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北京石油化工学院2026年研究生招生接收调剂公告
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SPRINTL

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[求助] 请问红外reflectance和absorbance的区别,以及如何转化,十分感谢!

侧红外时纵坐标意义不太理解,求教!谢谢!
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ILOVEMYJOB
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hookhans

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那就百度或google, 或虫虫,你都能找到。 不要仅仅局限于课本知识。
where-there-is-a-will-there-is-a-way.
3楼2013-04-27 11:22:36
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hookhans

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感谢参与,应助指数 +1
SPRINTL: 金币+1, 有帮助, 仪器分析上只有T与A的转换,没找到R与A的转换啊 2013-04-27 11:19:52
这些基本理论, 应该教科书上都有。
where-there-is-a-will-there-is-a-way.
2楼2013-04-27 10:40:31
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readytogo

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瓜帅-催化剂

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★ ★ ★ ★ ★
感谢参与,应助指数 +1
王晓萌: 金币+2, 谢谢分享! 2013-04-27 22:40:20
SPRINTL: 金币+3, ★★★很有帮助 2013-04-28 15:44:47
Reflectance与Reflectance factor:

Reflectance/transmittance is the ratio of the reflected/transmitted radiant flux to the incident flux (measured in watts). Similarly to the phenomena one distinguishes between regular and diffuse reflectance/transmittance. The usual symbol is the Greek letter ρ for
reflectance and τ for transmittance.

     Reflectance factor is a quantity that has to be distinguished from reflectance. It is defined as the ratio of the radiant flux reflected in the direction delimited by a given cone (see Figure3 - 9), to the reflected radiant flux reflected in the same directions by a perfect reflecting diffuser identically irradiated. Its usual symbol is R.
     The angular distribution of the irradiation and the cone of observation have to be defined to be able to compare results taken with different instruments. The reflectance factor will approximate the reflectance as the observation cone approaches 2π sr (steradian). On the
other hand for regularly reflecting surfaces that are irradiated by a beam of small solid angle,the reflectance factor may be much larger than 1 if the cone includes the mirror image of the source.
      If the cone delimiting the reflected radiant flux in the definition of the reflectance factor is negligibly small we get the radiance factor, where the reflected radiance of the surface is compared to the radiance of the equally irradiated perfect reflecting diffuser. It is usual to use
the symbol β to describe the radiance factor.

Above are the most important quantities used in describing the colorimetric characteristics of materials, for further details please consult the Glossary or the relevant CIE publications
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4楼2013-04-27 22:16:15
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SPRINTL

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引用回帖:
4楼: Originally posted by readytogo at 2013-04-27 22:16:15
Reflectance与Reflectance factor:

Reflectance/transmittance is the ratio of the reflected/transmitted radiant flux to the incident flux (measured in watts). Similarly to the phenomena one distingu ...

那么请问文献上看到的红外纵坐标都为absorbance,而我用漫反射测出来经过k-M转换后纵坐标为K-M,那么我可以认为K-M的纵坐标和A值相等吗
ILOVEMYJOB
5楼2013-04-28 15:46:14
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