Two-wire constant current powered transducer
US5477735A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1993 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Aug 11, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/347
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A two-wire constant current powered transducer (10) for detecting, integrating and transmitting an acceleration signal (50) received from a piezoelectric crystal (12). The crystal is operatively coupled to rotating machinery (M) such that rotating anomalies correlative of wear or potential failure can be detected early enough for preventative maintenance. The transducer (10) includes two stages (30, 40). The first stage (30) is an integrator which integrates the acceleration to velocity. The second stage (40) is a gain stage. The gain stage operates with a PNP transistor emitter follower to control the output DC bias level and route the integrated acceleration signal back to the control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.