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The Forel-Ule scale revisited spectrally: preparation protocol, transmission measurements and chromaticity
Novoa, S.; Wernand, M.R.; van der Woerd, H.J. (2013). The Forel-Ule scale revisited spectrally: preparation protocol, transmission measurements and chromaticity. JEOS: RP 8: 13057 1-8. dx.doi.org/10.2971/jeos.2013.13057
In: Journal of the European Optical Society: Rapid Publications. European Optical Society: Hannover. ISSN 1990-2573, more
Peer reviewed article  

Available in Authors 

Author keywords
    Forel-Ule; colour of water; chromaticity; spectral transmission; opticalproperties

Authors  Top 
  • Novoa, S., more
  • Wernand, M.R., more
  • van der Woerd, H.J.

Abstract
    Within the EC-funded project CITLOPS (Citizens' Observatory for Coast and Ocean Optical Monitoring), with its main goal to empower endusers, willing to employ community-based environmental monitoring, our aim is to digitalize the colours of the Forel-Ule scale to establish the colour of natural waters through smartphone imaging. The objective of this study was to reproduce the Forel-Ule scale following the original recipes, measure the transmission of the solutions and calculate the chromaticity coordinates of the scale as Wernand and Van der Woerd did in 2010, for the future development of a smartphone application. Some difficulties were encountered when producing the scale, so a protocol for its consistent reproduction was developed and is described in this study. Recalculated chromaticity coordinates are presented and compared to measurements conducted by former scientists. An error analysis of the spectral and colourimetric information shows negligible experimental errors.

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