Transient Thermal Imaging System
Original Publication Date: 1985-Dec-01
Included in the Prior Art Database: 2005-Feb-19
When a sample surface is illuminated by a pulsed heating beam, spatial variations in the thermal properties will cause corresponding variations in the surface temperature rise. A technique is described for obtaining thermal images rapidly by spatially mapping the peak temperature of the sample surface immediately after the application of the heating pulse. The entire sample 10 is illuminated with a short heating pulse which, in this example, is generated by a pulsed laser beam 12 passing through modulator 14. An infrared (IR) camera 16 receives the thermal image through filter 18 and continuously scans the sample surface at TV rates. A frame-grabber 20 attached to the infrared camera grabs a frame from the camera output immediately after the application of the heating pulse.