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[光度] 关于ASTM D1500的翻译问题

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发表于 2017-6-15 20:12:17 | 显示全部楼层 |阅读模式

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附件A1当中有几段关于比色计的要求,愣是没看懂,了解的大佬麻烦给我这个菜鸟解答下~谢谢~~~~~
首先是第一段:A three-field instrument shall show three illuminated areas in the field of view. Two areas shall be filled with light transmitted by two different color standards, and these shall be disposed symmetrically about the third area which shall be filled with light transmitted by the sample. The rectangular dimensions of each of the three areas shall be the same, and the left- and right-hand corners of the full field of view shall be rounded with radius not exceeding half the vertical dimension. The illuminated areas shall be separated in a horizontal direction by vertical lines so that the closest portion of the sample area and any one of the color standards illuminated areas subtends the eye of the observer not less than 0.3° nor more than 0.6°.
问题:这里面提到的0.3°~0.6°的范围,指的到底是使用者的眼睛到哪个位置的角度?是到视场的边缘,还是视场的中心?
第二段:Each illuminated area in the two-field instrument shall cover a circle of diameter subtending at least 2.2° and may be enlarged to any size provided that no two illuminated points in the field of view are separated by a distance subtending more than 10°. In the case of the three-field direct
viewing instrument, the subtending angles become 2.6° and 6.4°, respectively.
问题:这一段是真的一头雾水,第一句就怎么都想不通什么意思?
第三段:The angle subtended by a line of length d, in a plane perpendicular to the line of sight, and separated from the eye of the observer by a distance D, is given in degrees by 57.3 d/D. The angle subtended by the image of this line, seen by viewing it through an eyepiece of magnification M, is given in degrees by 57.3 Md/Di, where Di is the distance between the eye of the observer and the plane of the image.
问题:这一段里提到了57.3 d/D和57.3 Md/Di,既然附件A1是对D1500测量方法中使用的比色计作出了要求,那么这里我的理解是d/D的值应该等于57.3,同样的,Md/Di也要等于57.3,不知道这么理解对不对?另外,对于这一段里提到的d/D/Di这三个参数,我也理解得不到位,望解答!
最后,向大佬低头,有大佬出来给新手解答一下吗?看在我出生到现在发的最长的一个帖子的面子上~~~最后,附上D1500-2007的文档和找到的部分翻译。

ASTM_D1500-2007石油产品色度测定(astm 色度).pdf

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D1500石油产品色度中文翻译.doc

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