Accoustical apparatus and method for measuring water level in a ground water well having obstructions
US7178396B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Aug 17, 2004 |
| Grant date | Feb 20, 2007 |
| Priority date | — |
| Expiry date | Mar 12, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/2962
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.