英文翻译

It's a very important content of biomedical optical to study the characteristics of light propagation in biological tissue. The application of the research in medical has great theoretical and pratical significance. It cannot only detect the optical property parameters scathelessly but also generate image. Refractive index of biological tissue is one of the important optical property prameters. The accurace of this data concerns the foundation of many optical research on biological tissue.

According total reflection theory， this article overcome the strong scattering of biological tissue. A measuring instrument， which is constructed by white light source， fiber， lens， isosceles right-angle prism and spectrometer， is designed in this article. The incident angle A of white light entering right-angle prism and the refractive index N of prism were measured at critical state， then the refractive index of biological tissue can be calculated by formula.
The design of the experiment is to measure the wave length of red， green and blue light that white light scattered from prism. The calculated refractive index of biological tissue is same as the reference. The result proved that the measurement is valid. A new method is presented to further research the characteristics of light propagation in biological tissue.