Noncontact Holographic Thermal Imaging
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Thermal wave imaging has been invented and developed over the past several years with the goal of imaging defects or structures beneath the surface of opaque materials. Generically, this technique involves a beam of energy (laser, electron, ion,...)focussed to a point and modulated (or pulsed) at some frequency. The thermal (or heat) wave emanating from the heated region of the sample is scattered by inhomogeneities within the sample. The detected thermal wave thus contains information regarding these inhomogeneities. This information can be used to "image" the inhomogeneities as the heat source is scanned, point by point, over the sample.