Pipe wall thickness monitoring apparatus

Details Pipe wall thickness monitoring apparatus Pipe wall thickness monitoring apparatus

1979-08-02

1982-04-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356387, G01N 2186

Patent

active

043249825

ABSTRACT:
Two boxes are mounted in vertical alignment adjacent a cylindrical mandrel surface, one above the mandrel axis and one below. The lower box contains a light source with a rectilinear filament parallel to the mandrel axis. The upper box contains an array of photosensors equidistantly spaced in a horizontal plane in a direction toward and away from the mandrel axis. Each of the photosensors is part of a separate electronic circuit with transistors, resistors, and a light emitting diode. The light emitting diodes are arranged in a display to form a column that lights up from the bottom in accordance with the thickness of a pipe wall being formed and the position of the edge of its shadow on the array of photosensors. In an alternative embodiment, a white scale is disposed in the upper box at an angle from the direction of the light source and the position of the edge of the shadow of the pipe wall on the scale gives a visual indication of thickness of the pipe wall.

REFERENCES:
patent: 3529169 (1970-09-01), Heaney et al.
patent: 3724958 (1973-04-01), Callan
patent: 4129384 (1978-12-01), Walker et al.

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