P31 phosphor persistence at photopic mean luminance level
P31 phosphor persistence at photopic mean luminance level
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DOI：
10.1163/156856897x00249
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发表时间：
1997-01-01
期刊：
影响因子：
--
通讯作者：
Deubel, H
中科院分区：
文献类型：
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作者：
Wolf, W;Deubel, H
P31荧光屏经常用于点和光栅图案的短期呈现，但是用这种技术获得的实验数据受到了批评，因为磷光体持久性对受试者的视觉表现可能产生寄生效应。最近，这个问题在视觉研究中引起了有争议的讨论（Groner等人，1993; Westheimer，1993，1994;欧文，1994; Di Lollo等人，1994），其关注点图案的P31屏幕的余辉效应。补充这一讨论，目前的工作涉及不同类型的图案（点图案与光栅）和背景平均亮度水平（暗视与适光）对磷光体持久性的影响。使用具有高时间分辨率的极线性光度计，获得了平均亮度为20艾德m（-2）（即明视范围）的光栅图案发生的P31持久性的物理测量。在这种明视条件下，测量表明残留光栅对比度的快速衰减到其原始值的1.4%，在图案偏移后的50 ms内。在设计使用P31屏幕的实验时，必须考虑这种磷光体行为，尽管它在许多应用中肯定没有问题。
P31 phosphor screens are frequently used for short-term presentation of dot and grating patterns, but experimental data obtained with this technique have been criticized because of possible parasitic effects of phosphor persistence on subjects' visual performance. Recently, this issue provoked a controversial discussion in Vision Research (Groner et al., 1993; Westheimer, 1993, 1994; Irwin, 1994; Di Lollo et al., 1994) which was concerned with persistence effects of P31 screens for dot patterns. Supplementing this discussion, the present work deals with the effects of different types of patterns (dot pattern vs. gratings) and background mean-luminance levels (scotopic vs. phototopic) on phosphor persistence. Physical measurements of P31 persistence occurring with grating patterns of a mean luminance of 20 ed m(-2) (i.e. photopic range) were obtained by using an extremely linear photometer with high temporal resolution. Under this photopic condition, the measurements demonstrate a fast decay of residual grating contrast to 1.4% of its original value within 50 ms after pattern offset. This phosphor behavior must be considered when designing an experiment with a P31 screen though it certainly embodies no problems in many applications.