Title

Accurate Measurement of the Planarity of an Inaccessible Surface by Means of a Pulse Echo Ultrasonic Method

Authorship

ZILBER, RAPHAEL; SHILO, KLARA

ZILBER, RAPHAEL

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SHILO, KLARA

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DOI

10.5151/2594-5327-49v1-07-12

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Abstract

An ultrasonic method for determining the degree of planarity of an inner surface, inaccessible to a mechanical instrument, with an accuracy better than 20 microns, is presented. An adapted pulse echo method is described. A comparison between the ultrasonic and the mechanical measurements, made on a specially prepared laboratory sample, yielded a very good agreement, well within the required accuracy. Some discrepancies out of this range are observed and discussed. Examples of actual measurements are given.

Keywords

ultrasonic testing, planarity measurement, inaccessible surface, pulse echo method, nondestructive testing