Compared to conventional measurement technologies CT provides a wide series of advantages, including the ability to perform measurements of the component on complex and/or non-accessible features in a non-contact and non-destructive way, and with high density of information.
In aerospace applications this is fundamental because of the often high cost of the parts, which does not allow for destructive testing. CT also lets engineers quickly evaluate the conformance of parts before high-cost machining processes.
When measuring for example the freeform surfaces of turbine blades CT can provide a high density of points in a shorter amount of time than conventional tactile CMMs, and being a non-contact technique there is no need for probe tip compensation when inspecting free form surfaces.
Fundamental factors to be considered when using CT include the achievable geometrical magnification which depends on the part size and geometry, the part material and thickness.
This article is taken from "An introduction to x-ray computed tomography for dimensional metrology in aerospace" by Valentina Aloisi.
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