Wind Tunnel Model Surface Gauge for Measuring Roughness

摘要

The report covers research performed in the optical inspection of surface roughness by members of the Center for Manufacturing Engineering under contracts L-4718B and L-20078B with the NASA Langley Research Center. The project has proceeded along two lines: first research into a quantitative understanding of light scattering from metal surfaces and into the appropriate models to describe the surfaces themselves, and second, the development of a practical instrument for the measurement of rms roughness of high performance wind tunnel models with smooth finishes. The research has been discussed in previous articles and is only summarized here. The report is concerned primarily with the latter subject.