METHOD AND DEVICE FOR IMAGING TEMPERATURES OF A VERY HOT OPAQUE BODY

摘要

The invention concerns a device and a method for obtaining two-dimensional images of temperatures of a very hot opaque body inaccessible to a standard display system. The method consists in using, under the protection of a film unwinder device (1), a first optical element (4) focusing the opaque hot body (1) image onto a beam of optical fibres (5). The latter restores the image onto a second optical element (6) which focuses the image onto a beamsplitter (8). Two cameras (10A, 10B) thus capture the opaque hot body (1) image at different wavelengths. The combination of the resulting two images enables to monitor and determine the temperatures of the observed sequence. The invention is applicable in a variety of ways to electron beam welding, laser beam welding, or monitoring the temperature of induction-heated metal parts.