Process for sensing defects on a smooth cylindrical interior sur

Details Process for sensing defects on a smooth cylindrical interior sur Process for sensing defects on a smooth cylindrical interior sur

1985-08-05

1987-11-17

Willis, Davis L.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

356237, G01N 2147

Patent

active

047071320

ABSTRACT:
The cylindrical interior surface of small diameter metal tubing is optically inspected to determine surface roughness by passing a slightly divergent light beam to illuminate the entire interior surface of the tubing. Impingement of the input light beam components on any rough spots on the interior surface generates forward and backward scattered radiation components. The forward scattered components can be measured by blocking direct and specular radiation components exiting the tubing while allowing the forward scattered radiation to travel past the blocking location. Collecting optics are employed to converge the forward scattered radiation onto a photodetector generating a signal indicative of surface roughness. In the back scattered mode, back scattered radiation exiting the tubing through the entrance opening is reflected 90.degree. by a beam splitter towards collecting optics and a photodetector. Alternatively, back scattered radiation can be transmitted through a fiber optic bundle towards the collecting optics. The input light beam can be supplied through a white light fiber optic bundle mounted coaxial with the first bundle.

REFERENCES:
patent: 3981592 (1976-09-01), Williams
patent: 4447152 (1984-05-01), Rainford et al.
patent: 4598997 (1986-07-01), Steigmeier et al.

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