Electromagnetic boat speedometer having boundary layer velocity compensation
US9983223B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 2014 |
| Grant date | May 29, 2018 |
| Priority date | — |
| Expiry date | Feb 20, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P5/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic boat speedometer includes a boundary layer velocity compensating arrangement comprising a primary coil for producing a primary electromagnetic field within a relatively large first volume of water, a secondary coil for producing a secondary electromagnetic field within a relatively small portion of the first volume of water immediately adjacent the hull of the boat, and a set of first electrodes removably mounted in one or more openings in the hull of the boat, such that the tips of the first electrodes extending into the relatively small water portion. In one embodiment, the coils are simultaneously energized in opposition, so that the primary and secondary electromagnetic fields are in opposition. In a second embodiment, the coils are energized alternately, and the signals produced by the electrodes are modified to achieve the desired boundary layer compensation. A second set of second electrodes may be included in the second embodiment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.