Geophone having improved damping control
US8208347B2 · kind B2 · utility
2Cited by
60References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 8, 2009 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Mar 15, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/46
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A geophone in which a coil bobbin assembly ideally includes a provision for receiving a third coil winding between the upper and lower coils. A third mass-tuning coil is wound around the bobbin whose purpose is to adjust the overall mass of the bobbin assembly with greater accuracy and precision than can be achieved by machining techniques alone. Mass is adjusted by adding or subtracting one or more turns of wire in the tuning coil. The tuning coil is preferably electrically shorted for increasing geophone damping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.