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A study of model deflection measurement techniques applicable within the national transonic facilityMoire contouring, scanning interferometry, and holographic contouring were examined to determine their practicality and potential to meet performance requirements for a model deflection sensor. The system envisioned is to be nonintrusive, and is to be capable of mapping or contouring the surface of a 1-meter by 1-meter model with a resolution of 50 to 100 points. The available literature was surveyed, and computations and analyses were performed to establish specific performance requirements, as well as the capabilities and limitations of such a sensor within the geometry of the NTF section test section. Of the three systems examined, holographic contouring offers the most promise. Unlike Moire, it is not hampered by limited contour spacing and extraneous fringes. Its transverse resolution can far exceed the limited point sampling resolution of scanning heterodyne interferometry. The availability of the ruby laser as a high power, pulsed, multiple wavelength source makes such a system feasible within the NTF.
Document ID
19830004805
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Hildebrand, B. P. (Spectron Development Labs., Inc. Costa Mesa, CA, United States)
Doty, J. L. (Spectron Development Labs., Inc. Costa Mesa, CA, United States)
Date Acquired
September 4, 2013
Publication Date
February 1, 1982
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-165853
NAS 1.26:166853
Accession Number
83N13075
Funding Number(s)
CONTRACT_GRANT: NAS1-16564
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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