Method and apparatus for optically testing cylindrical surfaces

Details Method and apparatus for optically testing cylindrical surfaces Method and apparatus for optically testing cylindrical surfaces

1984-04-02

1986-08-19

Willis, Davis L.

Optics: measuring and testing

By polarized light examination

With birefringent element

35016222, G01B 902

Patent

active

046066403

ABSTRACT:
Disclosed is a method and apparatus for optically testing cylindrical surfaces in which a collimated beam of monochromatic light is directed to a variably spaced linear grating which produces two first order cylindrical wavefronts: one, a converging beam in the blaze direction and, two, a diverging beam in an antiblaze direction. The blaze direction beam converges into a line focus. Either a concave or convex cylindrical mirror may be positioned with its axis at that line focus in the appropriate part of the beam to return the rays along their original path to the grating where they interfere with the antiblaze wavefront. By locating a screen of any suitable type in the path of the antiblaze beam, a fringe pattern representing the figure quality of the cylindrical surface under test is formed on the screen. Both concave and convex, coated and uncoated, cylindrical surfaces can be tested by this method and apparatus.

REFERENCES:
Munnerlyn, "A Simple Laser Interferometer", Applied Optics, vol. 8, No. 4, pp. 827-829, Apr. 1969.
Charlot et al., "New 10-.mu.m Infrared Interferometer and Its Applications", Applied Optics, vol. 14, No. 4, pp. 890-893, Apr. 1975.

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