Apparatus and method for measuring movement
US4706498A · kind A · utility
20Cited by
9References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1985 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Sep 23, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P15/132
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An accelerometer comprising a ferrofluid coated permanent magnet as a proof mass mounted for substantially friction-free movement in a hollow vessel on which vessel are mounted three coils that are used with an electrical circuit to detect and measure movement of the proof mass in response to an outside force and to return the proof mass to a null position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.