Measuring and testing – Vibration – By mechanical waves
Patent
1981-09-24
1984-05-08
Gill, James J.
Measuring and testing
Vibration
By mechanical waves
73629, G01N 2904
Patent
active
044467362
ABSTRACT:
A method of testing the integrity of the internal lining of a hollow body, especially a pipeline, by transmitting an ultrasonic wave from the exterior of the body through the adjacent wall of the body and monitoring the wave, if any, reflected from the opposite wall. In many cases, especially concrete linings, an intact or partially intact lining on the adjacent wall will absorb the ultrasonic wave and there is no reflected wave. A reflected wave frequently indicates loss of the lining on the adjacent wall although in some cases depending on, for example, the thickness of the lining or the material of which it is made, a reflected wave may be obtained even when the lining is intact. In such cases comparison of the reflected wave with predetermined standards provides an indication of whether or not the lining is intact.
REFERENCES:
patent: 3036151 (1962-05-01), Mitchell et al.
patent: 3308651 (1967-03-01), Cullen
patent: 3777552 (1973-12-01), Fletcher
patent: 3813926 (1974-06-01), Stubbeman
patent: 3940952 (1976-03-01), Mitchell
patent: 4187425 (1980-02-01), Thompson
J. Krautkramer et al., "Werkstoffprufung mit Ultraschall", 3rd Edition 1975, Springer Verlag, Berlin, Heidelberg, New York, p. 515.
Gill James J.
Imperial Chemical Industries plc
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