Accession Number : AD0715168

Title :   Prediction of Signal Phantom from Laboratory Measurements,

Corporate Author : DEFENCE STANDARDS LABS MARIBYRNONG (AUSTRALIA)

Personal Author(s) : Clark,B. A. J.

Report Date : 1969

Pagination or Media Count : 14

Abstract : It is shown that 'phantom' intensities in traffic control signals can be successfully predicted from laboratory measurements. An artificial 'Sun' is used to illuminate the signal head and the intensity ratio of coloured to white sun phantom is measured. The white phantom found in practice can be calculated from the known luminance of the Sun and from the signal refractor geometry, so that the coloured phantom intensity can then be calculated. Actual peak phantom intensities are comparable with the intensities of genuine signal indications in practice, and some comments are made on methods for the control of signal phantom. (Author)

Descriptors :   (*SIGNAL LIGHTS, VISUAL ACUITY), OPTICAL PHENOMENA, REFLECTIVITY, SOLAR RADIATION, LUMINESCENCE, SAFETY, AUSTRALIA

Subject Categories : Civil Engineering
      Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE