Vertical geophone having improved distortion characteristics
US8050144B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 8, 2009 |
| Grant date | Nov 1, 2011 |
| Priority date | — |
| Expiry date | Mar 9, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/182
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A vertical geophone that includes a lower frequency spring, which forms part of the geophone electrical circuit, that is positioned directly on the lower end cap This arrangement eliminates the “spring supported by a spring” arrangement of prior art geophones to minimize geophone distortion and simplify tuning of the frequency springs. A contact spring is positioned between the lower frequency spring and the lower pole piece for forming part of the geophone electrical circuit. One surface of contact spring includes a plurality of wiper surfaces that ensure consistent sliding electrical contact against either the bottom surface of the lower pole piece or the upper surface of the lower frequency spring. The obverse surface of the contact spring is preferably spot welded to the other adjacent member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.