The optical properties of smoke-protective devices.

Details

• Creators:
  Vaughan, John A.
• Subject/TRT Terms:
  • Protective clothing
  • Breathing apparatus
  • Smoke
  • Vision
  • Peripheral vision
  • Depth perception
  • Light transmission
  • Haze
  • Distortion (Optics)
  • Curvature
  More +
• Publication/ Report Number:
  FAA-AM-78-41 ; DOT/FAA/AM-78/41
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Civil Aerospace Medical Institute
• 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-38169(USAF). ; 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.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/21151/dot_21151_DS1.pdf
• File Type:
  [PDF - 544.35 KB]
• Collection(s):
  FAA Civil Aerospace Medical Institute ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:11c8185dd39e5f91c56d0b33d25f15a9bbb0ed0ded7f5972991b2f690711a59093e213d85739e96ba0ef51b023faeba151b2e84ae02583d79ebd2b6112974d96