Geophone having improved sensitivity
US8098546B2 · kind B2 · utility
2Cited by
61References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 8, 2009 |
| Grant date | Jan 17, 2012 |
| Priority date | — |
| Expiry date | Jun 29, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/181
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A geophone utilizing an Alnico-9 magnet and having an improved sensitivity over Alnico-9 geophones of prior art through the lengthening of the parasitic air gap between the upper and lower pole pieces which, results in less magnetic flux leakage. The flux concentration through the geophone coils is increased and shifted towards the ends of the magnet. The increase of sensitivity of geophone of the present invention over prior art geophones may exceed 3 dB. The axial length of the coil bobbin is increased, and the positions of the electrical coils are moved towards the ends of the magnet to align with the shifted magnetic flux.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.