Measuring and testing – Volume or rate of flow – System
Patent
1975-03-14
1976-09-28
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
System
307235A, 328163, 328165, G01F 132, H03B 104, H04B 1500
Patent
active
039824349
ABSTRACT:
A fluid mechanical arrangement of a bluff body flowmeter in a pipe line is disclosed with a thermal sensor arrangement for sensing flow signals in that pipe and with a method and circuit for processing the sensed signals to subtract low frequency fluid noise signal that accompany sensed signal and extracting sensed signals related to the fluid flow rate through the pipe. Signal processing is achieved through a circuit comprising an inverting amplifier, peak detector, summing amplifier and trigger amplifier. The detector senses positive and negative peaks of the thermal sensed flow signals and produces signals the frequency of which corresponds to the flow rate of fluid through the pipe. The detector also generates negative and positive peak indicating signals and stores them in combination with an output image of the thermistor sensed fluid flow signal. The inverting amplifier inverts the thermal sensed signal for driving the peak detector. The summing amplifier sums the thermal sensed signal with the signals stored by the peak detector and produces a resultant output signal which has a frequency corresponding to the flow rate through the pipe and which substantially excludes any component of the low frequency noise. The trigger amplifier converts the summing amplifier output signals into trigger pulses for a utilization means.
REFERENCES:
patent: 2986655 (1961-05-01), Wiseman et al.
patent: 2996613 (1961-08-01), Glomb
patent: 3398373 (1968-08-01), Caswell
patent: 3535927 (1970-10-01), Mahon et al.
patent: 3852617 (1974-12-01), Vidovic
patent: 3854334 (1974-12-01), Herzl
Eastech, Inc.
Goldstein Herbert
Padden Frederick W.
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