Measuring and testing – Volume or rate of flow – Thermal type
Patent
1990-03-08
1991-12-24
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
7320425, G01F 168
Patent
active
050741470
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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Analytical Services & Materials, Inc.
Goldstein Herbert
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