shixc 发表于 2005-8-24 19:17:00

回复：（ctshlisj）MIL标准中表面光洁度的单位

s的数值与划痕宽度没有简单的对应关系，比较接近的应是0.1微米，而不是1微米，还与小的划痕数量和划痕长度有关，8楼的比较接近。
According to the U.S. Military, who defined this spec:

"Scratches and Digs are defined by the U.S. Military Specification for the Inspection of Optical Components, MIL-O-13830A. Scratch numbers are essentially defined by the width of a scratch in 1/10,000 mm. However lengths of scratches and combinations of smaller scratches also contribute to the scratch number. Dig numbers are defined by the actual diameter of a dig in 1/100 mm. Smaller digs and irregularly shaped digs also affect the dig number. Both scratch and dig numbers are defined within certain areas of an optic and are defined differently for optical components by the MIL-Spec. The specification is denoted by the scratch number followed by the dig number."
80-50 Commonly acceptable cosmetic standard
60-40 Good commercial surface
40-20 Starting to be a true optical surface
20-10 High quality non-laser surface
10-10 Suitable for demanding laser applications.
So, in terms of microns, scratch widths are as follows:
80 scratch = 8 microns width
60 scratch = 6 microns width
40 scratch = 4 microns width
20 scratch = 2 microns width
10 scratch = 1 microns width
And digs are:
50 dig = 0.5mm diameter
40 dig = 0.45mm diameter
20 dig = 0.2mm diameter
10 dig = 0.1mm diameter

jona123 发表于 2005-8-26 00:28:00

同意楼上的定义,但要注意在美军标中这定义是针对直径为2.0MM的,对于小器件有必要根据面积进行换算.

huanggf1984 发表于 2005-12-2 02:34:00

<P> 学习中,看看标准去罗</P>
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chengjie 发表于 2009-12-29 22:26:03

第一位是擦痕号，是指最大的宽度，单位为微米（如60就是最大宽度为0.06mm）。第二位为麻点的最大直径要求， ...
touchsky 发表于 2004-8-28 00:35 static/image/common/back.gif


   同意，最大宽度为0.06mm，最大直径为0.40mm再参照标准版比对。

reggie5500 发表于 2010-9-25 15:04:20

好帖子！！！！！！！！！！！！！！！！！！！！！！！！！！！

rexchenjj 发表于 2011-11-11 16:50:51

60/40相当于4级表面光洁度
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