Methods for liquid measurement using quasi-static reference subs

Details Methods for liquid measurement using quasi-static reference subs Methods for liquid measurement using quasi-static reference subs

1990-09-19

1992-07-07

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

367908, 367 99, 181124, 181402, G01F 2328

Patent

active

051272660

ABSTRACT:
Methods for measuring liquid levels and leak rates in a storage tank, using an acoustic transducer and a quasi-static reference device that positions an acoustic target within a predetermined distance range below the surface of the liquid. A method for measuring the height of the surface of a liquid, i.e., liquid level. In a tank comprising the steps of (a) positioning the emitting and receiving acoustic transducers below the surface of the liquid, (b) positioning a plurality of fiducials separated by known distances such that at least two of the fiducials lie below the surface of the liquid, (c) emitting acoustic signals, (d) receiving and measuring the travel times for the reflections of the acoustic signals from the liquid surface and the fiducials, (e) estimating the speed of sound in the liquid using the travel times for the acoustic signals in the liquid between at least two of the fiducials, and (f) calculating the height of the liquid surface by multiplying the speed of sound in the liquid by the travel time from the liquid surface to a known height above the bottom of the liquid, and adding the known height to the product of the speed of sound and travel time.

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