Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1974-01-23
1976-11-30
Corbin, John K.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
356161, G01B 902
Patent
active
039945995
ABSTRACT:
A method of measuring wall thickness of a tubular glass article which comprises directing a beam of coherent light against the outer surface of the article at an angle such as to cause reflection of a portion of the beam from the outer surface and refraction of another portion of the beam by the outer surface to the inner surface which is then reflected from the inner surface and refraction out of the outer surface. The reflected rays pass outwardly from the article to a distance such as the rays converge and form interference fringes, the spacing of which is related to wall thickness. The spacing between said interference fringes is compared with a predetermined standard and a reject signal is created when the fringe spacing deviates from the predetermined standard by a predetermined amount. The method includes the step of directing additional beams of coherent light against circumferentially spaced points such that the additional beams are reflected from the outer and inner surfaces of the tubular article. The interference fringe spacing of these interference fringes are compared to one another. When the interference fringes from the several beams deviate from one another, there is a lack of concentricity between the outer and inner surfaces of the tubular article.
REFERENCES:
patent: 2518647 (1950-08-01), Teeple et al.
patent: 3720471 (1973-03-01), Kasahara et al.
Brown, D. C. and Rome, T. L., "A Simple Demonstration of the Interference and Coherence of Light," American Journal of Physics, vol. 40 (1972) pp. 470-471.
Corbin John K.
Holler E. J.
Lynch Charles S.
Owens--Illinois, Inc.
Rosenberger R. A.
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