Method and apparatus for mapping the wall thickness of tubes dur

Details Method and apparatus for mapping the wall thickness of tubes dur Method and apparatus for mapping the wall thickness of tubes dur

1999-04-20

2000-06-20

Kim, Robert H.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356345, 356349, 356432T, G01B 902

Patent

active

060783974

ABSTRACT:
An apparatus and method for mapping out wall thickness of a tube or other object having motion in two directions. The device includes a first laser for generating ultrasound propagating inside tube wall over a particular generation spot on a surface of the tube, a second laser coupled to an interferometer for detecting produced ultrasonic echoes over a detection spot on the surface. A processor is provided for operating on recorded ultrasonic echoes and using a given value of ultrasonic velocity and the distance between the generation spot and the detection spots for determining wall thickness at a mid-point between the generation and detection spot. An optical displacement measuring device determines a displacement in two dimensions between the generation spot and arbitrary starting spot and a display for displaying wall thickness values over the surface of the tube.

REFERENCES:
patent: 4522510 (1985-06-01), Rosenewaig et al.
patent: 5633711 (1997-05-01), Nelson et al.

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