Proposed Windshield for B-1 Aircraft: An Optical Evaluation.
Final rept. 1 May-1 Sep 72,
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX
Pagination or Media Count:
A square sample segment, 25.4-by 25.4-cm 10-by 10-in., representative of the B-1 aircraft proposed windshield was evaluated to determine if Air Force optical specifications would be met in the state-of- the-art production. The 3.53-cm-thick 1.39- in. five-layer laminant segment was composed of acrylic, silicone, polycarbonate, silicone, and polycar-bonate layers, respectively. Light transmission was 66 in normal position and 54 when sloped to the corresponding installed angle 65 from normal. Deviation values, measured directly by installed angle 65 from normal. Deviation values, measured directly by displacement of a HeNe laser beam, varied from 0 to 7 min of arc when measured over the entire segment. A distortion map plotted at 2.54-cm 1-in. intervals showed as much as a 3-min arc change per 2.54 cm. The haze value was 2.95. Spectral transmission was acceptably flat between 300 amd 900 nm, taken with a Cary spectrophotometer. The intensity of the first-order multiple image was 1.4 as bright as the primary image. These readings indicated that the segment failed to meet required specifications in distortion and deviation, but it was acceptable in all other respects. Author, modified-PL
- Ceramics, Refractories and Glass