Accession Number:

ADA064678

Title:

The Optical Properties of Smoke-Protective Devices,

Descriptive Note:

Corporate Author:

FEDERAL AVIATION ADMINISTRATION WASHINGTON D C OFFICE OF AVIATION MEDICINE

Report Date:

1978-10-01

Pagination or Media Count:

21.0

Abstract:

Optical properties of 13 smoke-protective devices were determined. The devices tested comprised 8 goggles and 5 fullface oxygen masks 3 rigid one-piece masks and 2 flexible hoods. Those properties evaluated were i light transmission, ii optical haze, iii prismatic deviation, iv refractive power, v optical distortion, and vi surface curvature. Data were compared with optical requirements formulated by USA Standard USAS Z 87.1 and Military Specification MIL-L-38169USAF. All clear transparencies met or exceeded standards for light transmission, and all but one an experimental hood met the standards for optical haze. All but 2 of 11 devices exceeded standards for spherical refractive power. Three fullface masks and two goggles with steep surface curvatures did not meet the optical requirements for prismatic deviation. Only 4 of 11 devices evaluated by a photographic method attained the standard for optical distortion however, when the criterion of visible distortion was employed, as outlined in the military specification, 9 of the 11 devices conformed to the standard. Optical anomalies may be caused by facepiece configuration and surface curvature found in some of the smoke-protective devices. Author

Subject Categories:

  • Optics
  • Life Support Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE