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4 April 1979 Photometry And Colour Measurements Of Ships Navigation Lights
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Proceedings Volume 0146, Light Measurement in Industry; (1979) https://doi.org/10.1117/12.956606
Event: Light Measurement in Industry I, 1978, London, United Kingdom
Abstract
As a result of the 1972 International conference on the 'Prevention of Collisions at Sea', the Department of the Environment was requested to conduct tests on navigation lanterns to enable the Department of Trade (Marine) to certify those which they considered complied with the agreed International Regulations. The development of a test programme and the presentation for the photometric and chromaticity measurements on these lanterns is discussed. The photometry is conducted on a remotely controlled goniometer. The lanterns are mounted on a dividing head table, with the geometric centre of the lens aligned to zero degrees in elevation. Intensity distribution values are recorded by means of a selenium photo voltaic cell/CIE filter combination and direct reading galvanometer. These values are then used to construct unique log-linear isocandela diagrams. The colours of the lights are measured on a modified Lovibond Schoffield Tintometer. Suitable amounts of permanent glass filters in either one or two of the three subtractive primaries, red, yellow or blue are introduced until a subjective colour match is achieved between the sample and reference fields. Readings are then converted to x, y, z co-ordinates and checked for compliance with the International Regulations.
© (1979) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. R. Rumsey "Photometry And Colour Measurements Of Ships Navigation Lights", Proc. SPIE 0146, Light Measurement in Industry, (4 April 1979); https://doi.org/10.1117/12.956606
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