Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1983-07-05
1985-10-08
LaRoche, Eugene R.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 132
Patent
active
045452580
ABSTRACT:
An electrical circuit provides an output signal having a frequency representative of an input signal which has a fundamental frequency responsive to a parameter. The circuit has an amplifier having an adjustable amplitude response with an input coupled to the input signal and an output for providing the output signal as a function of the input signal. A filter is coupled to the amplifier and to the output signal for at least partially determining the amplitude response of the amplifier. The filter has an adjustable rolloff frequency characteristic. An adjustable impedance is coupled to the filter to adjust the amplitude response of the amplifier and adjust the rolloff frequency characteristic of the filter as a function of the input signal. A controller is coupled to the output signal and provides a control signal for adjusting the adjustable impedance and hence the amplitude response of the amplifier and the rolloff frequency characteristic of the filter as a function of the output signal.
REFERENCES:
patent: 3709034 (1973-01-01), Herzl
patent: 3864972 (1975-02-01), Burgess et al.
patent: 3885432 (1975-05-01), Herzl
patent: 3940707 (1976-02-01), Fernandez
patent: 4207543 (1980-06-01), Izakson et al.
patent: 4270391 (1981-06-01), Herzl
Halkias, Christos C., and Millman, Jacob, Integrated Electronics, McGraw-Hill, 1972, pp. 340-341.
LaRoche Eugene R.
Mottola Steven J.
Rosemount Inc.
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