<title>Infrared fiber optic sensor for measurements of nonuniform temperature distributions</title>

Abstract

Infrared fiber (ER) optic radiometry of thermal surfaces offers several advantages over refractive optics radiometry. It does not need a direct line of sight to the measured thermal surface and combines high capability of monitoring small areas with high efficiency. These advantages of JR fibers are important in the control of non-uniform temperature distributions, in which the temperature of closely situated points differs considerably and a high spatial resolution is necessary. The theoretical and experimental aspects of such radiometry are discussed in this report.Theoretical and experimental transforming functions of the sensor during scanning of an area with a non-uniform temperature distribution were obtained and their dependence on the spacial location of the fiber and type of temperature distribution were analyzed. Parameters such as accuracy and precision were determined. The results suggest that JR fiber radiometric thermometry may be useful in medical applications such as laser surgery,hyperthermia and hypothermia.