Two-wire constant current powered transducer

Details Two-wire constant current powered transducer Two-wire constant current powered transducer

1993-08-11

1995-12-26

Williams, Hezron E.

Measuring and testing

Vibration

Sensing apparatus

73593, 73660, 330261, 327336, G01H 1106, H03F 345, H03F 304

Patent

active

054777356

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.

REFERENCES:
patent: 3860481 (1975-01-01), Gopal et al.
patent: 4328441 (1982-05-01), Kroeger, Jr. et al.
patent: 4479093 (1984-10-01), Mattisson
patent: 4612620 (1986-09-01), Davis et al.
patent: 4843344 (1989-06-01), Cox
patent: 4885707 (1989-12-01), Nichol et al.
patent: 4994693 (1991-02-01), Popescu

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