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Infrared Transmittance Of Borosilicate Based Fiber Insulations

Collimated transmittance spectra for boroxide alkali-silicate glass wool with different fiber diameter distributions are reported. Three distinct maxima at 1520, 1300 and 600 cm-1 were observed. Using a normalizing procedure it is demonstrated that the peaks at 1520 and 600 cm-1 decrease with increasing average fiber diameter. The transmittance maximum at 1300 cm-1 shows a much weaker fiber size dependence which is explained by the refractive index of the fiber material n=1 at that wavenumber, causing the refraction losses to vanish. Comparison with bulk glass data and model calculations suggest that the collimated trans-mittance at this wavenumber is enhanced by rescattering in the forward direction.