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Airflow sensing systemDisclosed is an airflow sensing system for determining the type of airflow flowing over a flight surface. A hot film sensor is driven by a constant voltage feedback circuit that maintains the voltage across the sensor at a predetermined level. A signal processing circuit receives an output signal of the feedback circuit and determines whether the output signal is indicative of laminar, transitional or turbulent airflow. Transitional airflow is distinguished from turbulent airflow by a signal having significant energy in a low-frequency passband from 50-80 Hz. The signal processing circuit drives a three-color LED display to provide a visual indication of the type of airflow being sensed.
Document ID
20080004099
Acquisition Source
Langley Research Center
Document Type
Other - Patent
Authors
Gelbach, Herman R.
Morgan, Michael D.
Date Acquired
August 24, 2013
Publication Date
December 28, 1993
Subject Category
Mechanical Engineering
Report/Patent Number
Patent Application Number: US-PATENT-APPL-SN-824790
Patent Number: US-PATENT-5,272,915
Funding Number(s)
CONTRACT_GRANT: NAS1-18574
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-5,272,915
Patent Application
US-PATENT-APPL-SN-824790

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