Vibration monitoring in the frequency domain with a capacitive a

Details Vibration monitoring in the frequency domain with a capacitive a Vibration monitoring in the frequency domain with a capacitive a

1990-08-27

1991-12-03

Williams, Hezron

Measuring and testing

Vibration

Sensing apparatus

73652, 73659, 73579, 73583, G01H 1106, G01P 15125

Patent

active

050690710

ABSTRACT:
A vibration monitoring system employing a capacitive accelerometer determines the energy associated with one or more frequency components within the frequency spectrum of the vibration signal. The capacitive accelerometer operates as a mixer due to its time varying capacitance which provides a measure of the vibration. When the accelerometer is excited by an AC signal the output from the accelerometer comprises beat frequencies due to the mixing of the time varying capacitance and the AC signal. By changing the frequency of the AC signal the location of the beat frequencies in the frequency domain of the accelerometer output can be shifted. Subsequent bandpass filtering to attenuate frequencies except those associated with the frequency component and demodulation to bandshift the energy of the filtered signal energy to DC, creates a DC value which provides a measure of the energy present at the frequency component.

REFERENCES:
patent: 4206400 (1980-06-01), Holdren et al.
patent: 4435737 (1984-03-01), Colton
patent: 4694687 (1987-09-01), Bonin et al.
patent: 4928203 (1990-05-01), Swindal et al.
patent: 4930042 (1990-05-01), Wiegand et al.
patent: 4930043 (1990-05-01), Wiegand
Tibor L. Foldvari and Kurt S. Lion, "Capacitive Trasducers", Instruments and Control Systems, Nov. 1977.

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