Proposed Windshield for B-1 Aircraft: An Optical Evaluation.
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1974
- Accession Number
- ADA001078
Entities
People
- Benjamin Kislin
- Thomas J. Tredici
- Wayne F. Provines
Organizations
- United States Air Force School of Aerospace Medicine