The Transmission, Absorption Coefficient, and Index of Refraction of the B-1 and FB-111 Windscreens
Interim rept. 15 Jan-15 Sep 1974
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX
Pagination or Media Count:
Spectral characteristics were measured on the B-1, and two types of FB-111 windscreens in the spectral region of 0.3 - 2.0 micrometers. The total transmission, index of refraction, dispersion and Lambert absorption coefficients were determined to quantitate the effective protection offered by these windscreens to high-intensity radiation. Total windscreen transmission measurements were performed spectrophotometrically with each sample in normal incidence and adjacent to the detection aperture, allowing both the direct transmission and the forward scatter to be measured. The index of refraction for each windscreen was measured using a laser spectrometer system. The index of refraction at eight wavelengths in the visible spectrum was accurately determined with this system. Finally, a method is presented to calculate the light attenuation offered by the three windscreens to this region of spectral radiation at various angles of incidence.
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