Tube wall thickness measurement

Details Tube wall thickness measurement Tube wall thickness measurement

1981-06-22

1985-01-01

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

2503591, 378 59, G01N 2300

Patent

active

044917317

ABSTRACT:
An apparatus and method for measuring the thickness of a tube wall while the tube experiences motion relative to the apparatus is disclosed. The apparatus comprises means for generating a radiation beam and means for positioning the beam relative to a tube so that the beam sequentially passes along at least three selected beam paths. Each beam path passes through at least two distinct measuring points within the cross section of the tube wall. At least three measuring points are passed through by at least two different radiation beams. Beam intensity detection means are provided for detecting the intensity of the transmitted beam after it passes through the tube wall, and produces a detected value of the intensity, which is supplied to a processing means which determines the tube wall thickness based upon the detected value after it transmitted through the tube and the known intensity value of the beam before it is transmitted through the tube. The invention is also directed to a means for preventing radial deflections of a tube during measuring comprising pairs of rollers, means for pressing the rollers to the tube and control means for regulating the pressing force that the pressing means exerts on the tube.

REFERENCES:
patent: 2975281 (1961-03-01), Williams
patent: 3109095 (1963-10-01), Van Horne
patent: 4038550 (1977-07-01), Wassen et al.
patent: 4187425 (1980-02-01), Thompson

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