In this work a new method for calculating the optical properties of an absorbing film grown on substrates, including the
real and imaginary part of the index of refraction is shown. In particular the thermal radiation of a growing oxide-film
on a heated steel specimen is measured by a CCD camera with a near infrared (1000nm) band-pass filter. The observed
radiation-signal shows significant temporal patterns due to interferences in the growing oxide film. Under the
assumptions of known specimen temperature, constant optical properties (dielectric functions) of each layer and
semitransparent films, it is possible to develop a model by which variations of the resulting emissivity with varying
film-thickness can be explained. From this model, which is derived from the calculation of the reflectance of a thin
absorbing film on an absorbing substrate, the complex index of refraction of the film can be determined without explicit
knowledge of the optical constants of the respective layers. Since a matrix-camera is used to monitor the process
changes of the emissivity over time, spatial information may also be derived. In this way it is possible to detect spatial
inhomogeneities in the film and to determine the cause (either inhomogeneous growth rates or spatial variations of
material properties). In addition, these results can be used for emissivity correction in non-contact thermal imaging. This
method is not limited to oxide films and can be used for other heat treatment processes that deposit semitransparent
films as well.
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