Apparatus for video inspection of the interior surface of tubula

Details Apparatus for video inspection of the interior surface of tubula Apparatus for video inspection of the interior surface of tubula

1997-11-03

1999-08-10

Chin, Tommy P.

Television

Special applications

Hazardous or inaccessible

348 85, H04N 718

Patent

active

059366648

ABSTRACT:
The apparatus for video inspection of the interior surface of tubular goods, includes: an elongated mounting plate having a first and a second end; a first compartment at the first end of the mounting plate which has a light transmissive window facing the second end of the mounting plate; a second compartment at the second end of the mounting plate which has a light diffusing window facing the first end of the mounting plate; a video camera having a wide angle lens in the compartment; a light source in said second compartment; a first prism disposed in front of said lens; and, external means for monitoring and recording camera output.
The wide angle lens in combination with the prism provides for a dual field of view, part of which is transmitted through the prism for viewing a small circumferential area opposite the inclined side of the prism, and, part of which constitutes a peripheral view of nearly the entire circumference, "C", of the tubular received directly by the lens. Light reflecting from nearly the entire circumference, "C", of the tubular provides means for general inspection of large areas of the tubular for suspected defects, "D". Light transmitted through the prism provides a means for close inspection of suspected defects, "D", and movement of the prism closer to the lens provides for greater magnification thereof.

REFERENCES:
patent: 2632801 (1953-03-01), Donaldson
patent: 2849530 (1958-08-01), Fleet
patent: 5690605 (1997-11-01), Hamlin et al.

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