布里尔

(重定向自Bril (unit)

布里尔(bril)是一个心理物理学上的亮度单位。

布里尔定义为在亮度一微朗伯的区域,适应黑暗的眼睛可以接受到的亮度[1][2][注 1]

人感受到的亮度和物体表面的亮度不是成正比,像古斯塔夫·费希纳提出的韦伯-费希纳定理斯坦利·史密斯·史蒂文斯英语Stanley Smith Stevens提出的斯蒂文斯幂律英语Stevens' power law一様。

因为眼睛在不同的亮度会调整其对光的灵敏度,进行部分的补偿。因此感受到的亮度会和眼睛光适应英语Adaptation (eye)有关。

  • 适应100微朗伯的眼睛接受到照度100微朗伯的光,感受到的亮度会是3布里尔[3]
  • 适应1朗伯的眼睛,接受到照度0.01朗伯(10000朗伯)的光,感受到的亮度也会是3布里尔[3]

参考资料

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  1. ^ J.C. Stevens, L.E. Marks: Stevens’s Power Law in Vision: Exponents, Intercepts, and Thresholds. In: Fechner Day 99: Proceedings of the Fifteenth Annual Meeting of the International Society for Psychophysics. 1999, S. 82–87 (online页面存档备份,存于互联网档案馆)): „One bril is the brightness produced by 40 dB re 10-10 lambert [0.003 cd/m2] in a dark-adapted eye.“ (d. h. die 1 Bril verursachende Leuchtdichte liegt um einen Faktor 10000 (40 dB) über der Referenzleuchtdichte 10−10 Lambert)
  2. ^ G. van den Brink: Subjective Brightness during Dark-Adaptation. In: Vision Research. 2, Nr. 12, 1962, S. 495–502, doi:10.1016/0042-6989(62)90051-2: „A bril is defined as the brightness seen by a dark-adapted observer when he views a luminance of 40 decibels (dB).“
  3. ^ 3.0 3.1 J.C. Stevens, L.E. Marks: Stevens’s Power Law in Vision: Exponents, Intercepts, and Thresholds. In: Fechner Day 99: Proceedings of the Fifteenth Annual Meeting of the International Society for Psychophysics. 1999, S. 82–87, Fig. 1 (online).

脚注

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  1. ^ 1微朗伯 = 1/(100 π) cd/m2 ≈ 0.003 cd/m2

相关条目

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