介质的吸收对掠射法测量折射率的影响

Influence of Medium Absorption on Refractive Index Measured by Grazing Method

通过研究光经过棱形吸收介质后的出射角,可以获得掠射过程中出射角与入射角、复折射率实部和虚部的关系。通过数值模拟计算可知,当棱镜顶角和折射率一定以及虚部越大时,吸收棱镜与透明棱镜的出射角之差越大,对反演计算出的折射率的影响也越大;当顶角为π/3以及吸收虚部分别为0.20、0.10和0.01时,计算出折射率的最大相对误差分别约为5.0%、2.5%和0.2%;当虚部一定时,在较小的出射角的情况下,大顶角棱镜所产生的误差较小,在大出射角的情况下,小顶角棱镜产生的误差较小。

By studying the exit angle of light after passing through the prismatic absorbing medium,the relationship between among the exit angle,the incident angle,the real and imaginary parts of the complex refractive index in the glancing process can be obtained.Numerical simulation calculations show that when the apex angle and refractive index of the prism are constant and the imaginary part is larger,the greater the difference between the exit angle of the absorbing prism and the transparent prism,the greater the influence on the refractive index calculated by the inversion.When the apex angle isπ/3 and the absorption imaginary part is 0.20,0.10,and 0.01,the maximum relative errors of the calculated refractive index are about 5.0%,2.5%,and 0.2%,respectively.When the imaginary part is constant,the smaller the output in the case of a large angle,the error caused by a prism with a large apex angle is small,and in the case of a large exit angle,the error caused by a prism with a small apex angle is small.