Method for detecting thinned out portion on inner surface or out

Details Method for detecting thinned out portion on inner surface or out Method for detecting thinned out portion on inner surface or out

1989-06-09

1991-01-08

Hannaher, Constantine

Radiant energy

Infrared-to-visible imaging

250332, 250334, G01J 502

Patent

active

049838369

ABSTRACT:
A method for detecting a thinned out portion on the inner surface or the outer surface of a pipe, comprising heating or cooling a pipe to be tested from the outer surface or the inner surface thereof so that a difference in temperature is produced between two portions of the outer surface or the inner surface of the pipe corresponding to a thinned out portion and a normal portion of the inner surface or the outer surface of the pipe; shooting the outer surface or the inner surface of the pipe by means of a thermal imaging system to obtain a thermal image of the difference in temperature; and then calculating a differential value of a temperature distribution of the thermal image of the difference in temperature on a line passing the highest temperature point or the lowest temperature point in the thermal image of the difference in temperature. Then, two points of inflection are determined on both sides of the highest temperature point or the lowest temperature point of the temperature distribution for the thinned out portion, on the basis of the differential value of the temperature distribution; and then an extent of the thinned out portion is detected on the basis of a distance between the two points of inflection of the temperature distribution.

REFERENCES:
patent: 4218707 (1980-08-01), Reed et al.
patent: 4468136 (1984-08-01), Murphy et al.
patent: 4644162 (1987-02-01), Bantel et al.
patent: 4647220 (1987-03-01), Adams et al.
patent: 4872762 (1989-10-01), Koshihara et al.
patent: 4886370 (1989-12-01), Koshihara et al.

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