Measuring and testing – Volume or rate of flow – Thermal type
Patent
1998-06-09
1998-12-29
Dougherty, Elizabeth L.
Measuring and testing
Volume or rate of flow
Thermal type
G03F 168
Patent
active
058544259
ABSTRACT:
A method for compensating for the time constant (delay time) of hot-wire/hot-film in a constant voltage anemometer is provided. The method is a two-part series of steps, the first series for measuring the time constant in a particular wind tunnel setup and a second series for compensating for the measured time constant. The first series or measuring steps include setting up a hot-wire/hot film for a particular test at a specific operating point. A step increase in sensor current is applied and the resistance change of the sensor is measured. The time to reach 63% of the final resistance value is recorded. (The time constant is defined as the time to reach 63% of the resistance value). The measured time constant value is used to match the time constant in the CVA circuit.
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Dougherty Elizabeth L.
Greene Esq. Raymond L.
Tao of Systems Integration, Inc.
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