A Method for a Precise and Instantaneous Measurement of a Refractive Index
A Method for a Precise and Instantaneous Measurement of a Refractive Index
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DOI：
10.1109/tmech.2018.2840426
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
H. Nasibov;A. Kholmatov;I. Mehmetbeyli
中科院分区：
文献类型：
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作者：
H. Nasibov;A. Kholmatov;I. Mehmetbeyli
提出了一种基于机器视觉的非侵入式系统，用于测量平板材料和细胞内液体的折射率（RI）。该方法的原理是将介质折射率差引起的激光条纹位移传递到相应的折射率。所提出的方法的两个主要优点是，细胞内的液体的RI可以即时测量，而不知道任何的细胞壁的光学参数，分别。然而，其他可用的方法是基于两步测量（首先分别针对空的单元，然后针对填充的单元）过程。测量了几种研究良好的NaCl液体和水溶液的RI，并与相应的参考值进行了确认。由于能够以亚像素精度和强大的图像处理算法定位激光条纹位移，RI测量的精度高达10−4。对该方法的不确定度分量进行了深入分析，结果表明，根据相应的应用和预算，可以进一步提高精度。
A noninvasive machine vision-based system aimed at the measurement of a refractive index (RI) of slab materials and liquids inside a cell is presented. The principle of the proposed method is based on the relaying laser stripe displacements, which occur due to the difference of the refraction across mediums, to the corresponding RI. Two of the main advantages of the proposed method are that the RI of a liquid inside a cell can be measured instantaneously and without knowing any of the optical parameters of the cell walls, respectively. Other available methods however are based on a two-step measurement (first for an empty and then for the filled cell, respectively) procedure. The RI of several well-studied liquids and aqueous solutions of NaCl was measured and the results were confirmed with the corresponding reference values. The precision of up to 10−4 in RI measurement is achieved due to the ability of localizing laser stripe displacements with the subpixel accuracy and robust image processing algorithms. The uncertainty components of the proposed method are thoroughly analyzed, and it is shown that the precision can be further increased subject to the corresponding application and budget.