Apparatus and method for measuring vibration of a rotating member
US4757717A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1986 |
| Grant date | Jul 19, 1988 |
| Priority date | — |
| Expiry date | Nov 25, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H11/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electrical conductor forming a grid only partially circumferentially surrounds the path of the outer portion of a rotatable member. The member has a magnet coupled thereto for influencing the grid to produce a signal indicative of vibration of the member whenever the magnet is within a predetermined distance of the grid. During the interval that the magnet does not influence the grid, a synthesis signal, indicative of vibration of the member during the previous influence portion of the revolution, is generated. The influence signal and the synthesis signal may be provided to processing apparatus for obtaining vibration information. Providing both an influence signal and a synthesis signal substantially simplifies processing apparatus that would otherwise be needed should only an essentially null signal be available during the interval in which the magnet does not influence the grid. In another embodiment, switching means coordinated with rotation of a plurality of members permits use of a plurality of partially circumferentially disposed grids for monitoring vibration of each of the plurality of members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.