  In this article, we study the thermal light emission from individual fibers
of an industrial glass material, which are elementary building blocks of glass
wool boards used for thermal insulation. Thermal emission spectra of single
fibers of various diameters partially suspended on air are measured in the
far-field by means of infrared spatial modulation spectroscopy.These
experimental spectra are compared with the theoretical absorption efficiency
spectra of cylindrical shaped fibers calculated analytically in the framework
of Mie theory taking as an input the measured permittivity of the industrial
glass material. An excellent qualitative agreement is found between the
measured thermal radiation spectra and the theoretical absorption efficiency
spectra.
