Charge converter for vibration monitoring instrumentation

Details Charge converter for vibration monitoring instrumentation Charge converter for vibration monitoring instrumentation

1982-04-01

1983-11-29

Kreitman, Stephen A.

Measuring and testing

Vibration

Sensing apparatus

G01H 100

Patent

active

044174764

ABSTRACT:
Apparatus for monitoring mechanical vibrations in a component part of an operating machine such as a large electrical power generator includes an electric charge producing transducer, preferably a piezoelectric accelerometer, affixed to the component part of the machine to be monitored, and a charge converter network located within the machine but relatively remote from the transducer. The charge converter network accepts the signal from the transducer, in the form of electrical charge generated at a rate and magnitude representative of the mechanical vibrations, and converts the charge signal to a conventional electronic signal. The charge converter network includes a differential operational amplifier having a resistive-capacitive feedback network providing equal impedance values to a corresponding resistive-capacitive network at the noninverting input of the amplifier. The transducer output is applied between the differential input terminals of the amplifier. The output signal is substantially free of the effects of common mode signals and other electrical interferences arising from a severe electrical environment such as that found within an electrical power generator.

REFERENCES:
patent: 3455148 (1969-07-01), Foster et al.
Instruction Manual, Model 2735 Charge Amplifier, Endevco, Pasadena, Calif. (Apr. 1978) pp. 3-9 to 3-12, 5-1 to 5-3, 6-1, and circuit diagram.
Handbook of Operational Amplifier Circuit Design, Stout & Kaufman, McGraw-Hill (1976) p. 4-19.

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