Dual beam laser interferometer determines airflow friction against body by measuring time-varying thickness of wind sheared oil film. Measurements yield skin friction between film and airstream. Errors from prerun oil flow, tunnel starting transients, and initial surface waves therefore eliminated.
Instrument Measures Airflow Friction Without Contact
NASA Tech Briefs ; 7 , 3
01.08.1983
Sonstige
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Englisch
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