<title>High-speed imaging/ratio temperature radiometer</title>

For analyzing combustion and melting phenomena, it is necessary not only to measure the deformation and its acceleration of the applied object which is being deformed at a high speed and under high temperature, but to detect the temperature of the object and to know the temperature distribution over the object. By the recent development in electronics, including new solid-state image sensors such as area CCD and C-MOS sensors, and the progress of image processing techniques, new imaging radiometers have been developed which two-dimensionally acquire objects in motion at a high speed and under high temperature, and present the temperature distribution over the object immediately. The popular pseudo-color thermal imager only indicates the relative differences of radiance from the measured object by assigning different colors, but does not show the correct temperature, because their calculated temperature is radiance temperature whose radiation is measured at a single wavelength. In this paper, we present the concept of ratio temperature measurement which measures radiance from the object at two wavelengths and presents 'truer' true temperature than radiance temperature. We have developed a new high speed imaging/ratio temperature radiometer by using the Photocam-RGB high-speed video camera readily available on the market. Here we present the outline of our experiments.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.