It is necessary to clarify the appearance of light intensity variation for an automatic control of aeronautical ground lights. The authors carried out an experiment on the observation of point source varying in ramps slowly in order to obtain the relations between the light intensity variation thresholds and the background luminance, the variation speed, etc.
The results are follows:
(1) As the background luminance increaces, the intensity variation rate I/I
0 at the intensity variation threshold decreases when the light intensity varies to higher side, and the I/I
0 increases when the light intensity varies to lower side. The trend is notable when the light intensity varies to higher side.
(2) The intensity variation value at the threshold increases as the variation time increaces. The trend is notable when the light intensity varies to higher side. The discrimination of light intensity variation is independent of the variation time which is less than 1 sec.
(3) The intensity variation threshold on the dynamic observation is larger than that on the static observation.
(4) 12 intensity setting taps are required when the variation time is 1 sec, and 10 taps are required when the time is 5sec so that the intensity variation may not badly affect the pilots.
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