VISUAL TRANSMITTANCE METER FOR THE ATMOSPHERE IN VEHICULAR TUNNELS

Ventilation and lighting systems installed in vehicular tunnels should be designed and operated on the basis of the visual transmittance of the atmosphere polluted by soot and smoke in these tunnels so as to permit the driver to perceive all the relevant visual information for safe driving. For the purpose of developing a transmittance meter for tunnels, the authors determined the condition needed for the spectral characteristics of the light source and the photodetector of the meter, using the physical properties of soot and smoke and the spectral transmittance of the atmosphere in tunnels. Concerning the reliability of this meter, a method was developed to keep the lenses clean by a pipe which stops the flow of air near the surface of the lenses, and a method of calibrating the meter by electric circuits which corrects the output automatically. Making use of these results, the authors designed and manufactured the VI meter to measure the transmittance of atmosphere in tunnels and to control the ventilation system.

  • Corporate Authors:

    Matsushita Electrical Company, Limited

    3-15 Yakumonakamachi Moriguchi
    Osaka 571,   Japan 
  • Authors:
    • Koyama, K
    • Ishida, M
    • Tanaka, H
    • SAKAMOTO, S
  • Publication Date: 1977-8

Language

  • Japanese

Media Info

  • Features: References;
  • Pagination: p. 649-658
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00176608
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jul 29 1978 12:00AM