CT Inspections: an Introduction
Due to recent developments in complementary equipment (computers with greater processing power and speed, increasingly sensitive DR imaging panels, etc.), this same diagnostic tool indispensable to doctors has become practical for use in industrial inspections.
A Case for Using Industrial CT as an Inspection Tool
This is an exciting development because of the strengths that CT inspections have over other types of non-destructive test techniques.
CT scans, for instance, provide a clearer image and greater versatility than do traditional radiography inspections. The amount of detail rendered by a CT scan completely eclipses the grainy quality produced by film radiography. The fact that CT inspections yield a 3D model is also a noteworthy advantage over radiography; measuring flaws such as cracks or voids volumetrically is of great benefit to technicians trying to diagnose an imperfection in the subject. Technicians may even use a program to animate the model in concert with its neighboring components to simulate and assess the stresses on the test subject in its live-usage capacity.
While 3D scanning inspections can offer similar levels of precision and the feature of volumetric measurement, they cannot peer below the surface of the subject. Failure analysis performed on a part, for example, can hardly be considered complete without examining its internal components for weaknesses and flaws. The only way that 3D inspections could analyze the interior of a subject is if that subject had physically been cut open. CT inspections, naturally, do not suffer from this limitation.
Furthermore, CT scans fulfill a variety of testing needs with the use of one inspection. It can analyze internal components like a Computerized Digital Radiography inspection, measure coating and surface thickness like an Ultrasonic Thickness test, and measure features volumetrically like a 3D scanning inspection. Comparing the CT rendered model of the part to its CAD model makes finding structural flaws simple, and using the rendered model can help in generating CAD data useful for measuring geometric dimensioning and tolerances.