A PROCEDURE FOR THE PHOTOMETRIC DETERMINATION OF HEADLAMP AIM BY ISOLUX CONTOUR MATCHING

This report discusses the intensity map for a headlamp and the illumination map on the vertical plane constructed from the isocandela data and outlines a procedure for determining the headlamp aim by means of these two maps. The measurement procedure for the isocandela data is described, with a discussion of the correction of certain errors present in the data. A brief note is made concerning the various computer programs which perform the mapping and plotting functions; the laboratory set-up of the test vehicle or cart and the screen on which the check map is displayed is described. The question of the headlamp aim is discussed in relation to the vertical mapping plane. Finally, the procedure for finding the headlamp aim is discussed, illustrated by the treatment of a sample headlamp. /TRRL/

• Corporate Authors:

  NATIONAL AERONAUTICAL ESTABLISHMENT

  OTTAWA,   Canada 
• Authors:
  • Harrison, Al
• Publication Date: 1974-8-1

Media Info

• Features: Figures; References; Tables;
• Pagination: 49 p.

Subject/Index Terms

• TRT Terms: Computer programs; Digital computers; Errors; Headlamps; Measurement; Measuring instruments; Photometry
• Uncontrolled Terms: Bumps; Headlamp settings; Intensity
• Old TRIS Terms: Plotting
• ITRD Terms: 6155: Apparatus (measuring); 8673: Digital computer; 6440: Error; 1342: Headlamp; 1341: Headlamp setting; 6941: Intensity (current); 6136: Measurement; 6761: Photometry
• Subject Areas: Highways; Safety and Human Factors; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 00097699
• Record Type: Publication
• Source Agency: Road Safety Study and Research Fund, Belgium
• Report/Paper Numbers: LTR-ST. 720 R&D Rpt.
• Files: ITRD, TRIS
• Created Date: Sep 30 1975 12:00AM