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[求助] 根据这篇文献里的描述,怎么精确的测量polymer film的厚度?

A series of copper spacers (Longmei Copper Foil Co.,Nanjing, China) with thicknesses ranging from 1 to100 lm were used as a mold. However, the thicknesses
of the films obtained were a little higher than the theoretical value. So a focusing ring of an optical microscope was used to measure the precise thickness of the polymer films.

他们的意思是把一个铜垫片放在两个玻璃片之间作为模具,具体的厚度是怎么测量的?a focusing ring of an optical microscope 是光学显微镜调焦环的意思吗?用这玩意怎么测厚度?

文章:Cracking in Poly(trimethylene terephthalate) Spherulites
DOI 10.1002/app.29138
Published online 30 October 2008 in Wiley InterScience (www.interscience.wiley.com).
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