Infrared Transmittance Of Borosilicate Based Fiber Insulations

Gosta Ljungdahl; Carl G. Ribbing

doi:10.1117/12.941914

12 November 1987 Infrared Transmittance Of Borosilicate Based Fiber Insulations

Gosta Ljungdahl, Carl G. Ribbing

Proceedings Volume 0823, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VI; (1987) https://doi.org/10.1117/12.941914
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

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.

Citation Download Citation

Gosta Ljungdahl and Carl G. Ribbing "Infrared Transmittance Of Borosilicate Based Fiber Insulations", Proc. SPIE 0823, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VI, (12 November 1987); https://doi.org/10.1117/12.941914

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