Optical method and apparatus for determining the average...

Details Optical method and apparatus for determining the average... Optical method and apparatus for determining the average...

G - Physics

01

B

33/49, 88/0.1

G01B 9/02 (2006.01) G01B 11/02 (2006.01)

Patent

CA 1036401

ABSTRACT OF THE DISCLOSURE The average aperture width in a small area of an apertured member, such as a shadow mask. for a cathode-ray tube, is determined by passing a beam of substantially monochromatic light through an area of the member to form a combined interference and diffraction pattern, detecting the intensities of at least two light fringes of the pattern, generating electrical signals which are representative of the detected intensities, and then deriving the average width of apertures in the lit area of the member from the generated signals. -1-

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