Problem Of Simulating Daylight For The Illumination Of Fluorescent Materials

Rona A. McKinnon; F. J. J. Clarke

doi:10.1117/12.959720

19 February 1982 Problem Of Simulating Daylight For The Illumination Of Fluorescent Materials

Rona A. McKinnon, F. J. J. Clarke

Proceedings Volume 0262, Light Measurement '81; (1982) https://doi.org/10.1117/12.959720
Event: Light Measurement '81, 1981, Surrey, United Kingdom

Abstract

The difficulties encountered in simulating accurately CIE Standard Illuminant D6, representing average daylight, particularly in the ultraviolet region, are considered. Accurate simulation is needed for colour measurements using colorimeters and for spectro-photometric measurements on fluorescent samples using polychromatic illumination. The ultraviolet content of a simulator can only affect the colour of a fluorescent material and the two main classes of such materials are considered in terms of how critical the ultra-violet content is. Samples were polychromatically illuminated with approximate simulations of CIE Standard Illuminants D65 and C and spectral total radiance factors measured. These results were corrected to represent the spectral total radiance factors that would be produced for ideal illuminants, by using additional quantities (true spectral reflectance and the emission and excitation spectra) determined from measurements on the samples by the NPL Spectrofluorimeter. The colour specifications of the samples were computed using the corrected spectral total radiance factors and indicate that Illuminant C was an adequate substitute for D65, for a sample representative of fluorescent signal and safety colours. An illuminant with an ultraviolet content similar to interior daylight, daylight attenuated by average window glass, was sufficient to produce an effect similar to that for D65 for a fluorescent white sample. Such a reduction in requirements for the shortest wavelengths present in a daylight simulator would allow the reproduction of the visible region to be imoroved and cheap, reliable simulators to be produced, without reducing the accuracy with which the colour specification of a fluorescent material can be measured.

Citation Download Citation

Rona A. McKinnon and F. J. J. Clarke "Problem Of Simulating Daylight For The Illumination Of Fluorescent Materials", Proc. SPIE 0262, Light Measurement '81, (19 February 1982); https://doi.org/10.1117/12.959720

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available