Liquid level measuring device

Details Liquid level measuring device Liquid level measuring device

Filed on

2006-01-10

Date issued

2006-01-10

Examiner

Chapman, John E. (Department: 2856)

Patent Class

Measuring and testing

SubClass

Liquid level or depth gauge

Type

Reexamination Certificate

Status

active

Patent number

06983654

Description

ABSTRACT:
The invention provides a liquid level detector using parameter measurements of sound waves passing along the waveguide and reflected from the surface of the liquid. The detector contains a membrane acoustical-electrical transducer in the case and the acoustic waveguide with reflectors immersed in liquid. The acoustic waveguide is a tube or several tubes and is connected to the detector case by a sleeve coupling. Inside the sleeve coupling is an acoustic matching unit between the membrane of the acoustical-electrical transducer and the inlet of the waveguide with the cavity connected with the cavity of the waveguide by means of the diaphragm with the channel. The case of the acoustical-electrical transducer is connected to the detector case through a damping element providing acoustic decoupling between the acoustical-electrical transducer and the main case of the detector. The end of the acoustic waveguide may be connected to a Γ-shaped or T-shaped intermediate waveguide.

REFERENCES:
patent: 3394589 (1968-07-01), Tomioka
patent: 4130018 (1978-12-01), Adams et al.
patent: 5301549 (1994-04-01), Sinclair
patent: 5471872 (1995-12-01), Cummings
patent: 6232769 (2001-05-01), Brunsch et al.
patent: 6272921 (2001-08-01), Ivanovich et al.
patent: 6612168 (2003-09-01), Barr et al.
patent: 2 672 678 (1992-08-01), None
patent: 599203 (1978-03-01), None

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