Zhang Jiwei, Di Jianglei, Li Ying, Xi Teli, Zhao Jianlin
Opt Express. 2015 Oct 19;23(21):27328-34. doi: 10.1364/OE.23.027328.
We present a method for dynamically measuring the refractive index distribution in a large range based on the combination of digital holographic interferometry and total internal reflection. A series of holograms, carrying the index information of mixed liquids adhered on a total reflection prism surface, are recorded with CCD during the diffusion process. Phase shift differences of the reflected light are reconstructed exploiting the principle of double-exposure holographic interferometry. According to the relationship between the reflection phase shift difference and the liquid index, two dimensional index distributions can be directly figured out, assuming that the index of air near the prism surface is constant. The proposed method can also be applied to measure the index of solid media and monitor the index variation during some chemical reaction processes.
我们提出了一种基于数字全息干涉术与全内反射相结合的方法，用于大范围动态测量折射率分布。在扩散过程中，用电荷耦合器件（CCD）记录一系列承载附着在全反射棱镜表面混合液体折射率信息的全息图。利用双曝光全息干涉术原理重建反射光的相移差。根据反射相移差与液体折射率之间的关系，假设棱镜表面附近空气的折射率恒定，就可以直接得出二维折射率分布。该方法还可用于测量固体介质的折射率，并监测某些化学反应过程中的折射率变化。
