Effect of the light: dark ratio on the fusion frequency of flicker.
Effect of the light: dark ratio on the fusion frequency of flicker.
复制标题
明暗比对闪烁融合频率的影响。
DOI：
10.1152/jappl.1951.4.3.188
复制
发表时间：
1951
影响因子：
3.3
通讯作者：
E. Simonson
中科院分区：
文献类型：
--
作者：
P. Winchell;E. Simonson
方法利用一种新研制的电子仪器（14）测量FFF，该仪器提供完美的方波形式的光刺激，用于闪烁频率、光暗比和亮度的变化。根据塔尔博特定律，由于明暗比的变化会影响亮度，因此通过改变亮度刻度盘来补偿由于明暗比的变化而引起的亮度变化。刻度盘的位置在不同明暗比下校准为几个恒定的亮度水平，闪烁率高于融合点。在本系列中，使用了30英尺朗伯的恒定亮度水平，在五种不同的光暗比下，用光间隔的长度占总周期的百分比表示：20%、39%、61%、90%和98%，这些百分比的测定误差为ho。百分之五。
METHOD The FFF was measured by means of a newly developed electronic apparatus (14)~ which provides, with a perfect square wave form of the light stimuli, for a variation of the flicker frequency, 1ight: dark ratio, and brightness. Since variation of the 1ight: dark ratio would affect the brightness according to Talbot’s law, the change in brightness due to changing the light: dark ratio was compensated by a change of the brightness dial. The dial positions were calibrated for several constant brightness levels at different 1ight: dark ratios, with flicker rates above the point of fusion. For the present series, a constant brightness level of 30 foot-lamberts was used at five different 1ight: dark ratios, expressed as the length of the light interval in percentage of the total cycle: 20 per cent, 39 per cent, 61 per cent, 90 per cent, and 98 per cent. The error of the determination of these percentages was in the order of ho. 5 per cent.