Flow noise reduction
US4894808A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1989 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | May 31, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/901
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The level of signal noise caused by fluid flow at a pressure transducer, such as a hydrophone or geophone, is determined by measuring the electric field induced when the fluid flow through a magnetic field. The electric field, which is proportional to flow rate, is measured by electrodes positioned about the transducer. The pressure due to the flow is derived from the flow rate voltage by a digital filter which may be adaptive, to allow for varying flow conditions, or which may employ a predetermined electric field/flow noise relation. This flow noise is then subtracted from the received signal, the resultant signal then being substantially noise free.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.