[讨论]Internal Transmittance 怎么来的?
<P>抱歉不知道中文怎么译</P><P>找玻璃的时候总是看到它</P>
<P>虽然它是吸收系数的另一种表示方式.可是我想问它是测出来的还是算出来的?</P>
<P>如果是测出来的,怎么测?</P>
<P>如果是据 R+T+A=1 算出来的,那它一般用在什么场合?有什么明显意义?</P> <P>Internal transmittance, ti, is defined as the transmission through a filter glass after the initial reflection losses are accounted for by dividing external transmission, T, by the reflection factor Pd. <B>ti = T / Pd</B>Example:The external transmittance for a nominal 1.0 mm thick filter glass is given as T1.0 = 59.8 % at 330 nm. The reflection factor is given as Pd = 0.911. Find the external transmittance T2.2 for a filter that is 2.2 mm thick.
Solution:t1.0 = T1.0 / Pd = 0.598 / 0.911 = 0.656t2.2 = 2.2/1.0 = 2.2 = 0.396T2.2 = t2.2 * Pd = (0.396)(0.911) = 0.361<P>So, for a 2.2 mm thick filter, the external transmittance at 330 nm would be 36.1%
</P> thanks 计算公式？？？？
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