Measurement and application of an infrared image restoration filter to improve the accuracy of surface temperature measurements of cubes

This paper presents the experimental investigation of the application of an image restoration technique aimed at improving the accuracy of infrared su rface temperature measurements of cubes placed in a vertical channel flow. These cubes, used to determine distributions of the local heal transfer coe fficient, show large spatial temperature gradients. The image restoration t echnique, developed to correct the spatial image degradation, is based on t he two-dimensional Optical Transfer Function constructed from line spread f unctions (LSF). The benefit of the application of the infrared image restor ation technique is verified with temperature measurements acquired from a s econd independent technique.