JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
Subjective Appraisal and the Index of Flicker Sensation from Light Sources with Alternating Different Waves (Part 2)
The Analysis with Fourier Expansion
Yoshihiko TabuchiHajimu NakamuraTetsuya Kimoto
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JOURNAL FREE ACCESS

1987 Volume 71 Issue 10 Pages 599-604

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Abstract

In the former paper (1985), “Flicker Luminance Ratio” (FLR), which is a ratio of two such average luminances of alternating light waves that is divided the respective wave duration, was proposed and confirmed to be most adequate as the index of sensation for such flicker waves that is induced at both end parts of a fluorescent lamp.
The alternate different light waves are also periodic waves and the analysis with Fourier expansion can be applied for them.
Then, the amplitudes and the amplitude modulation degrees comprised of fundamental wave, second and third harmonics wave were compared each other in terms of the correlation to actual subjective appraisal data.
Furthermore those data of amplitudes and amplitude modulation degrees were compared with the above mentioned FLR.
Results are as follows.
(1) Among them, the amplitude of fundamental waves and the amplitude modulation degree of them have practically suffcient suitability.
(2) FLR has higher correlation with subjective appraisal than above two.
FLR is confirmed to have practically sufficient suitability as the index for flicker sensation from alternate different light waves in peripheral visual field.

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© The Illuminating Engineering Institute of Japan
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