Method and apparatus for gauging well screens

Details Method and apparatus for gauging well screens Method and apparatus for gauging well screens

1989-04-19

1990-04-03

Raevis, Robert R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

29407, 291637, H04N 718

Patent

active

049145142

ABSTRACT:
A method and apparatus for gauging the separation of successive turns of a wire helically wound on a fluid pervious, cylindrical body to form a wire screen for a subterranean well comprising the scanning of two adjacent wire turns after they are formed on the rotating cylindrical body with a video camera having a magnifying lens, projecting the resultant enlarged image of two adjacent wire turns on a video screen and simultaneously projecting on the same video screen parallel visible lines alignable with the amplified space between the two wire images, with the spacing of said parallel lines calibrated to represent a prescribed maximum and minimum tolerance dimension for the magnified spacing of the wire turns.

REFERENCES:
patent: 4021840 (1977-05-01), Ellsworth et al.
patent: 4696047 (1987-09-01), Christian et al.
patent: 4787715 (1988-11-01), Ahmed et al.
patent: 4818403 (1989-04-01), Nagaoka
Wuestenhagen, "Photomask Inspection System", IBM Technical Disclosure Bulletin, vol. 15, No. 10, Mar. 1973.

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