Calibration circuit for ultrasonic flowmeter

Details Calibration circuit for ultrasonic flowmeter Calibration circuit for ultrasonic flowmeter

1983-06-09

1985-04-09

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

73 3, G01F 166, G01F 2500

Patent

active

045093733

ABSTRACT:
A calibration circuit for an ultrasonic flowmeter of the type described in U.S. Pat. No. 3,981,191 wherein a frequency counted variable delay is used to simulate flow. A stable gated oscillator is used to feed a counter whose accuracy is checked against a frequency standard. A BCD switch is used to load the counter with a count representing a desired variable delay. When the count is reached the oscillator is stopped and a variable delay signal is put out by the counter, to be combined with a fixed delay signal for simulation of flow in the upstream or downstream channel of the flowmeter.

REFERENCES:
patent: 3780577 (1973-12-01), Brown
patent: 3981191 (1976-09-01), Brown et al.

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