The possibility is considered of controlling the parameters of articles of complicated shape by their spatial spectra, that is, profile angle, mean diameter, and threaded article pitch.
© 1978 Optical Society of America
R. M. Bytchkov, V. P. Koronkevitch, and Yu. V. Chugui, "Threaded article parameter measurement by spatial spectra analysis," Appl. Opt. 18, 197-200 (1979)