METHOD FOR CALIBRATING A WALL THICKNESS INSPECTION MACHINE

摘要

A computer senses a voltage which is representative of wall thickness and defines with the use of a voltage/thickness curve the thickness of that wall portion. To define this curve, a plurality of voltage/thickness points are inputted into the computer. Each point is defined by sensing and defining the voltage of a wall portion on a calibration standard having a known thickness and defining a calibration thickness corresponding to that voltage using the following equation: $equating\; these\; calibration\; thicknesses\; to\; the\; corresponding\; voltages\; produced\; by\; the\; sensing\; means\; when\; sensing\; said\; at\; least\; two\; thicknesses\; of\; the\; standard.\mathop{\mathrm{image}}$