Universal doppler flowmeter tester
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United States of America Patent
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Mar 8, 1988
Grant Date -
N/A
app pub date -
Dec 19, 1986
filing date -
Dec 19, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A circuit simulating the electrical signal response of a flowing liquid whose velocity is to be measured by a Doppler flowmeter. The circuit takes the electrical flowmeter transmit signal from a Doppler flowmeter and modifies its frequency to derive a simulated Doppler shifted signal. The latter signal is used to modulate the transmit signal in a double side band, balanced modulator which suppresses the frequency of the transmit signal and produces upper and lower side band frequencies mimicking a Doppler shifted return signal. The latter signal is fed to the signal receiving transducer of a Doppler flowmeter for test purposes.
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