光电子快报(英文版), 2019, 15 (2): 108, Published Online: Apr. 16, 2019  

An improved differential algorithm for the critical-anglerefractometer

Author Affiliations
1 Wuhan National Laboratory for Optoelectronics, Huazhong Institute of Electro-Optics, Wuhan 430223, China
2 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract
Due to the limit of the pixel size of the charge-coupled device (CCD) or complementary metal oxide semiconductor (CMOS) sensor, the traditional differential algorithm has a limited measuring accuracy by determining the critical an-gle in integral pixel. In this paper, we present a practical algorithm based on the centroid value of the reflective ratio around the critical angle pixel to address the traditional differential algorithm problem of determining the critical angle under sub-pixel in a critical angle refractometer (CAR). When the change of refractive index (RI) of a liquid sample is beyond the sensitivity of the traditional differential algorithm, the RI of the liquid can be obtained by using the cen-troid value of reflectivity around the critical angle pixel. The centroid value is associated with the RI change of the liq-uid in sub-pixel. Demonstrated by both theoretical analyses and experimental results using saline solutions with RI that changes in sub-pixel tested through the reflective CAR, the algorithm is found to be computationally effective and ro-bust to expand the measuring accuracy of the Abbe-type refractometer in sub-pixel.

YE Jun-wei, XIA Min, YANG Ke-cheng. An improved differential algorithm for the critical-anglerefractometer[J]. 光电子快报(英文版), 2019, 15(2): 108.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!