NASA NTRS · 19800010878
Surface measuring technique
Abstract
Measurement of the surface contour of a large electrostatically formed concave reflector using a modified Foucault or knife edge test is described. The curve of the actual electrostatically formed reflector surface is compared to a curve representing a reference sphere. Measurements of surface slope and deviation are calculated every 15 cm along the reflector's horizontal and vertical diameters. Characterization of surface roughness on a small scale compared to the laser spot size at the reflector are obtained from the increased laser spot size at a distant projection screen.
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Spiers, R. B., Jr.. 1980-02-01. Surface measuring technique. https://ntrs.nasa.gov/citations/19800010878
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