Accoustical apparatus and method for measuring water level...

Details Accoustical apparatus and method for measuring water level... Accoustical apparatus and method for measuring water level...

2007-02-20

2007-02-20

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Reexamination Certificate

active

10919240

ABSTRACT:
An acoustic distance measuring device adapted to measure the level of water in a ground water well by first emitting a sonic low frequency acoustic pulse and measuring the time-of-flight for each reflected pulse from the surface of the water in the well. Each reflected pulse must have an amplitude greater than a threshold amplitude or it will be rejected. Based on time-of-flight measurements from the first low frequency sonic pulse reception windows are established for a second higher frequency sonic pulse. To refine the time-of-flight measurements for the second pulse only those reflected pulses whose reception times fall within the reception windows are accepted. A more accurate calculation of the distance from the sonic pulse emitter to the surface of the water is accomplished by using the refined time-of-flight measurements from the second higher frequency pulse.

REFERENCES:
patent: 4210969 (1980-07-01), Massa
patent: 4934186 (1990-06-01), McCoy
patent: 4972386 (1990-11-01), Lau
patent: 5319974 (1994-06-01), Lenz et al.
patent: 6865137 (2005-03-01), Lyon et al.

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