Frequency-responsive filter for flowmeter transmission system

Details Frequency-responsive filter for flowmeter transmission system Frequency-responsive filter for flowmeter transmission system

1979-08-24

1981-06-02

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 132

Patent

active

042703913

ABSTRACT:
A transmission system for a vortex-shedding or swirl-type flowmeter whose meter signal lies in the low-frequency range and is therefore of low resolution, the meter signal being subject to jitter. In order to provide a jitter-free, high resolution output signal, the system includes an input amplifier responsive to the meter signal, the output of which is applied through a tracking filter to a Schmitt trigger. The trigger converts the meter signal into pulses of the same frequency which are fed into a frequency multiplier to produce a relatively high-frequency output signal of good resolution. The tracking filter serves to characterize the amplifier response to reduce the amplification gain thereof below a selected frequency level. The tracking filter operates in conjunction with a comparator assembly which compares an analog voltage whose magnitude depends on the meter signal frequency with a series of progressively increased reference voltages, each representing a predetermined frequency level. The assembly functions to render the filter operative in a stepwise manner, whereby when the meter frequency reaches any one of the predetermined frequency levels, the filter then acts effectively to reduce the amplification gain of the input amplifier to attenuate frequencies below that level, thereby minimizing the transmission of noise components in the meter signal.

REFERENCES:
patent: 3638037 (1972-01-01), McMurtrie
patent: 3709034 (1973-01-01), Herzl

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