| abstract |
A method, including: detecting in a nondestructive manner a marker ( 10, 12, 50, 70, 76, 78 ) that is fully submerged in a substrate ( 14 ) to obtain spatial information about the marker; detecting in a nondestructive manner the marker after a period of time to obtain a change in the spatial information; and using the change in the spatial information to determine a change in a dimension ( 30 ) of the substrate. The method may be used to measure creep in a gas turbine engine component. |