pulse which is transferred via a diaphragm to the container wall and which converts ultrasonic vibrations transferred from the container wall to the ultrasonic transducer into electrical reception signals. The diaphragm comprises on the side facing the container wall protuberances which adjoin the container wall. Between the diaphragm and the container wall a coupling layer is arranged, the thickness of which is determined by the height of the protuberances. As a result of this the formation of a layer of air between the diaphragm and the container wall is prevented and a jump in impedance avoided so that a good acoustical coupling exists between the diapragm and the container wall.

REFERENCES:
patent: 3277435 (1966-10-01), Thompson et al.
patent: 4004266 (1977-01-01), Cook et al.
patent: 4326274 (1982-04-01), Hotta et al.
patent: 4709361 (1987-11-01), Dahlstrom et al.
patent: 5121628 (1992-06-01), Merkl et al.
patent: 5363341 (1994-11-01), Schwald et al.

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