Flow rate measuring apparatus
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United States of America Patent
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-
Dec 24, 1991
Grant Date -
N/A
app pub date -
Mar 8, 1990
filing date -
Mar 8, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention is a new and novel flow rate measuring appartus comprising constant voltage or constant power anemometers with unique electronic circuits for maintaining constant voltage or constant power to a hot film or hot wire sensor. The constant power or constant voltage mode of operation is achieved by providing an operational amplifier with a negative feedback circuit driving the hot element sensor. The hot element sensor is located along the negative feedback path of the circuit between a first and second impedance. Amplifying and filtering circuits are also provided.
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