Periodic Thermoreflectance Layer-by-Layer Non-Destructive Testing
Herein, this invention disclosure relates to a method to non-invasively monitor printing in-situ. This technique has the ability to monitor a few layers into the material, in a manner that can differentiate between different defect types. This technique uses thermal waves to measure the properties during print a few layers below the surface, and reconstruct the characteristic of the layers immediately below. With this invention, defects can be easily detected and reworked during production.
Unlike ultrasounds, a transducer does not need to touch the surface. Unlike X-Ray/CT-scanners, technique can be done during build to correct any manufacturing defects before completion. Further, X-Ray/CT scanners are extremely expensive and unlikely to be integrated into printers.
Binghamton University RB544